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Commit 048fc686 by Joe Buck Committed by Jeff Law
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gcc.texi: Use terms "GNU Compiler Collection" and "GCC". 

        * gcc.texi: Use terms "GNU Compiler Collection" and "GCC".
        Also update copyright.

From-SVN: r28359
parent b384405b
Showing with 250 additions and 241 deletions
gcc/ChangeLog
Thu Jul 31 12:34:45 1999 Joe Buck <jbuck@synopsys.com>
* gcc.texi: Use terms "GNU Compiler Collection" and "GCC".
Also update copyright.
Sat Jul 31 11:10:07 1999 Bernd Schmidt <bernds@cygnus.co.uk> Sat Jul 31 11:10:07 1999 Bernd Schmidt <bernds@cygnus.co.uk>
* c-pragma.c: Don't include "except.h". * c-pragma.c: Don't include "except.h".
......
gcc/gcc.texi
...@@ -47,15 +47,15 @@ ...@@ -47,15 +47,15 @@
@ifset INTERNALS @ifset INTERNALS
@ifset USING @ifset USING
@settitle Using and Porting GNU CC @settitle Using and Porting the GNU Compiler Collection (GCC)
@end ifset @end ifset
@end ifset @end ifset
@c seems reasonable to assume at least one of INTERNALS or USING is set... @c seems reasonable to assume at least one of INTERNALS or USING is set...
@ifclear INTERNALS @ifclear INTERNALS
@settitle Using GNU CC @settitle Using the GNU Compiler Collection
@end ifclear @end ifclear
@ifclear USING @ifclear USING
@settitle Porting GNU CC @settitle Porting the GNU Compiler Collection
@end ifclear @end ifclear
@syncodeindex fn cp @syncodeindex fn cp
...@@ -82,7 +82,7 @@ ...@@ -82,7 +82,7 @@
@ifinfo @ifinfo
@dircategory Programming @dircategory Programming
@direntry @direntry
* gcc: (gcc). The GNU C compiler. * gcc: (gcc). The GNU Compiler Collection.
@end direntry @end direntry
@ifset INTERNALS @ifset INTERNALS
@ifset USING @ifset USING
...@@ -100,7 +100,7 @@ Published by the Free Software Foundation ...@@ -100,7 +100,7 @@ Published by the Free Software Foundation
59 Temple Place - Suite 330 59 Temple Place - Suite 330
Boston, MA 02111-1307 USA Boston, MA 02111-1307 USA
Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc. Copyright (C) 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
Permission is granted to make and distribute verbatim copies of Permission is granted to make and distribute verbatim copies of
this manual provided the copyright notice and this permission notice this manual provided the copyright notice and this permission notice
...@@ -133,27 +133,27 @@ instead of in the original English. ...@@ -133,27 +133,27 @@ instead of in the original English.
@titlepage @titlepage
@ifset INTERNALS @ifset INTERNALS
@ifset USING @ifset USING
@center @titlefont{Using and Porting GNU CC} @center @titlefont{Using and Porting the GNU Compiler Collection}
@end ifset @end ifset
@end ifset @end ifset
@ifclear INTERNALS @ifclear INTERNALS
@title Using GNU CC @title Using the GNU Compiler Collection
@end ifclear @end ifclear
@ifclear USING @ifclear USING
@title Porting GNU CC @title Porting the GNU Compiler Collection
@end ifclear @end ifclear
@sp 2 @sp 2
@center Richard M. Stallman @center Richard M. Stallman
@sp 3 @sp 3
@center Last updated 16 March 1998 @center Last updated 28 July 1999
@sp 1 @sp 1
@c The version number appears five times more in this file. @c The version number appears five times more in this file.
@center for gcc-2.96 @center for gcc-2.96
@page @page
@vskip 0pt plus 1filll @vskip 0pt plus 1filll
Copyright @copyright{} 1988, 89, 92, 93, 94, 95, 96, 98 Free Software Foundation, Inc. Copyright @copyright{} 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1998, 1999 Free Software Foundation, Inc.
@sp 2 @sp 2
For GCC Version 2.96@* For GCC Version 2.96@*
@sp 1 @sp 1
...@@ -214,19 +214,19 @@ bugs. It corresponds to GCC version 2.96. ...@@ -214,19 +214,19 @@ bugs. It corresponds to GCC version 2.96.
@ifset USING @ifset USING
* G++ and GCC:: You can compile C or C++ programs. * G++ and GCC:: You can compile C or C++ programs.
* Invoking GCC:: Command options supported by @samp{gcc}. * Invoking GCC:: Command options supported by @samp{gcc}.
* Installation:: How to configure, compile and install GNU CC. * Installation:: How to configure, compile and install GCC.
* C Extensions:: GNU extensions to the C language family. * C Extensions:: GNU extensions to the C language family.
* C++ Extensions:: GNU extensions to the C++ language. * C++ Extensions:: GNU extensions to the C++ language.
* Gcov:: gcov: a GNU CC test coverage program. * Gcov:: gcov: a GCC test coverage program.
* Trouble:: If you have trouble installing GNU CC. * Trouble:: If you have trouble installing GCC.
* Bugs:: How, why and where to report bugs. * Bugs:: How, why and where to report bugs.
* Service:: How to find suppliers of support for GNU CC. * Service:: How to find suppliers of support for GCC.
* Contributing:: How to contribute to testing and developing GNU CC. * Contributing:: How to contribute to testing and developing GCC.
* VMS:: Using GNU CC on VMS. * VMS:: Using GCC on VMS.
@end ifset @end ifset
@ifset INTERNALS @ifset INTERNALS
* Portability:: Goals of GNU CC's portability features. * Portability:: Goals of GCC's portability features.
* Interface:: Function-call interface of GNU CC output. * Interface:: Function-call interface of GCC output.
* Passes:: Order of passes, what they do, and what each file is for. * Passes:: Order of passes, what they do, and what each file is for.
* RTL:: The intermediate representation that most passes work on. * RTL:: The intermediate representation that most passes work on.
* Machine Desc:: How to write machine description instruction patterns. * Machine Desc:: How to write machine description instruction patterns.
...@@ -239,24 +239,27 @@ bugs. It corresponds to GCC version 2.96. ...@@ -239,24 +239,27 @@ bugs. It corresponds to GCC version 2.96.
* GNU/Linux:: Linux and the GNU Project * GNU/Linux:: Linux and the GNU Project
* Copying:: GNU General Public License says * Copying:: GNU General Public License says
how you can copy and share GNU CC. how you can copy and share GCC.
* Contributors:: People who have contributed to GNU CC. * Contributors:: People who have contributed to GCC.
* Index:: Index of concepts and symbol names. * Index:: Index of concepts and symbol names.
@end menu @end menu
@ifset USING @ifset USING
@node G++ and GCC @node G++ and GCC
@chapter Compile C, C++, or Objective C @chapter Compile C, C++, Objective C, or Fortran
@cindex Objective C @cindex Objective C
The C, C++, and Objective C versions of the compiler are integrated; the The C, C++, and Objective C, and Fortran versions of the compiler are
GNU C compiler can compile programs written in C, C++, or Objective C. integrated; this is why we use the name ``GNU Compiler Collection''.
GCC can compile programs written in C, C++, Objective C, or Fortran.
The Fortran compiler is described in a separate manual.
@cindex GCC @cindex GCC
``GCC'' is a common shorthand term for the GNU C compiler. This is both ``GCC'' is a common shorthand term for the GNU Compiler Collection. This is both
the most general name for the compiler, and the name used when the the most general name for the compiler, and the name used when the
emphasis is on compiling C programs. emphasis is on compiling C programs (as the abbreviation formerly
stood for ``GNU C Compiler'').
@cindex C++ @cindex C++
@cindex G++ @cindex G++
...@@ -265,20 +268,20 @@ When referring to C++ compilation, it is usual to call the compiler ...@@ -265,20 +268,20 @@ When referring to C++ compilation, it is usual to call the compiler
it ``GCC'' no matter what the language context; however, the term it ``GCC'' no matter what the language context; however, the term
``G++'' is more useful when the emphasis is on compiling C++ programs. ``G++'' is more useful when the emphasis is on compiling C++ programs.
We use the name ``GNU CC'' to refer to the compilation system as a We use the name ``GCC'' to refer to the compilation system as a
whole, and more specifically to the language-independent part of the whole, and more specifically to the language-independent part of the
compiler. For example, we refer to the optimization options as compiler. For example, we refer to the optimization options as
affecting the behavior of ``GNU CC'' or sometimes just ``the compiler''. affecting the behavior of ``GCC'' or sometimes just ``the compiler''.
Front ends for other languages, such as Ada 9X, Fortran, Modula-3, and Front ends for other languages, such as Ada 9X, Fortran, Modula-3, and
Pascal, are under development. These front-ends, like that for C++, are Pascal, are under development. These front-ends, like that for C++, are
built in subdirectories of GNU CC and link to it. The result is an built in subdirectories of GCC and link to it. The result is an
integrated compiler that can compile programs written in C, C++, integrated compiler that can compile programs written in C, C++,
Objective C, or any of the languages for which you have installed front Objective C, or any of the languages for which you have installed front
ends. ends.
In this manual, we only discuss the options for the C, Objective-C, and In this manual, we only discuss the options for the C, Objective-C, and
C++ compilers and those of the GNU CC core. Consult the documentation C++ compilers and those of the GCC core. Consult the documentation
of the other front ends for the options to use when compiling programs of the other front ends for the options to use when compiling programs
written in other languages. written in other languages.
...@@ -308,13 +311,13 @@ give you comprehensive C++ source-level editing capabilities ...@@ -308,13 +311,13 @@ give you comprehensive C++ source-level editing capabilities
@include gcov.texi @include gcov.texi
@node Trouble @node Trouble
@chapter Known Causes of Trouble with GNU CC @chapter Known Causes of Trouble with GCC
@cindex bugs, known @cindex bugs, known
@cindex installation trouble @cindex installation trouble
@cindex known causes of trouble @cindex known causes of trouble
This section describes known problems that affect users of GNU CC. Most This section describes known problems that affect users of GCC. Most
of these are not GNU CC bugs per se---if they were, we would fix them. of these are not GCC bugs per se---if they were, we would fix them.
But the result for a user may be like the result of a bug. But the result for a user may be like the result of a bug.
Some of these problems are due to bugs in other software, some are Some of these problems are due to bugs in other software, some are
...@@ -323,12 +326,12 @@ where people's opinions differ as to what is best. ...@@ -323,12 +326,12 @@ where people's opinions differ as to what is best.
@menu @menu
* Actual Bugs:: Bugs we will fix later. * Actual Bugs:: Bugs we will fix later.
* Installation Problems:: Problems that manifest when you install GNU CC. * Installation Problems:: Problems that manifest when you install GCC.
* Cross-Compiler Problems:: Common problems of cross compiling with GNU CC. * Cross-Compiler Problems:: Common problems of cross compiling with GCC.
* Interoperation:: Problems using GNU CC with other compilers, * Interoperation:: Problems using GCC with other compilers,
and with certain linkers, assemblers and debuggers. and with certain linkers, assemblers and debuggers.
* External Bugs:: Problems compiling certain programs. * External Bugs:: Problems compiling certain programs.
* Incompatibilities:: GNU CC is incompatible with traditional C. * Incompatibilities:: GCC is incompatible with traditional C.
* Fixed Headers:: GNU C uses corrected versions of system header files. * Fixed Headers:: GNU C uses corrected versions of system header files.
This is necessary, but doesn't always work smoothly. This is necessary, but doesn't always work smoothly.
* Standard Libraries:: GNU C uses the system C library, which might not be * Standard Libraries:: GNU C uses the system C library, which might not be
...@@ -363,7 +366,7 @@ There are several obscure case of mis-using struct, union, and ...@@ -363,7 +366,7 @@ There are several obscure case of mis-using struct, union, and
enum tags that are not detected as errors by the compiler. enum tags that are not detected as errors by the compiler.
@item @item
When @samp{-pedantic-errors} is specified, GNU C will incorrectly give When @samp{-pedantic-errors} is specified, GCC will incorrectly give
an error message when a function name is specified in an expression an error message when a function name is specified in an expression
involving the comma operator. involving the comma operator.
...@@ -393,19 +396,19 @@ directory. Make sure you have done all the necessary preparations. ...@@ -393,19 +396,19 @@ directory. Make sure you have done all the necessary preparations.
@xref{Other Dir}. @xref{Other Dir}.
@item @item
If you build GNU CC on a BSD system using a directory stored in a System If you build GCC on a BSD system using a directory stored in a System
V file system, problems may occur in running @code{fixincludes} if the V file system, problems may occur in running @code{fixincludes} if the
System V file system doesn't support symbolic links. These problems System V file system doesn't support symbolic links. These problems
result in a failure to fix the declaration of @code{size_t} in result in a failure to fix the declaration of @code{size_t} in
@file{sys/types.h}. If you find that @code{size_t} is a signed type and @file{sys/types.h}. If you find that @code{size_t} is a signed type and
that type mismatches occur, this could be the cause. that type mismatches occur, this could be the cause.
The solution is not to use such a directory for building GNU CC. The solution is not to use such a directory for building GCC.
@item @item
In previous versions of GNU CC, the @code{gcc} driver program looked for In previous versions of GCC, the @code{gcc} driver program looked for
@code{as} and @code{ld} in various places; for example, in files @code{as} and @code{ld} in various places; for example, in files
beginning with @file{/usr/local/lib/gcc-}. GNU CC version 2 looks for beginning with @file{/usr/local/lib/gcc-}. GCC version 2 looks for
them in the directory them in the directory
@file{/usr/local/lib/gcc-lib/@var{target}/@var{version}}. @file{/usr/local/lib/gcc-lib/@var{target}/@var{version}}.
...@@ -433,12 +436,12 @@ the compiler. In one case, this was traced down to a bug in ...@@ -433,12 +436,12 @@ the compiler. In one case, this was traced down to a bug in
@item @item
If you have installed a program known as purify, you may find that it If you have installed a program known as purify, you may find that it
causes errors while linking @code{enquire}, which is part of building causes errors while linking @code{enquire}, which is part of building
GNU CC. The fix is to get rid of the file @code{real-ld} which purify GCC. The fix is to get rid of the file @code{real-ld} which purify
installs---so that GNU CC won't try to use it. installs---so that GCC won't try to use it.
@item @item
On GNU/Linux SLS 1.01, there is a problem with @file{libc.a}: it does not On GNU/Linux SLS 1.01, there is a problem with @file{libc.a}: it does not
contain the obstack functions. However, GNU CC assumes that the obstack contain the obstack functions. However, GCC assumes that the obstack
functions are in @file{libc.a} when it is the GNU C library. To work functions are in @file{libc.a} when it is the GNU C library. To work
around this problem, change the @code{__GNU_LIBRARY__} conditional around this problem, change the @code{__GNU_LIBRARY__} conditional
around line 31 to @samp{#if 1}. around line 31 to @samp{#if 1}.
...@@ -447,7 +450,7 @@ around line 31 to @samp{#if 1}. ...@@ -447,7 +450,7 @@ around line 31 to @samp{#if 1}.
On some 386 systems, building the compiler never finishes because On some 386 systems, building the compiler never finishes because
@code{enquire} hangs due to a hardware problem in the motherboard---it @code{enquire} hangs due to a hardware problem in the motherboard---it
reports floating point exceptions to the kernel incorrectly. You can reports floating point exceptions to the kernel incorrectly. You can
install GNU CC except for @file{float.h} by patching out the command to install GCC except for @file{float.h} by patching out the command to
run @code{enquire}. You may also be able to fix the problem for real by run @code{enquire}. You may also be able to fix the problem for real by
getting a replacement motherboard. This problem was observed in getting a replacement motherboard. This problem was observed in
Revision E of the Micronics motherboard, and is fixed in Revision F. Revision E of the Micronics motherboard, and is fixed in Revision F.
...@@ -459,7 +462,7 @@ are running SCO Unix, you can reboot and force the FPU to be ignored. ...@@ -459,7 +462,7 @@ are running SCO Unix, you can reboot and force the FPU to be ignored.
To do this, type @samp{hd(40)unix auto ignorefpu}. To do this, type @samp{hd(40)unix auto ignorefpu}.
@item @item
On some 386 systems, GNU CC crashes trying to compile @file{enquire.c}. On some 386 systems, GCC crashes trying to compile @file{enquire.c}.
This happens on machines that don't have a 387 FPU chip. On 386 This happens on machines that don't have a 387 FPU chip. On 386
machines, the system kernel is supposed to emulate the 387 when you machines, the system kernel is supposed to emulate the 387 when you
don't have one. The crash is due to a bug in the emulator. don't have one. The crash is due to a bug in the emulator.
...@@ -490,48 +493,48 @@ enquire.c:2328: floating overflow ...@@ -490,48 +493,48 @@ enquire.c:2328: floating overflow
@end example @end example
@item @item
On SCO systems, when compiling GNU CC with the system's compiler, On SCO systems, when compiling GCC with the system's compiler,
do not use @samp{-O}. Some versions of the system's compiler miscompile do not use @samp{-O}. Some versions of the system's compiler miscompile
GNU CC with @samp{-O}. GCC with @samp{-O}.
@cindex @code{genflags}, crash on Sun 4 @cindex @code{genflags}, crash on Sun 4
@item @item
Sometimes on a Sun 4 you may observe a crash in the program Sometimes on a Sun 4 you may observe a crash in the program
@code{genflags} or @code{genoutput} while building GNU CC. This is said to @code{genflags} or @code{genoutput} while building GCC. This is said to
be due to a bug in @code{sh}. You can probably get around it by running be due to a bug in @code{sh}. You can probably get around it by running
@code{genflags} or @code{genoutput} manually and then retrying the @code{genflags} or @code{genoutput} manually and then retrying the
@code{make}. @code{make}.
@item @item
On Solaris 2, executables of GNU CC version 2.0.2 are commonly On Solaris 2, executables of GCC version 2.0.2 are commonly
available, but they have a bug that shows up when compiling current available, but they have a bug that shows up when compiling current
versions of GNU CC: undefined symbol errors occur during assembly if you versions of GCC: undefined symbol errors occur during assembly if you
use @samp{-g}. use @samp{-g}.
The solution is to compile the current version of GNU CC without The solution is to compile the current version of GCC without
@samp{-g}. That makes a working compiler which you can use to recompile @samp{-g}. That makes a working compiler which you can use to recompile
with @samp{-g}. with @samp{-g}.
@item @item
Solaris 2 comes with a number of optional OS packages. Some of these Solaris 2 comes with a number of optional OS packages. Some of these
packages are needed to use GNU CC fully. If you did not install all packages are needed to use GCC fully. If you did not install all
optional packages when installing Solaris, you will need to verify that optional packages when installing Solaris, you will need to verify that
the packages that GNU CC needs are installed. the packages that GCC needs are installed.
To check whether an optional package is installed, use To check whether an optional package is installed, use
the @code{pkginfo} command. To add an optional package, use the the @code{pkginfo} command. To add an optional package, use the
@code{pkgadd} command. For further details, see the Solaris @code{pkgadd} command. For further details, see the Solaris
documentation. documentation.
For Solaris 2.0 and 2.1, GNU CC needs six packages: @samp{SUNWarc}, For Solaris 2.0 and 2.1, GCC needs six packages: @samp{SUNWarc},
@samp{SUNWbtool}, @samp{SUNWesu}, @samp{SUNWhea}, @samp{SUNWlibm}, and @samp{SUNWbtool}, @samp{SUNWesu}, @samp{SUNWhea}, @samp{SUNWlibm}, and
@samp{SUNWtoo}. @samp{SUNWtoo}.
For Solaris 2.2, GNU CC needs an additional seventh package: @samp{SUNWsprot}. For Solaris 2.2, GCC needs an additional seventh package: @samp{SUNWsprot}.
@item @item
On Solaris 2, trying to use the linker and other tools in On Solaris 2, trying to use the linker and other tools in
@file{/usr/ucb} to install GNU CC has been observed to cause trouble. @file{/usr/ucb} to install GCC has been observed to cause trouble.
For example, the linker may hang indefinitely. The fix is to remove For example, the linker may hang indefinitely. The fix is to remove
@file{/usr/ucb} from your @code{PATH}. @file{/usr/ucb} from your @code{PATH}.
...@@ -555,7 +558,7 @@ optional, and there should not be a warning about their absence. ...@@ -555,7 +558,7 @@ optional, and there should not be a warning about their absence.
@item @item
In Ultrix 4.0 on the MIPS machine, @file{stdio.h} does not work with GNU In Ultrix 4.0 on the MIPS machine, @file{stdio.h} does not work with GNU
CC at all unless it has been fixed with @code{fixincludes}. This causes CC at all unless it has been fixed with @code{fixincludes}. This causes
problems in building GNU CC. Once GNU CC is installed, the problems go problems in building GCC. Once GCC is installed, the problems go
away. away.
To work around this problem, when making the stage 1 compiler, specify To work around this problem, when making the stage 1 compiler, specify
...@@ -585,7 +588,7 @@ Some versions of the MIPS linker will issue an assertion failure ...@@ -585,7 +588,7 @@ Some versions of the MIPS linker will issue an assertion failure
when linking code that uses @code{alloca} against shared when linking code that uses @code{alloca} against shared
libraries on RISC-OS 5.0, and DEC's OSF/1 systems. This is a bug libraries on RISC-OS 5.0, and DEC's OSF/1 systems. This is a bug
in the linker, that is supposed to be fixed in future revisions. in the linker, that is supposed to be fixed in future revisions.
To protect against this, GNU CC passes @samp{-non_shared} to the To protect against this, GCC passes @samp{-non_shared} to the
linker unless you pass an explicit @samp{-shared} or linker unless you pass an explicit @samp{-shared} or
@samp{-call_shared} switch. @samp{-call_shared} switch.
...@@ -618,7 +621,7 @@ On System V, if you get an error like this, ...@@ -618,7 +621,7 @@ On System V, if you get an error like this,
that too indicates a problem with disk space, ULIMIT, or @code{MAXUMEM}. that too indicates a problem with disk space, ULIMIT, or @code{MAXUMEM}.
@item @item
Current GNU CC versions probably do not work on version 2 of the NeXT Current GCC versions probably do not work on version 2 of the NeXT
operating system. operating system.
@item @item
...@@ -628,7 +631,7 @@ does not happen on 3.1. ...@@ -628,7 +631,7 @@ does not happen on 3.1.
@item @item
On the Tower models 4@var{n}0 and 6@var{n}0, by default a process is not On the Tower models 4@var{n}0 and 6@var{n}0, by default a process is not
allowed to have more than one megabyte of memory. GNU CC cannot compile allowed to have more than one megabyte of memory. GCC cannot compile
itself (or many other programs) with @samp{-O} in that much memory. itself (or many other programs) with @samp{-O} in that much memory.
To solve this problem, reconfigure the kernel adding the following line To solve this problem, reconfigure the kernel adding the following line
...@@ -640,7 +643,7 @@ MAXUMEM = 4096 ...@@ -640,7 +643,7 @@ MAXUMEM = 4096
@item @item
On HP 9000 series 300 or 400 running HP-UX release 8.0, there is a bug On HP 9000 series 300 or 400 running HP-UX release 8.0, there is a bug
in the assembler that must be fixed before GNU CC can be built. This in the assembler that must be fixed before GCC can be built. This
bug manifests itself during the first stage of compilation, while bug manifests itself during the first stage of compilation, while
building @file{libgcc2.a}: building @file{libgcc2.a}:
...@@ -677,13 +680,13 @@ use BASH (the GNU shell) to run @code{fixproto}. ...@@ -677,13 +680,13 @@ use BASH (the GNU shell) to run @code{fixproto}.
@item @item
Some versions of the Pyramid C compiler are reported to be unable to Some versions of the Pyramid C compiler are reported to be unable to
compile GNU CC. You must use an older version of GNU CC for compile GCC. You must use an older version of GCC for
bootstrapping. One indication of this problem is if you get a crash bootstrapping. One indication of this problem is if you get a crash
when GNU CC compiles the function @code{muldi3} in file @file{libgcc2.c}. when GCC compiles the function @code{muldi3} in file @file{libgcc2.c}.
You may be able to succeed by getting GNU CC version 1, installing it, You may be able to succeed by getting GCC version 1, installing it,
and using it to compile GNU CC version 2. The bug in the Pyramid C and using it to compile GCC version 2. The bug in the Pyramid C
compiler does not seem to affect GNU CC version 1. compiler does not seem to affect GCC version 1.
@item @item
There may be similar problems on System V Release 3.1 on 386 systems. There may be similar problems on System V Release 3.1 on 386 systems.
...@@ -691,7 +694,7 @@ There may be similar problems on System V Release 3.1 on 386 systems. ...@@ -691,7 +694,7 @@ There may be similar problems on System V Release 3.1 on 386 systems.
@item @item
On the Intel Paragon (an i860 machine), if you are using operating On the Intel Paragon (an i860 machine), if you are using operating
system version 1.0, you will get warnings or errors about redefinition system version 1.0, you will get warnings or errors about redefinition
of @code{va_arg} when you build GNU CC. of @code{va_arg} when you build GCC.
If this happens, then you need to link most programs with the library If this happens, then you need to link most programs with the library
@file{iclib.a}. You must also modify @file{stdio.h} as follows: before @file{iclib.a}. You must also modify @file{stdio.h} as follows: before
...@@ -728,7 +731,7 @@ insert the line ...@@ -728,7 +731,7 @@ insert the line
These problems don't exist in operating system version 1.1. These problems don't exist in operating system version 1.1.
@item @item
On the Altos 3068, programs compiled with GNU CC won't work unless you On the Altos 3068, programs compiled with GCC won't work unless you
fix a kernel bug. This happens using system versions V.2.2 1.0gT1 and fix a kernel bug. This happens using system versions V.2.2 1.0gT1 and
V.2.2 1.0e and perhaps later versions as well. See the file V.2.2 1.0e and perhaps later versions as well. See the file
@file{README.ALTOS}. @file{README.ALTOS}.
...@@ -819,12 +822,12 @@ run. Incompatible libraries are then detected at link time, rather than ...@@ -819,12 +822,12 @@ run. Incompatible libraries are then detected at link time, rather than
at run time. at run time.
@item @item
Older GDB versions sometimes fail to read the output of GNU CC version Older GDB versions sometimes fail to read the output of GCC version
2. If you have trouble, get GDB version 4.4 or later. 2. If you have trouble, get GDB version 4.4 or later.
@item @item
@cindex DBX @cindex DBX
DBX rejects some files produced by GNU CC, though it accepts similar DBX rejects some files produced by GCC, though it accepts similar
constructs in output from PCC. Until someone can supply a coherent constructs in output from PCC. Until someone can supply a coherent
description of what is valid DBX input and what is not, there is description of what is valid DBX input and what is not, there is
nothing I can do about these problems. You are on your own. nothing I can do about these problems. You are on your own.
...@@ -841,10 +844,10 @@ be run. ...@@ -841,10 +844,10 @@ be run.
@item @item
Use of @samp{-I/usr/include} may cause trouble. Use of @samp{-I/usr/include} may cause trouble.
Many systems come with header files that won't work with GNU CC unless Many systems come with header files that won't work with GCC unless
corrected by @code{fixincludes}. The corrected header files go in a new corrected by @code{fixincludes}. The corrected header files go in a new
directory; GNU CC searches this directory before @file{/usr/include}. directory; GCC searches this directory before @file{/usr/include}.
If you use @samp{-I/usr/include}, this tells GNU CC to search If you use @samp{-I/usr/include}, this tells GCC to search
@file{/usr/include} earlier on, before the corrected headers. The @file{/usr/include} earlier on, before the corrected headers. The
result is that you get the uncorrected header files. result is that you get the uncorrected header files.
...@@ -854,7 +857,7 @@ Instead, you should use these options (when compiling C programs): ...@@ -854,7 +857,7 @@ Instead, you should use these options (when compiling C programs):
-I/usr/local/lib/gcc-lib/@var{target}/@var{version}/include -I/usr/include -I/usr/local/lib/gcc-lib/@var{target}/@var{version}/include -I/usr/include
@end smallexample @end smallexample
For C++ programs, GNU CC also uses a special directory that defines C++ For C++ programs, GCC also uses a special directory that defines C++
interfaces to standard C subroutines. This directory is meant to be interfaces to standard C subroutines. This directory is meant to be
searched @emph{before} other standard include directories, so that it searched @emph{before} other standard include directories, so that it
takes precedence. If you are compiling C++ programs and specifying takes precedence. If you are compiling C++ programs and specifying
...@@ -871,7 +874,7 @@ options above: ...@@ -871,7 +874,7 @@ options above:
There is a bug in @code{vfork} on the Sun-4 which causes the registers There is a bug in @code{vfork} on the Sun-4 which causes the registers
of the child process to clobber those of the parent. Because of this, of the child process to clobber those of the parent. Because of this,
programs that call @code{vfork} are likely to lose when compiled programs that call @code{vfork} are likely to lose when compiled
optimized with GNU CC when the child code alters registers which contain optimized with GCC when the child code alters registers which contain
C variables in the parent. This affects variables which are live in the C variables in the parent. This affects variables which are live in the
parent across the call to @code{vfork}. parent across the call to @code{vfork}.
...@@ -884,18 +887,18 @@ using @samp{-O} for those source files. ...@@ -884,18 +887,18 @@ using @samp{-O} for those source files.
@item @item
On some SGI systems, when you use @samp{-lgl_s} as an option, On some SGI systems, when you use @samp{-lgl_s} as an option,
it gets translated magically to @samp{-lgl_s -lX11_s -lc_s}. it gets translated magically to @samp{-lgl_s -lX11_s -lc_s}.
Naturally, this does not happen when you use GNU CC. Naturally, this does not happen when you use GCC.
You must specify all three options explicitly. You must specify all three options explicitly.
@item @item
On a Sparc, GNU CC aligns all values of type @code{double} on an 8-byte On a Sparc, GCC aligns all values of type @code{double} on an 8-byte
boundary, and it expects every @code{double} to be so aligned. The Sun boundary, and it expects every @code{double} to be so aligned. The Sun
compiler usually gives @code{double} values 8-byte alignment, with one compiler usually gives @code{double} values 8-byte alignment, with one
exception: function arguments of type @code{double} may not be aligned. exception: function arguments of type @code{double} may not be aligned.
As a result, if a function compiled with Sun CC takes the address of an As a result, if a function compiled with Sun CC takes the address of an
argument of type @code{double} and passes this pointer of type argument of type @code{double} and passes this pointer of type
@code{double *} to a function compiled with GNU CC, dereferencing the @code{double *} to a function compiled with GCC, dereferencing the
pointer may cause a fatal signal. pointer may cause a fatal signal.
One way to solve this problem is to compile your entire program with GNU One way to solve this problem is to compile your entire program with GNU
...@@ -926,7 +929,7 @@ Storing into the pointer can be done likewise with the same union. ...@@ -926,7 +929,7 @@ Storing into the pointer can be done likewise with the same union.
@item @item
On Solaris, the @code{malloc} function in the @file{libmalloc.a} library On Solaris, the @code{malloc} function in the @file{libmalloc.a} library
may allocate memory that is only 4 byte aligned. Since GNU CC on the may allocate memory that is only 4 byte aligned. Since GCC on the
Sparc assumes that doubles are 8 byte aligned, this may result in a Sparc assumes that doubles are 8 byte aligned, this may result in a
fatal signal if doubles are stored in memory allocated by the fatal signal if doubles are stored in memory allocated by the
@file{libmalloc.a} library. @file{libmalloc.a} library.
...@@ -951,20 +954,20 @@ instructions they must be emulated by the operating system. Long ...@@ -951,20 +954,20 @@ instructions they must be emulated by the operating system. Long
doubles do not work in Sun OS versions 4.0.3 and earlier, because the doubles do not work in Sun OS versions 4.0.3 and earlier, because the
kernel emulator uses an obsolete and incompatible format. Long doubles kernel emulator uses an obsolete and incompatible format. Long doubles
do not work in Sun OS version 4.1.1 due to a problem in a Sun library. do not work in Sun OS version 4.1.1 due to a problem in a Sun library.
Long doubles do work on Sun OS versions 4.1.2 and higher, but GNU CC Long doubles do work on Sun OS versions 4.1.2 and higher, but GCC
does not enable them by default. Long doubles appear to work in Sun OS does not enable them by default. Long doubles appear to work in Sun OS
5.x (Solaris 2.x). 5.x (Solaris 2.x).
@item @item
On HP-UX version 9.01 on the HP PA, the HP compiler @code{cc} does not On HP-UX version 9.01 on the HP PA, the HP compiler @code{cc} does not
compile GNU CC correctly. We do not yet know why. However, GNU CC compile GCC correctly. We do not yet know why. However, GCC
compiled on earlier HP-UX versions works properly on HP-UX 9.01 and can compiled on earlier HP-UX versions works properly on HP-UX 9.01 and can
compile itself properly on 9.01. compile itself properly on 9.01.
@item @item
On the HP PA machine, ADB sometimes fails to work on functions compiled On the HP PA machine, ADB sometimes fails to work on functions compiled
with GNU CC. Specifically, it fails to work on functions that use with GCC. Specifically, it fails to work on functions that use
@code{alloca} or variable-size arrays. This is because GNU CC doesn't @code{alloca} or variable-size arrays. This is because GCC doesn't
generate HP-UX unwind descriptors for such functions. It may even be generate HP-UX unwind descriptors for such functions. It may even be
impossible to generate them. impossible to generate them.
...@@ -986,11 +989,11 @@ the HP assembler. GAS for the PA does not have this problem. ...@@ -986,11 +989,11 @@ the HP assembler. GAS for the PA does not have this problem.
In extremely rare cases involving some very large functions you may In extremely rare cases involving some very large functions you may
receive errors from the HP linker complaining about an out of bounds receive errors from the HP linker complaining about an out of bounds
unconditional branch offset. This used to occur more often in previous unconditional branch offset. This used to occur more often in previous
versions of GNU CC, but is now exceptionally rare. If you should run versions of GCC, but is now exceptionally rare. If you should run
into it, you can work around by making your function smaller. into it, you can work around by making your function smaller.
@item @item
GNU CC compiled code sometimes emits warnings from the HP-UX assembler of GCC compiled code sometimes emits warnings from the HP-UX assembler of
the form: the form:
@smallexample @smallexample
...@@ -1064,7 +1067,7 @@ by requesting PTF 421749 from IBM. ...@@ -1064,7 +1067,7 @@ by requesting PTF 421749 from IBM.
@item @item
There is an assembler bug in versions of DG/UX prior to 5.4.2.01 that There is an assembler bug in versions of DG/UX prior to 5.4.2.01 that
occurs when the @samp{fldcr} instruction is used. GNU CC uses occurs when the @samp{fldcr} instruction is used. GCC uses
@samp{fldcr} on the 88100 to serialize volatile memory references. Use @samp{fldcr} on the 88100 to serialize volatile memory references. Use
the option @samp{-mno-serialize-volatile} if your version of the the option @samp{-mno-serialize-volatile} if your version of the
assembler has this bug. assembler has this bug.
...@@ -1090,7 +1093,7 @@ lines around the definition of @code{size_t}: ...@@ -1090,7 +1093,7 @@ lines around the definition of @code{size_t}:
@cindex Alliant @cindex Alliant
@item @item
On the Alliant, the system's own convention for returning structures On the Alliant, the system's own convention for returning structures
and unions is unusual, and is not compatible with GNU CC no matter and unions is unusual, and is not compatible with GCC no matter
what options are used. what options are used.
@cindex RT PC @cindex RT PC
...@@ -1098,7 +1101,7 @@ what options are used. ...@@ -1098,7 +1101,7 @@ what options are used.
@item @item
On the IBM RT PC, the MetaWare HighC compiler (hc) uses a different On the IBM RT PC, the MetaWare HighC compiler (hc) uses a different
convention for structure and union returning. Use the option convention for structure and union returning. Use the option
@samp{-mhc-struct-return} to tell GNU CC to use a convention compatible @samp{-mhc-struct-return} to tell GCC to use a convention compatible
with it. with it.
@cindex Vax calling convention @cindex Vax calling convention
...@@ -1108,7 +1111,7 @@ On Ultrix, the Fortran compiler expects registers 2 through 5 to be saved ...@@ -1108,7 +1111,7 @@ On Ultrix, the Fortran compiler expects registers 2 through 5 to be saved
by function calls. However, the C compiler uses conventions compatible by function calls. However, the C compiler uses conventions compatible
with BSD Unix: registers 2 through 5 may be clobbered by function calls. with BSD Unix: registers 2 through 5 may be clobbered by function calls.
GNU CC uses the same convention as the Ultrix C compiler. You can use GCC uses the same convention as the Ultrix C compiler. You can use
these options to produce code compatible with the Fortran compiler: these options to produce code compatible with the Fortran compiler:
@smallexample @smallexample
...@@ -1116,7 +1119,7 @@ these options to produce code compatible with the Fortran compiler: ...@@ -1116,7 +1119,7 @@ these options to produce code compatible with the Fortran compiler:
@end smallexample @end smallexample
@item @item
On the WE32k, you may find that programs compiled with GNU CC do not On the WE32k, you may find that programs compiled with GCC do not
work with the standard shared C library. You may need to link with work with the standard shared C library. You may need to link with
the ordinary C compiler. If you do so, you must specify the following the ordinary C compiler. If you do so, you must specify the following
options: options:
...@@ -1128,7 +1131,7 @@ options: ...@@ -1128,7 +1131,7 @@ options:
The first specifies where to find the library @file{libgcc.a} The first specifies where to find the library @file{libgcc.a}
specified with the @samp{-lgcc} option. specified with the @samp{-lgcc} option.
GNU CC does linking by invoking @code{ld}, just as @code{cc} does, and GCC does linking by invoking @code{ld}, just as @code{cc} does, and
there is no reason why it @emph{should} matter which compilation program there is no reason why it @emph{should} matter which compilation program
you use to invoke @code{ld}. If someone tracks this problem down, you use to invoke @code{ld}. If someone tracks this problem down,
it can probably be fixed easily. it can probably be fixed easily.
...@@ -1145,7 +1148,7 @@ sometimes reorders instructions incorrectly when optimization is turned ...@@ -1145,7 +1148,7 @@ sometimes reorders instructions incorrectly when optimization is turned
on. If you think this may be happening to you, try using the GNU on. If you think this may be happening to you, try using the GNU
assembler; GAS version 2.1 supports ECOFF on Irix. assembler; GAS version 2.1 supports ECOFF on Irix.
Or use the @samp{-noasmopt} option when you compile GNU CC with itself, Or use the @samp{-noasmopt} option when you compile GCC with itself,
and then again when you compile your program. (This is a temporary and then again when you compile your program. (This is a temporary
kludge to turn off assembler optimization on Irix.) If this proves to kludge to turn off assembler optimization on Irix.) If this proves to
be what you need, edit the assembler spec in the file @file{specs} so be what you need, edit the assembler spec in the file @file{specs} so
...@@ -1197,13 +1200,13 @@ On various 386 Unix systems derived from System V, including SCO, ISC, ...@@ -1197,13 +1200,13 @@ On various 386 Unix systems derived from System V, including SCO, ISC,
and ESIX, you may get error messages about running out of virtual memory and ESIX, you may get error messages about running out of virtual memory
while compiling certain programs. while compiling certain programs.
You can prevent this problem by linking GNU CC with the GNU malloc You can prevent this problem by linking GCC with the GNU malloc
(which thus replaces the malloc that comes with the system). GNU malloc (which thus replaces the malloc that comes with the system). GNU malloc
is available as a separate package, and also in the file is available as a separate package, and also in the file
@file{src/gmalloc.c} in the GNU Emacs 19 distribution. @file{src/gmalloc.c} in the GNU Emacs 19 distribution.
If you have installed GNU malloc as a separate library package, use this If you have installed GNU malloc as a separate library package, use this
option when you relink GNU CC: option when you relink GCC:
@example @example
MALLOC=/usr/local/lib/libgmalloc.a MALLOC=/usr/local/lib/libgmalloc.a
...@@ -1211,7 +1214,7 @@ MALLOC=/usr/local/lib/libgmalloc.a ...@@ -1211,7 +1214,7 @@ MALLOC=/usr/local/lib/libgmalloc.a
Alternatively, if you have compiled @file{gmalloc.c} from Emacs 19, copy Alternatively, if you have compiled @file{gmalloc.c} from Emacs 19, copy
the object file to @file{gmalloc.o} and use this option when you relink the object file to @file{gmalloc.o} and use this option when you relink
GNU CC: GCC:
@example @example
MALLOC=gmalloc.o MALLOC=gmalloc.o
...@@ -1219,8 +1222,8 @@ MALLOC=gmalloc.o ...@@ -1219,8 +1222,8 @@ MALLOC=gmalloc.o
@end itemize @end itemize
@node Incompatibilities @node Incompatibilities
@section Incompatibilities of GNU CC @section Incompatibilities of GCC
@cindex incompatibilities of GNU CC @cindex incompatibilities of GCC
There are several noteworthy incompatibilities between GNU C and most There are several noteworthy incompatibilities between GNU C and most
existing (non-ANSI) versions of C. The @samp{-traditional} option existing (non-ANSI) versions of C. The @samp{-traditional} option
...@@ -1232,8 +1235,8 @@ telling GNU C to behave like the other C compilers. ...@@ -1232,8 +1235,8 @@ telling GNU C to behave like the other C compilers.
@cindex read-only strings @cindex read-only strings
@cindex shared strings @cindex shared strings
@item @item
GNU CC normally makes string constants read-only. If several GCC normally makes string constants read-only. If several
identical-looking string constants are used, GNU CC stores only one identical-looking string constants are used, GCC stores only one
copy of the string. copy of the string.
@cindex @code{mktemp}, and constant strings @cindex @code{mktemp}, and constant strings
...@@ -1252,7 +1255,7 @@ constant. Likewise @code{fscanf} and @code{scanf}. ...@@ -1252,7 +1255,7 @@ constant. Likewise @code{fscanf} and @code{scanf}.
The best solution to these problems is to change the program to use The best solution to these problems is to change the program to use
@code{char}-array variables with initialization strings for these @code{char}-array variables with initialization strings for these
purposes instead of string constants. But if this is not possible, purposes instead of string constants. But if this is not possible,
you can use the @samp{-fwritable-strings} flag, which directs GNU CC you can use the @samp{-fwritable-strings} flag, which directs GCC
to handle string constants the same way most C compilers do. to handle string constants the same way most C compilers do.
@samp{-traditional} also has this effect, among others. @samp{-traditional} also has this effect, among others.
...@@ -1264,8 +1267,8 @@ This is because 2147483648 cannot fit in the type @code{int}, so ...@@ -1264,8 +1267,8 @@ This is because 2147483648 cannot fit in the type @code{int}, so
Negating this value yields 2147483648 again. Negating this value yields 2147483648 again.
@item @item
GNU CC does not substitute macro arguments when they appear inside of GCC does not substitute macro arguments when they appear inside of
string constants. For example, the following macro in GNU CC string constants. For example, the following macro in GCC
@example @example
#define foo(a) "a" #define foo(a) "a"
...@@ -1274,7 +1277,7 @@ string constants. For example, the following macro in GNU CC ...@@ -1274,7 +1277,7 @@ string constants. For example, the following macro in GNU CC
@noindent @noindent
will produce output @code{"a"} regardless of what the argument @var{a} is. will produce output @code{"a"} regardless of what the argument @var{a} is.
The @samp{-traditional} option directs GNU CC to handle such cases The @samp{-traditional} option directs GCC to handle such cases
(among others) in the old-fashioned (non-ANSI) fashion. (among others) in the old-fashioned (non-ANSI) fashion.
@cindex @code{setjmp} incompatibilities @cindex @code{setjmp} incompatibilities
...@@ -1308,7 +1311,7 @@ its first value is restored; otherwise, it keeps the last value stored ...@@ -1308,7 +1311,7 @@ its first value is restored; otherwise, it keeps the last value stored
in it. in it.
If you use the @samp{-W} option with the @samp{-O} option, you will If you use the @samp{-W} option with the @samp{-O} option, you will
get a warning when GNU CC thinks such a problem might be possible. get a warning when GCC thinks such a problem might be possible.
The @samp{-traditional} option directs GNU C to put variables in The @samp{-traditional} option directs GNU C to put variables in
the stack by default, rather than in registers, in functions that the stack by default, rather than in registers, in functions that
...@@ -1317,7 +1320,7 @@ traditional C compilers. ...@@ -1317,7 +1320,7 @@ traditional C compilers.
@item @item
Programs that use preprocessing directives in the middle of macro Programs that use preprocessing directives in the middle of macro
arguments do not work with GNU CC. For example, a program like this arguments do not work with GCC. For example, a program like this
will not work: will not work:
@example @example
...@@ -1366,17 +1369,17 @@ difficulty described immediately above applies here too. ...@@ -1366,17 +1369,17 @@ difficulty described immediately above applies here too.
@cindex whitespace @cindex whitespace
@item @item
PCC allows whitespace in the middle of compound assignment operators PCC allows whitespace in the middle of compound assignment operators
such as @samp{+=}. GNU CC, following the ANSI standard, does not such as @samp{+=}. GCC, following the ANSI standard, does not
allow this. The difficulty described immediately above applies here allow this. The difficulty described immediately above applies here
too. too.
@cindex apostrophes @cindex apostrophes
@cindex ' @cindex '
@item @item
GNU CC complains about unterminated character constants inside of GCC complains about unterminated character constants inside of
preprocessing conditionals that fail. Some programs have English preprocessing conditionals that fail. Some programs have English
comments enclosed in conditionals that are guaranteed to fail; if these comments enclosed in conditionals that are guaranteed to fail; if these
comments contain apostrophes, GNU CC will probably report an error. For comments contain apostrophes, GCC will probably report an error. For
example, this code would produce an error: example, this code would produce an error:
@example @example
...@@ -1403,38 +1406,38 @@ type of @code{time}. ...@@ -1403,38 +1406,38 @@ type of @code{time}.
@cindex @code{float} as function value type @cindex @code{float} as function value type
@item @item
When compiling functions that return @code{float}, PCC converts it to When compiling functions that return @code{float}, PCC converts it to
a double. GNU CC actually returns a @code{float}. If you are concerned a double. GCC actually returns a @code{float}. If you are concerned
with PCC compatibility, you should declare your functions to return with PCC compatibility, you should declare your functions to return
@code{double}; you might as well say what you mean. @code{double}; you might as well say what you mean.
@cindex structures @cindex structures
@cindex unions @cindex unions
@item @item
When compiling functions that return structures or unions, GNU CC When compiling functions that return structures or unions, GCC
output code normally uses a method different from that used on most output code normally uses a method different from that used on most
versions of Unix. As a result, code compiled with GNU CC cannot call versions of Unix. As a result, code compiled with GCC cannot call
a structure-returning function compiled with PCC, and vice versa. a structure-returning function compiled with PCC, and vice versa.
The method used by GNU CC is as follows: a structure or union which is The method used by GCC is as follows: a structure or union which is
1, 2, 4 or 8 bytes long is returned like a scalar. A structure or union 1, 2, 4 or 8 bytes long is returned like a scalar. A structure or union
with any other size is stored into an address supplied by the caller with any other size is stored into an address supplied by the caller
(usually in a special, fixed register, but on some machines it is passed (usually in a special, fixed register, but on some machines it is passed
on the stack). The machine-description macros @code{STRUCT_VALUE} and on the stack). The machine-description macros @code{STRUCT_VALUE} and
@code{STRUCT_INCOMING_VALUE} tell GNU CC where to pass this address. @code{STRUCT_INCOMING_VALUE} tell GCC where to pass this address.
By contrast, PCC on most target machines returns structures and unions By contrast, PCC on most target machines returns structures and unions
of any size by copying the data into an area of static storage, and then of any size by copying the data into an area of static storage, and then
returning the address of that storage as if it were a pointer value. returning the address of that storage as if it were a pointer value.
The caller must copy the data from that memory area to the place where The caller must copy the data from that memory area to the place where
the value is wanted. GNU CC does not use this method because it is the value is wanted. GCC does not use this method because it is
slower and nonreentrant. slower and nonreentrant.
On some newer machines, PCC uses a reentrant convention for all On some newer machines, PCC uses a reentrant convention for all
structure and union returning. GNU CC on most of these machines uses a structure and union returning. GCC on most of these machines uses a
compatible convention when returning structures and unions in memory, compatible convention when returning structures and unions in memory,
but still returns small structures and unions in registers. but still returns small structures and unions in registers.
You can tell GNU CC to use a compatible convention for all structure and You can tell GCC to use a compatible convention for all structure and
union returning with the option @samp{-fpcc-struct-return}. union returning with the option @samp{-fpcc-struct-return}.
@cindex preprocessing tokens @cindex preprocessing tokens
...@@ -1460,13 +1463,13 @@ the minus sign. This whitespace will end the preprocessing number. ...@@ -1460,13 +1463,13 @@ the minus sign. This whitespace will end the preprocessing number.
@node Fixed Headers @node Fixed Headers
@section Fixed Header Files @section Fixed Header Files
GNU CC needs to install corrected versions of some system header files. GCC needs to install corrected versions of some system header files.
This is because most target systems have some header files that won't This is because most target systems have some header files that won't
work with GNU CC unless they are changed. Some have bugs, some are work with GCC unless they are changed. Some have bugs, some are
incompatible with ANSI C, and some depend on special features of other incompatible with ANSI C, and some depend on special features of other
compilers. compilers.
Installing GNU CC automatically creates and installs the fixed header Installing GCC automatically creates and installs the fixed header
files, by running a program called @code{fixincludes} (or for certain files, by running a program called @code{fixincludes} (or for certain
targets an alternative such as @code{fixinc.svr4}). Normally, you targets an alternative such as @code{fixinc.svr4}). Normally, you
don't need to pay attention to this. But there are cases where it don't need to pay attention to this. But there are cases where it
...@@ -1475,8 +1478,8 @@ doesn't do the right thing automatically. ...@@ -1475,8 +1478,8 @@ doesn't do the right thing automatically.
@itemize @bullet @itemize @bullet
@item @item
If you update the system's header files, such as by installing a new If you update the system's header files, such as by installing a new
system version, the fixed header files of GNU CC are not automatically system version, the fixed header files of GCC are not automatically
updated. The easiest way to update them is to reinstall GNU CC. (If updated. The easiest way to update them is to reinstall GCC. (If
you want to be clever, look in the makefile and you can find a you want to be clever, look in the makefile and you can find a
shortcut.) shortcut.)
...@@ -1499,18 +1502,18 @@ different machine models, and arrange a structure of symbolic links so ...@@ -1499,18 +1502,18 @@ different machine models, and arrange a structure of symbolic links so
as to use the proper set, but you'll have to do this by hand. as to use the proper set, but you'll have to do this by hand.
@item @item
On Lynxos, GNU CC by default does not fix the header files. This is On Lynxos, GCC by default does not fix the header files. This is
because bugs in the shell cause the @code{fixincludes} script to fail. because bugs in the shell cause the @code{fixincludes} script to fail.
This means you will encounter problems due to bugs in the system header This means you will encounter problems due to bugs in the system header
files. It may be no comfort that they aren't GNU CC's fault, but it files. It may be no comfort that they aren't GCC's fault, but it
does mean that there's nothing for us to do about them. does mean that there's nothing for us to do about them.
@end itemize @end itemize
@node Standard Libraries @node Standard Libraries
@section Standard Libraries @section Standard Libraries
GNU CC by itself attempts to be what the ISO/ANSI C standard calls a GCC by itself attempts to be what the ISO/ANSI C standard calls a
@dfn{conforming freestanding implementation}. This means all ANSI @dfn{conforming freestanding implementation}. This means all ANSI
C language features are available, as well as the contents of C language features are available, as well as the contents of
@file{float.h}, @file{limits.h}, @file{stdarg.h}, and @file{float.h}, @file{limits.h}, @file{stdarg.h}, and
...@@ -1526,7 +1529,7 @@ this function match the Standard, but that would be wrong, since the ...@@ -1526,7 +1529,7 @@ this function match the Standard, but that would be wrong, since the
function will still return @code{char *}. function will still return @code{char *}.
If you need a Standard compliant library, then you need to find one, as If you need a Standard compliant library, then you need to find one, as
GNU CC does not provide one. The GNU C library (called @code{glibc}) GCC does not provide one. The GNU C library (called @code{glibc})
has been ported to a number of operating systems, and provides ANSI/ISO, has been ported to a number of operating systems, and provides ANSI/ISO,
POSIX, BSD and SystemV compatibility. You could also ask your operating POSIX, BSD and SystemV compatibility. You could also ask your operating
system vendor if newer libraries are available. system vendor if newer libraries are available.
...@@ -1542,10 +1545,10 @@ way around them. ...@@ -1542,10 +1545,10 @@ way around them.
Certain local variables aren't recognized by debuggers when you compile Certain local variables aren't recognized by debuggers when you compile
with optimization. with optimization.
This occurs because sometimes GNU CC optimizes the variable out of This occurs because sometimes GCC optimizes the variable out of
existence. There is no way to tell the debugger how to compute the existence. There is no way to tell the debugger how to compute the
value such a variable ``would have had'', and it is not clear that would value such a variable ``would have had'', and it is not clear that would
be desirable anyway. So GNU CC simply does not mention the eliminated be desirable anyway. So GCC simply does not mention the eliminated
variable when it writes debugging information. variable when it writes debugging information.
You have to expect a certain amount of disagreement between the You have to expect a certain amount of disagreement between the
...@@ -1554,7 +1557,7 @@ executable and your source code, when you use optimization. ...@@ -1554,7 +1557,7 @@ executable and your source code, when you use optimization.
@cindex conflicting types @cindex conflicting types
@cindex scope of declaration @cindex scope of declaration
@item @item
Users often think it is a bug when GNU CC reports an error for code Users often think it is a bug when GCC reports an error for code
like this: like this:
@example @example
...@@ -1592,14 +1595,14 @@ If you care about controlling the amount of memory that is accessed, use ...@@ -1592,14 +1595,14 @@ If you care about controlling the amount of memory that is accessed, use
volatile but do not use bitfields. volatile but do not use bitfields.
@item @item
GNU CC comes with shell scripts to fix certain known problems in system GCC comes with shell scripts to fix certain known problems in system
header files. They install corrected copies of various header files in header files. They install corrected copies of various header files in
a special directory where only GNU CC will normally look for them. The a special directory where only GCC will normally look for them. The
scripts adapt to various systems by searching all the system header scripts adapt to various systems by searching all the system header
files for the problem cases that we know about. files for the problem cases that we know about.
If new system header files are installed, nothing automatically arranges If new system header files are installed, nothing automatically arranges
to update the corrected header files. You will have to reinstall GNU CC to update the corrected header files. You will have to reinstall GCC
to fix the new header files. More specifically, go to the build to fix the new header files. More specifically, go to the build
directory and delete the files @file{stmp-fixinc} and directory and delete the files @file{stmp-fixinc} and
@file{stmp-headers}, and the subdirectory @code{include}; then do @file{stmp-headers}, and the subdirectory @code{include}; then do
...@@ -1891,7 +1894,7 @@ eighty characters in any case.) ...@@ -1891,7 +1894,7 @@ eighty characters in any case.)
@section Certain Changes We Don't Want to Make @section Certain Changes We Don't Want to Make
This section lists changes that people frequently request, but which This section lists changes that people frequently request, but which
we do not make because we think GNU CC is better without them. we do not make because we think GCC is better without them.
@itemize @bullet @itemize @bullet
@item @item
...@@ -1992,12 +1995,12 @@ that machine. But such applications are rare. And users writing a ...@@ -1992,12 +1995,12 @@ that machine. But such applications are rare. And users writing a
program to run on more than one type of machine cannot possibly benefit program to run on more than one type of machine cannot possibly benefit
from this kind of compatibility. from this kind of compatibility.
This is why GNU CC does and will treat plain bitfields in the same This is why GCC does and will treat plain bitfields in the same
fashion on all types of machines (by default). fashion on all types of machines (by default).
There are some arguments for making bitfields unsigned by default on all There are some arguments for making bitfields unsigned by default on all
machines. If, for example, this becomes a universal de facto standard, machines. If, for example, this becomes a universal de facto standard,
it would make sense for GNU CC to go along with it. This is something it would make sense for GCC to go along with it. This is something
to be considered in the future. to be considered in the future.
(Of course, users strongly concerned about portability should indicate (Of course, users strongly concerned about portability should indicate
...@@ -2007,7 +2010,7 @@ they write programs which have the same meaning in both C dialects.) ...@@ -2007,7 +2010,7 @@ they write programs which have the same meaning in both C dialects.)
@item @item
Undefining @code{__STDC__} when @samp{-ansi} is not used. Undefining @code{__STDC__} when @samp{-ansi} is not used.
Currently, GNU CC defines @code{__STDC__} as long as you don't use Currently, GCC defines @code{__STDC__} as long as you don't use
@samp{-traditional}. This provides good results in practice. @samp{-traditional}. This provides good results in practice.
Programmers normally use conditionals on @code{__STDC__} to ask whether Programmers normally use conditionals on @code{__STDC__} to ask whether
...@@ -2033,11 +2036,11 @@ compilers such as plain @samp{gcc}. Whatever the ANSI C standard says ...@@ -2033,11 +2036,11 @@ compilers such as plain @samp{gcc}. Whatever the ANSI C standard says
is relevant to the design of plain @samp{gcc} without @samp{-ansi} only is relevant to the design of plain @samp{gcc} without @samp{-ansi} only
for pragmatic reasons, not as a requirement. for pragmatic reasons, not as a requirement.
GNU CC normally defines @code{__STDC__} to be 1, and in addition GCC normally defines @code{__STDC__} to be 1, and in addition
defines @code{__STRICT_ANSI__} if you specify the @samp{-ansi} option. defines @code{__STRICT_ANSI__} if you specify the @samp{-ansi} option.
On some hosts, system include files use a different convention, where On some hosts, system include files use a different convention, where
@code{__STDC__} is normally 0, but is 1 if the user specifies strict @code{__STDC__} is normally 0, but is 1 if the user specifies strict
conformance to the C Standard. GNU CC follows the host convention when conformance to the C Standard. GCC follows the host convention when
processing system include files, but when processing user files it follows processing system include files, but when processing user files it follows
the usual GNU C convention. the usual GNU C convention.
...@@ -2063,7 +2066,7 @@ test explicitly for C++ as well. ...@@ -2063,7 +2066,7 @@ test explicitly for C++ as well.
@item @item
Deleting ``empty'' loops. Deleting ``empty'' loops.
Historically, GNU CC has not deleted ``empty'' loops under the Historically, GCC has not deleted ``empty'' loops under the
assumption that the most likely reason you would put one in a program is assumption that the most likely reason you would put one in a program is
to have a delay, so deleting them will not make real programs run any to have a delay, so deleting them will not make real programs run any
faster. faster.
...@@ -2118,7 +2121,7 @@ warnings. Each kind has a different purpose: ...@@ -2118,7 +2121,7 @@ warnings. Each kind has a different purpose:
@itemize @w{} @itemize @w{}
@item @item
@emph{Errors} report problems that make it impossible to compile your @emph{Errors} report problems that make it impossible to compile your
program. GNU CC reports errors with the source file name and line program. GCC reports errors with the source file name and line
number where the problem is apparent. number where the problem is apparent.
@item @item
...@@ -2136,12 +2139,12 @@ warnings are issued only if you ask for them, with one of the @samp{-W} ...@@ -2136,12 +2139,12 @@ warnings are issued only if you ask for them, with one of the @samp{-W}
options (for instance, @samp{-Wall} requests a variety of useful options (for instance, @samp{-Wall} requests a variety of useful
warnings). warnings).
GNU CC always tries to compile your program if possible; it never GCC always tries to compile your program if possible; it never
gratuitously rejects a program whose meaning is clear merely because gratuitously rejects a program whose meaning is clear merely because
(for instance) it fails to conform to a standard. In some cases, (for instance) it fails to conform to a standard. In some cases,
however, the C and C++ standards specify that certain extensions are however, the C and C++ standards specify that certain extensions are
forbidden, and a diagnostic @emph{must} be issued by a conforming forbidden, and a diagnostic @emph{must} be issued by a conforming
compiler. The @samp{-pedantic} option tells GNU CC to issue warnings in compiler. The @samp{-pedantic} option tells GCC to issue warnings in
such cases; @samp{-pedantic-errors} says to make them errors instead. such cases; @samp{-pedantic-errors} says to make them errors instead.
This does not mean that @emph{all} non-ANSI constructs get warnings This does not mean that @emph{all} non-ANSI constructs get warnings
or errors. or errors.
...@@ -2154,7 +2157,7 @@ more detail on these and related command-line options. ...@@ -2154,7 +2157,7 @@ more detail on these and related command-line options.
@cindex bugs @cindex bugs
@cindex reporting bugs @cindex reporting bugs
Your bug reports play an essential role in making GNU CC reliable. Your bug reports play an essential role in making GCC reliable.
When you encounter a problem, the first thing to do is to see if it is When you encounter a problem, the first thing to do is to see if it is
already known. @xref{Trouble}. If it isn't known, then you should already known. @xref{Trouble}. If it isn't known, then you should
...@@ -2163,8 +2166,8 @@ report the problem. ...@@ -2163,8 +2166,8 @@ report the problem.
Reporting a bug may help you by bringing a solution to your problem, or Reporting a bug may help you by bringing a solution to your problem, or
it may not. (If it does not, look in the service directory; see it may not. (If it does not, look in the service directory; see
@ref{Service}.) In any case, the principal function of a bug report is @ref{Service}.) In any case, the principal function of a bug report is
to help the entire community by making the next version of GNU CC work to help the entire community by making the next version of GCC work
better. Bug reports are your contribution to the maintenance of GNU CC. better. Bug reports are your contribution to the maintenance of GCC.
Since the maintainers are very overloaded, we cannot respond to every Since the maintainers are very overloaded, we cannot respond to every
bug report. However, if the bug has not been fixed, we are likely to bug report. However, if the bug has not been fixed, we are likely to
...@@ -2177,7 +2180,7 @@ information that makes for fixing the bug. ...@@ -2177,7 +2180,7 @@ information that makes for fixing the bug.
* Criteria: Bug Criteria. Have you really found a bug? * Criteria: Bug Criteria. Have you really found a bug?
* Where: Bug Lists. Where to send your bug report. * Where: Bug Lists. Where to send your bug report.
* Reporting: Bug Reporting. How to report a bug effectively. * Reporting: Bug Reporting. How to report a bug effectively.
* Patches: Sending Patches. How to send a patch for GNU CC. * Patches: Sending Patches. How to send a patch for GCC.
* Known: Trouble. Known problems. * Known: Trouble. Known problems.
* Help: Service. Where to ask for help. * Help: Service. Where to ask for help.
@end menu @end menu
...@@ -2221,11 +2224,11 @@ by chance to give the desired results with another C or C++ compiler. ...@@ -2221,11 +2224,11 @@ by chance to give the desired results with another C or C++ compiler.
For example, in many nonoptimizing compilers, you can write @samp{x;} For example, in many nonoptimizing compilers, you can write @samp{x;}
at the end of a function instead of @samp{return x;}, with the same at the end of a function instead of @samp{return x;}, with the same
results. But the value of the function is undefined if @code{return} results. But the value of the function is undefined if @code{return}
is omitted; it is not a bug when GNU CC produces different results. is omitted; it is not a bug when GCC produces different results.
Problems often result from expressions with two increment operators, Problems often result from expressions with two increment operators,
as in @code{f (*p++, *p++)}. Your previous compiler might have as in @code{f (*p++, *p++)}. Your previous compiler might have
interpreted that expression the way you intended; GNU CC might interpreted that expression the way you intended; GCC might
interpret it another way. Neither compiler is wrong. The bug is interpret it another way. Neither compiler is wrong. The bug is
in your code. in your code.
...@@ -2245,8 +2248,9 @@ that is a compiler bug. However, you should note that your idea of ...@@ -2245,8 +2248,9 @@ that is a compiler bug. However, you should note that your idea of
for traditional practice''. for traditional practice''.
@item @item
If you are an experienced user of C or C++ compilers, your suggestions If you are an experienced user of C or C++ (or Fortran or Objective-C)
for improvement of GNU CC or GNU C++ are welcome in any case. compilers, your suggestions
for improvement of GCC are welcome in any case.
@end itemize @end itemize
@node Bug Lists @node Bug Lists
...@@ -2319,11 +2323,11 @@ things: ...@@ -2319,11 +2323,11 @@ things:
@itemize @bullet @itemize @bullet
@item @item
The version of GNU CC. You can get this by running it with the The version of GCC. You can get this by running it with the
@samp{-v} option. @samp{-v} option.
Without this, we won't know whether there is any point in looking for Without this, we won't know whether there is any point in looking for
the bug in the current version of GNU CC. the bug in the current version of GCC.
@item @item
A complete input file that will reproduce the bug. If the bug is in the A complete input file that will reproduce the bug. If the bug is in the
...@@ -2345,16 +2349,16 @@ provoke the bug. For example, bugs in register allocation and reloading ...@@ -2345,16 +2349,16 @@ provoke the bug. For example, bugs in register allocation and reloading
frequently depend on every little detail of the function they happen in. frequently depend on every little detail of the function they happen in.
Even if the input file that fails comes from a GNU program, you should Even if the input file that fails comes from a GNU program, you should
still send the complete test case. Don't ask the GNU CC maintainers to still send the complete test case. Don't ask the GCC maintainers to
do the extra work of obtaining the program in question---they are all do the extra work of obtaining the program in question---they are all
overworked as it is. Also, the problem may depend on what is in the overworked as it is. Also, the problem may depend on what is in the
header files on your system; it is unreliable for the GNU CC maintainers header files on your system; it is unreliable for the GCC maintainers
to try the problem with the header files available to them. By sending to try the problem with the header files available to them. By sending
CPP output, you can eliminate this source of uncertainty and save us CPP output, you can eliminate this source of uncertainty and save us
a certain percentage of wild goose chases. a certain percentage of wild goose chases.
@item @item
The command arguments you gave GNU CC or GNU C++ to compile that example The command arguments you gave GCC to compile that example
and observe the bug. For example, did you use @samp{-O}? To guarantee and observe the bug. For example, did you use @samp{-O}? To guarantee
you won't omit something important, list all the options. you won't omit something important, list all the options.
...@@ -2383,7 +2387,7 @@ don't support) is a modification of the compiler source. ...@@ -2383,7 +2387,7 @@ don't support) is a modification of the compiler source.
@item @item
Details of any other deviations from the standard procedure for installing Details of any other deviations from the standard procedure for installing
GNU CC. GCC.
@item @item
A description of what behavior you observe that you believe is A description of what behavior you observe that you believe is
...@@ -2406,7 +2410,7 @@ was not happening. If you don't say to expect a crash, then we would ...@@ -2406,7 +2410,7 @@ was not happening. If you don't say to expect a crash, then we would
not know whether the bug was happening. We would not be able to draw not know whether the bug was happening. We would not be able to draw
any conclusion from our observations. any conclusion from our observations.
If the problem is a diagnostic when compiling GNU CC with some other If the problem is a diagnostic when compiling GCC with some other
compiler, say whether it is a warning or an error. compiler, say whether it is a warning or an error.
Often the observed symptom is incorrect output when your program is run. Often the observed symptom is incorrect output when your program is run.
...@@ -2419,13 +2423,13 @@ person who understands the program can find this as easily as finding a ...@@ -2419,13 +2423,13 @@ person who understands the program can find this as easily as finding a
bug in the program itself. bug in the program itself.
@item @item
If you send examples of assembler code output from GNU CC or GNU C++, If you send examples of assembler code output from GCC,
please use @samp{-g} when you make them. The debugging information please use @samp{-g} when you make them. The debugging information
includes source line numbers which are essential for correlating the includes source line numbers which are essential for correlating the
output with the input. output with the input.
@item @item
If you wish to mention something in the GNU CC source, refer to it by If you wish to mention something in the GCC source, refer to it by
context, not by line number. context, not by line number.
The line numbers in the development sources don't match those in your The line numbers in the development sources don't match those in your
...@@ -2441,7 +2445,7 @@ any chance of being useful. ...@@ -2441,7 +2445,7 @@ any chance of being useful.
@cindex backtrace for bug reports @cindex backtrace for bug reports
For example, many people send just a backtrace, but that is never For example, many people send just a backtrace, but that is never
useful by itself. A simple backtrace with arguments conveys little useful by itself. A simple backtrace with arguments conveys little
about GNU CC because the compiler is largely data-driven; the same about GCC because the compiler is largely data-driven; the same
functions are called over and over for different RTL insns, doing functions are called over and over for different RTL insns, doing
different things depending on the details of the insn. different things depending on the details of the insn.
...@@ -2485,7 +2489,7 @@ as well save your time for something else. ...@@ -2485,7 +2489,7 @@ as well save your time for something else.
Of course, if you can find a simpler example to report @emph{instead} of Of course, if you can find a simpler example to report @emph{instead} of
the original one, that is a convenience. Errors in the output will be the original one, that is a convenience. Errors in the output will be
easier to spot, running under the debugger will take less time, etc. easier to spot, running under the debugger will take less time, etc.
Most GNU CC bugs involve just one function, so the most straightforward Most GCC bugs involve just one function, so the most straightforward
way to simplify an example is to delete all the function definitions way to simplify an example is to delete all the function definitions
except the one where the bug occurs. Those earlier in the file may be except the one where the bug occurs. Those earlier in the file may be
replaced by external declarations if the crucial function depends on replaced by external declarations if the crucial function depends on
...@@ -2509,7 +2513,7 @@ necessary information, such as the test case, on the assumption that a ...@@ -2509,7 +2513,7 @@ necessary information, such as the test case, on the assumption that a
patch is all we need. We might see problems with your patch and decide patch is all we need. We might see problems with your patch and decide
to fix the problem another way, or we might not understand it at all. to fix the problem another way, or we might not understand it at all.
Sometimes with a program as complicated as GNU CC it is very hard to Sometimes with a program as complicated as GCC it is very hard to
construct an example that will make the program follow a certain path construct an example that will make the program follow a certain path
through the code. If you don't send the example, we won't be able to through the code. If you don't send the example, we won't be able to
construct one, so we won't be able to verify that the bug is fixed. construct one, so we won't be able to verify that the bug is fixed.
...@@ -2536,7 +2540,7 @@ we should be able to reproduce the crash ourselves. ...@@ -2536,7 +2540,7 @@ we should be able to reproduce the crash ourselves.
@end itemize @end itemize
@node Sending Patches,, Bug Reporting, Bugs @node Sending Patches,, Bug Reporting, Bugs
@section Sending Patches for GNU CC @section Sending Patches for GCC
If you would like to write bug fixes or improvements for the GNU C If you would like to write bug fixes or improvements for the GNU C
compiler, that is very helpful. Send suggested fixes to the patches compiler, that is very helpful. Send suggested fixes to the patches
...@@ -2633,7 +2637,7 @@ would break other systems. ...@@ -2633,7 +2637,7 @@ would break other systems.
People often suggest fixing a problem by changing machine-independent People often suggest fixing a problem by changing machine-independent
files such as @file{toplev.c} to do something special that a particular files such as @file{toplev.c} to do something special that a particular
system needs. Sometimes it is totally obvious that such changes would system needs. Sometimes it is totally obvious that such changes would
break GNU CC for almost all users. We can't possibly make a change like break GCC for almost all users. We can't possibly make a change like
that. At best it might tell us how to write another patch that would that. At best it might tell us how to write another patch that would
solve the problem acceptably. solve the problem acceptably.
...@@ -2652,9 +2656,9 @@ form that is good to install. ...@@ -2652,9 +2656,9 @@ form that is good to install.
@end itemize @end itemize
@node Service @node Service
@chapter How To Get Help with GNU CC @chapter How To Get Help with GCC
If you need help installing, using or changing GNU CC, there are two If you need help installing, using or changing GCC, there are two
ways to find it: ways to find it:
@itemize @bullet @itemize @bullet
...@@ -2666,34 +2670,34 @@ Send a message to a suitable network mailing list. First try ...@@ -2666,34 +2670,34 @@ Send a message to a suitable network mailing list. First try
@item @item
Look in the service directory for someone who might help you for a fee. Look in the service directory for someone who might help you for a fee.
The service directory is found in the file named @file{SERVICE} in the The service directory is found in the file named @file{SERVICE} in the
GNU CC distribution. GCC distribution.
@end itemize @end itemize
@node Contributing @node Contributing
@chapter Contributing to GNU CC Development @chapter Contributing to GCC Development
If you would like to help pretest GNU CC releases to assure they work If you would like to help pretest GCC releases to assure they work
well, or if you would like to work on improving GNU CC, please contact well, or if you would like to work on improving GCC, please contact
the maintainers at @code{gcc@@gcc.gnu.org}. A pretester should the maintainers at @code{egcs@@egcs.cygnus.com}. A pretester should
be willing to try to investigate bugs as well as report them. be willing to try to investigate bugs as well as report them.
If you'd like to work on improvements, please ask for suggested projects If you'd like to work on improvements, please ask for suggested projects
or suggest your own ideas. If you have already written an improvement, or suggest your own ideas. If you have already written an improvement,
please tell us about it. If you have not yet started work, it is useful please tell us about it. If you have not yet started work, it is useful
to contact @code{gcc@@gcc.gnu.org} before you start; the to contact @code{egcs@@egcs.cygnus.com} before you start; the
maintainers may be able to suggest ways to make your extension fit in maintainers may be able to suggest ways to make your extension fit in
better with the rest of GNU CC and with other development plans. better with the rest of GCC and with other development plans.
@node VMS @node VMS
@chapter Using GNU CC on VMS @chapter Using GCC on VMS
@c prevent bad page break with this line @c prevent bad page break with this line
Here is how to use GNU CC on VMS. Here is how to use GCC on VMS.
@menu @menu
* Include Files and VMS:: Where the preprocessor looks for the include files. * Include Files and VMS:: Where the preprocessor looks for the include files.
* Global Declarations:: How to do globaldef, globalref and globalvalue with * Global Declarations:: How to do globaldef, globalref and globalvalue with
GNU CC. GCC.
* VMS Misc:: Misc information. * VMS Misc:: Misc information.
@end menu @end menu
...@@ -2703,11 +2707,11 @@ Here is how to use GNU CC on VMS. ...@@ -2703,11 +2707,11 @@ Here is how to use GNU CC on VMS.
@cindex include files and VMS @cindex include files and VMS
@cindex VMS and include files @cindex VMS and include files
@cindex header files and VMS @cindex header files and VMS
Due to the differences between the filesystems of Unix and VMS, GNU CC Due to the differences between the filesystems of Unix and VMS, GCC
attempts to translate file names in @samp{#include} into names that VMS attempts to translate file names in @samp{#include} into names that VMS
will understand. The basic strategy is to prepend a prefix to the will understand. The basic strategy is to prepend a prefix to the
specification of the include file, convert the whole filename to a VMS specification of the include file, convert the whole filename to a VMS
filename, and then try to open the file. GNU CC tries various prefixes filename, and then try to open the file. GCC tries various prefixes
one by one until one of them succeeds: one by one until one of them succeeds:
@enumerate @enumerate
...@@ -2751,9 +2755,9 @@ Include directives of the form: ...@@ -2751,9 +2755,9 @@ Include directives of the form:
@end example @end example
@noindent @noindent
are a common source of incompatibility between VAX-C and GNU CC. VAX-C are a common source of incompatibility between VAX-C and GCC. VAX-C
treats this much like a standard @code{#include <foobar.h>} directive. treats this much like a standard @code{#include <foobar.h>} directive.
That is incompatible with the ANSI C behavior implemented by GNU CC: to That is incompatible with the ANSI C behavior implemented by GCC: to
expand the name @code{foobar} as a macro. Macro expansion should expand the name @code{foobar} as a macro. Macro expansion should
eventually yield one of the two standard formats for @code{#include}: eventually yield one of the two standard formats for @code{#include}:
...@@ -2782,17 +2786,17 @@ Another source of incompatibility is that VAX-C assumes that: ...@@ -2782,17 +2786,17 @@ Another source of incompatibility is that VAX-C assumes that:
@end example @end example
@noindent @noindent
is actually asking for the file @file{foobar.h}. GNU CC does not is actually asking for the file @file{foobar.h}. GCC does not
make this assumption, and instead takes what you ask for literally; make this assumption, and instead takes what you ask for literally;
it tries to read the file @file{foobar}. The best way to avoid this it tries to read the file @file{foobar}. The best way to avoid this
problem is to always specify the desired file extension in your include problem is to always specify the desired file extension in your include
directives. directives.
GNU CC for VMS is distributed with a set of include files that is GCC for VMS is distributed with a set of include files that is
sufficient to compile most general purpose programs. Even though the sufficient to compile most general purpose programs. Even though the
GNU CC distribution does not contain header files to define constants GCC distribution does not contain header files to define constants
and structures for some VMS system-specific functions, there is no and structures for some VMS system-specific functions, there is no
reason why you cannot use GNU CC with any of these functions. You first reason why you cannot use GCC with any of these functions. You first
may have to generate or create header files, either by using the public may have to generate or create header files, either by using the public
domain utility @code{UNSDL} (which can be found on a DECUS tape), or by domain utility @code{UNSDL} (which can be found on a DECUS tape), or by
extracting the relevant modules from one of the system macro libraries, extracting the relevant modules from one of the system macro libraries,
...@@ -2809,7 +2813,7 @@ whether explicitly, or implicitly via a logical name. ...@@ -2809,7 +2813,7 @@ whether explicitly, or implicitly via a logical name.
@findex GLOBALDEF @findex GLOBALDEF
@findex GLOBALVALUEDEF @findex GLOBALVALUEDEF
@findex GLOBALVALUEREF @findex GLOBALVALUEREF
GNU CC does not provide the @code{globalref}, @code{globaldef} and GCC does not provide the @code{globalref}, @code{globaldef} and
@code{globalvalue} keywords of VAX-C. You can get the same effect with @code{globalvalue} keywords of VAX-C. You can get the same effect with
an obscure feature of GAS, the GNU assembler. (This requires GAS an obscure feature of GAS, the GNU assembler. (This requires GAS
version 1.39 or later.) The following macros allow you to use this version 1.39 or later.) The following macros allow you to use this
...@@ -2928,19 +2932,19 @@ enum globaldef color @{RED, BLUE, GREEN = 3@}; ...@@ -2928,19 +2932,19 @@ enum globaldef color @{RED, BLUE, GREEN = 3@};
@cindex exit status and VMS @cindex exit status and VMS
@cindex return value of @code{main} @cindex return value of @code{main}
@cindex @code{main} and the exit status @cindex @code{main} and the exit status
GNU CC automatically arranges for @code{main} to return 1 by default if GCC automatically arranges for @code{main} to return 1 by default if
you fail to specify an explicit return value. This will be interpreted you fail to specify an explicit return value. This will be interpreted
by VMS as a status code indicating a normal successful completion. by VMS as a status code indicating a normal successful completion.
Version 1 of GNU CC did not provide this default. Version 1 of GCC did not provide this default.
GNU CC on VMS works only with the GNU assembler, GAS. You need version GCC on VMS works only with the GNU assembler, GAS. You need version
1.37 or later of GAS in order to produce value debugging information for 1.37 or later of GAS in order to produce value debugging information for
the VMS debugger. Use the ordinary VMS linker with the object files the VMS debugger. Use the ordinary VMS linker with the object files
produced by GAS. produced by GAS.
@cindex shared VMS run time system @cindex shared VMS run time system
@cindex @file{VAXCRTL} @cindex @file{VAXCRTL}
Under previous versions of GNU CC, the generated code would occasionally Under previous versions of GCC, the generated code would occasionally
give strange results when linked to the sharable @file{VAXCRTL} library. give strange results when linked to the sharable @file{VAXCRTL} library.
Now this should work. Now this should work.
...@@ -2957,10 +2961,10 @@ placed in writable storage. ...@@ -2957,10 +2961,10 @@ placed in writable storage.
Although the VMS linker does distinguish between upper and lower case Although the VMS linker does distinguish between upper and lower case
letters in global symbols, most VMS compilers convert all such symbols letters in global symbols, most VMS compilers convert all such symbols
into upper case and most run-time library routines also have upper case into upper case and most run-time library routines also have upper case
names. To be able to reliably call such routines, GNU CC (by means of names. To be able to reliably call such routines, GCC (by means of
the assembler GAS) converts global symbols into upper case like other the assembler GAS) converts global symbols into upper case like other
VMS compilers. However, since the usual practice in C is to distinguish VMS compilers. However, since the usual practice in C is to distinguish
case, GNU CC (via GAS) tries to preserve usual C behavior by augmenting case, GCC (via GAS) tries to preserve usual C behavior by augmenting
each name that is not all lower case. This means truncating the name each name that is not all lower case. This means truncating the name
to at most 23 characters and then adding more characters at the end to at most 23 characters and then adding more characters at the end
which encode the case pattern of those 23. Names which contain at which encode the case pattern of those 23. Names which contain at
...@@ -3014,16 +3018,16 @@ number of changes to your source code. ...@@ -3014,16 +3018,16 @@ number of changes to your source code.
@ifset INTERNALS @ifset INTERNALS
@node Portability @node Portability
@chapter GNU CC and Portability @chapter GCC and Portability
@cindex portability @cindex portability
@cindex GNU CC and portability @cindex GCC and portability
The main goal of GNU CC was to make a good, fast compiler for machines in The main goal of GCC was to make a good, fast compiler for machines in
the class that the GNU system aims to run on: 32-bit machines that address the class that the GNU system aims to run on: 32-bit machines that address
8-bit bytes and have several general registers. Elegance, theoretical 8-bit bytes and have several general registers. Elegance, theoretical
power and simplicity are only secondary. power and simplicity are only secondary.
GNU CC gets most of the information about the target machine from a machine GCC gets most of the information about the target machine from a machine
description which gives an algebraic formula for each of the machine's description which gives an algebraic formula for each of the machine's
instructions. This is a very clean way to describe the target. But when instructions. This is a very clean way to describe the target. But when
the compiler needs information that is difficult to express in this the compiler needs information that is difficult to express in this
...@@ -3034,7 +3038,7 @@ on the compiler; it was not of interest for its own sake. ...@@ -3034,7 +3038,7 @@ on the compiler; it was not of interest for its own sake.
@cindex endianness @cindex endianness
@cindex autoincrement addressing, availability @cindex autoincrement addressing, availability
@findex abort @findex abort
GNU CC does not contain machine dependent code, but it does contain code GCC does not contain machine dependent code, but it does contain code
that depends on machine parameters such as endianness (whether the most that depends on machine parameters such as endianness (whether the most
significant byte has the highest or lowest address of the bytes in a word) significant byte has the highest or lowest address of the bytes in a word)
and the availability of autoincrement addressing. In the RTL-generation and the availability of autoincrement addressing. In the RTL-generation
...@@ -3050,13 +3054,13 @@ affect only the target machines that need them. ...@@ -3050,13 +3054,13 @@ affect only the target machines that need them.
@ifset INTERNALS @ifset INTERNALS
@node Interface @node Interface
@chapter Interfacing to GNU CC Output @chapter Interfacing to GCC Output
@cindex interfacing to GNU CC output @cindex interfacing to GCC output
@cindex run-time conventions @cindex run-time conventions
@cindex function call conventions @cindex function call conventions
@cindex conventions, run-time @cindex conventions, run-time
GNU CC is normally configured to use the same function calling convention GCC is normally configured to use the same function calling convention
normally in use on the target system. This is done with the normally in use on the target system. This is done with the
machine-description macros described (@pxref{Target Macros}). machine-description macros described (@pxref{Target Macros}).
...@@ -3065,43 +3069,43 @@ machine-description macros described (@pxref{Target Macros}). ...@@ -3065,43 +3069,43 @@ machine-description macros described (@pxref{Target Macros}).
@cindex returning structures and unions @cindex returning structures and unions
However, returning of structure and union values is done differently on However, returning of structure and union values is done differently on
some target machines. As a result, functions compiled with PCC some target machines. As a result, functions compiled with PCC
returning such types cannot be called from code compiled with GNU CC, returning such types cannot be called from code compiled with GCC,
and vice versa. This does not cause trouble often because few Unix and vice versa. This does not cause trouble often because few Unix
library routines return structures or unions. library routines return structures or unions.
GNU CC code returns structures and unions that are 1, 2, 4 or 8 bytes GCC code returns structures and unions that are 1, 2, 4 or 8 bytes
long in the same registers used for @code{int} or @code{double} return long in the same registers used for @code{int} or @code{double} return
values. (GNU CC typically allocates variables of such types in values. (GCC typically allocates variables of such types in
registers also.) Structures and unions of other sizes are returned by registers also.) Structures and unions of other sizes are returned by
storing them into an address passed by the caller (usually in a storing them into an address passed by the caller (usually in a
register). The machine-description macros @code{STRUCT_VALUE} and register). The machine-description macros @code{STRUCT_VALUE} and
@code{STRUCT_INCOMING_VALUE} tell GNU CC where to pass this address. @code{STRUCT_INCOMING_VALUE} tell GCC where to pass this address.
By contrast, PCC on most target machines returns structures and unions By contrast, PCC on most target machines returns structures and unions
of any size by copying the data into an area of static storage, and then of any size by copying the data into an area of static storage, and then
returning the address of that storage as if it were a pointer value. returning the address of that storage as if it were a pointer value.
The caller must copy the data from that memory area to the place where The caller must copy the data from that memory area to the place where
the value is wanted. This is slower than the method used by GNU CC, and the value is wanted. This is slower than the method used by GCC, and
fails to be reentrant. fails to be reentrant.
On some target machines, such as RISC machines and the 80386, the On some target machines, such as RISC machines and the 80386, the
standard system convention is to pass to the subroutine the address of standard system convention is to pass to the subroutine the address of
where to return the value. On these machines, GNU CC has been where to return the value. On these machines, GCC has been
configured to be compatible with the standard compiler, when this method configured to be compatible with the standard compiler, when this method
is used. It may not be compatible for structures of 1, 2, 4 or 8 bytes. is used. It may not be compatible for structures of 1, 2, 4 or 8 bytes.
@cindex argument passing @cindex argument passing
@cindex passing arguments @cindex passing arguments
GNU CC uses the system's standard convention for passing arguments. On GCC uses the system's standard convention for passing arguments. On
some machines, the first few arguments are passed in registers; in some machines, the first few arguments are passed in registers; in
others, all are passed on the stack. It would be possible to use others, all are passed on the stack. It would be possible to use
registers for argument passing on any machine, and this would probably registers for argument passing on any machine, and this would probably
result in a significant speedup. But the result would be complete result in a significant speedup. But the result would be complete
incompatibility with code that follows the standard convention. So this incompatibility with code that follows the standard convention. So this
change is practical only if you are switching to GNU CC as the sole C change is practical only if you are switching to GCC as the sole C
compiler for the system. We may implement register argument passing on compiler for the system. We may implement register argument passing on
certain machines once we have a complete GNU system so that we can certain machines once we have a complete GNU system so that we can
compile the libraries with GNU CC. compile the libraries with GCC.
On some machines (particularly the Sparc), certain types of arguments On some machines (particularly the Sparc), certain types of arguments
are passed ``by invisible reference''. This means that the value is are passed ``by invisible reference''. This means that the value is
...@@ -3111,9 +3115,9 @@ the subroutine. ...@@ -3111,9 +3115,9 @@ the subroutine.
@cindex @code{longjmp} and automatic variables @cindex @code{longjmp} and automatic variables
If you use @code{longjmp}, beware of automatic variables. ANSI C says that If you use @code{longjmp}, beware of automatic variables. ANSI C says that
automatic variables that are not declared @code{volatile} have undefined automatic variables that are not declared @code{volatile} have undefined
values after a @code{longjmp}. And this is all GNU CC promises to do, values after a @code{longjmp}. And this is all GCC promises to do,
because it is very difficult to restore register variables correctly, and because it is very difficult to restore register variables correctly, and
one of GNU CC's features is that it can put variables in registers without one of GCC's features is that it can put variables in registers without
your asking it to. your asking it to.
If you want a variable to be unaltered by @code{longjmp}, and you don't If you want a variable to be unaltered by @code{longjmp}, and you don't
...@@ -3132,7 +3136,7 @@ go in a register: ...@@ -3132,7 +3136,7 @@ go in a register:
@cindex arithmetic libraries @cindex arithmetic libraries
@cindex math libraries @cindex math libraries
Code compiled with GNU CC may call certain library routines. Most of Code compiled with GCC may call certain library routines. Most of
them handle arithmetic for which there are no instructions. This them handle arithmetic for which there are no instructions. This
includes multiply and divide on some machines, and floating point includes multiply and divide on some machines, and floating point
operations on any machine for which floating point support is disabled operations on any machine for which floating point support is disabled
...@@ -3141,7 +3145,7 @@ with @samp{-msoft-float}. Some standard parts of the C library, such as ...@@ -3141,7 +3145,7 @@ with @samp{-msoft-float}. Some standard parts of the C library, such as
function call interface is used for calling the library routines. function call interface is used for calling the library routines.
These library routines should be defined in the library @file{libgcc.a}, These library routines should be defined in the library @file{libgcc.a},
which GNU CC automatically searches whenever it links a program. On which GCC automatically searches whenever it links a program. On
machines that have multiply and divide instructions, if hardware machines that have multiply and divide instructions, if hardware
floating point is in use, normally @file{libgcc.a} is not needed, but it floating point is in use, normally @file{libgcc.a} is not needed, but it
is searched just in case. is searched just in case.
...@@ -3150,7 +3154,7 @@ Each arithmetic function is defined in @file{libgcc1.c} to use the ...@@ -3150,7 +3154,7 @@ Each arithmetic function is defined in @file{libgcc1.c} to use the
corresponding C arithmetic operator. As long as the file is compiled corresponding C arithmetic operator. As long as the file is compiled
with another C compiler, which supports all the C arithmetic operators, with another C compiler, which supports all the C arithmetic operators,
this file will work portably. However, @file{libgcc1.c} does not work if this file will work portably. However, @file{libgcc1.c} does not work if
compiled with GNU CC, because each arithmetic function would compile compiled with GCC, because each arithmetic function would compile
into a call to itself! into a call to itself!
@end ifset @end ifset
...@@ -3305,7 +3309,7 @@ function must meet certain criteria, currently related to the size of ...@@ -3305,7 +3309,7 @@ function must meet certain criteria, currently related to the size of
the function and the types and number of parameters it has. Note that the function and the types and number of parameters it has. Note that
this function may contain loops, recursive calls to itself this function may contain loops, recursive calls to itself
(tail-recursive functions can be inlined!), gotos, in short, all (tail-recursive functions can be inlined!), gotos, in short, all
constructs supported by GNU CC. The file @file{integrate.c} contains constructs supported by GCC. The file @file{integrate.c} contains
the code to save a function's rtl for later inlining and to inline that the code to save a function's rtl for later inlining and to inline that
rtl when the function is called. The header file @file{integrate.h} rtl when the function is called. The header file @file{integrate.h}
is also used for this purpose. is also used for this purpose.
...@@ -3665,7 +3669,7 @@ definitions that describe the machine and system on which the compiler ...@@ -3665,7 +3669,7 @@ definitions that describe the machine and system on which the compiler
is running, unlike the definitions in @file{@var{machine}.h}, which is running, unlike the definitions in @file{@var{machine}.h}, which
describe the machine for which the compiler is producing output. Most describe the machine for which the compiler is producing output. Most
of the values in @file{xm-@var{machine}.h} are actually the same on all of the values in @file{xm-@var{machine}.h} are actually the same on all
machines that GNU CC runs on, so large parts of all configuration files machines that GCC runs on, so large parts of all configuration files
are identical. But there are some macros that vary: are identical. But there are some macros that vary:
@table @code @table @code
...@@ -3690,7 +3694,7 @@ exits without serious errors. ...@@ -3690,7 +3694,7 @@ exits without serious errors.
@findex HOST_WORDS_BIG_ENDIAN @findex HOST_WORDS_BIG_ENDIAN
@item HOST_WORDS_BIG_ENDIAN @item HOST_WORDS_BIG_ENDIAN
Defined if the host machine stores words of multi-word values in Defined if the host machine stores words of multi-word values in
big-endian order. (GNU CC does not depend on the host byte ordering big-endian order. (GCC does not depend on the host byte ordering
within a word.) within a word.)
@findex HOST_FLOAT_WORDS_BIG_ENDIAN @findex HOST_FLOAT_WORDS_BIG_ENDIAN
...@@ -3769,7 +3773,7 @@ If you do define this macro, you should probably do it as follows: ...@@ -3769,7 +3773,7 @@ If you do define this macro, you should probably do it as follows:
@end example @end example
@noindent @noindent
so that when the compiler is compiled with GNU CC it uses the more so that when the compiler is compiled with GCC it uses the more
efficient built-in @code{alloca} function. efficient built-in @code{alloca} function.
@item FUNCTION_CONVERSION_BUG @item FUNCTION_CONVERSION_BUG
...@@ -3781,7 +3785,7 @@ used in an expression. ...@@ -3781,7 +3785,7 @@ used in an expression.
@findex MULTIBYTE_CHARS @findex MULTIBYTE_CHARS
@item MULTIBYTE_CHARS @item MULTIBYTE_CHARS
Define this macro to enable support for multibyte characters in the Define this macro to enable support for multibyte characters in the
input to GNU CC. This requires that the host system support the ANSI C input to GCC. This requires that the host system support the ANSI C
library functions for converting multibyte characters to wide library functions for converting multibyte characters to wide
characters. characters.
...@@ -3812,7 +3816,7 @@ Therefore, if you define @code{sys_siglist}, you should also define ...@@ -3812,7 +3816,7 @@ Therefore, if you define @code{sys_siglist}, you should also define
Define this to be 1 if you know that the host compiler supports Define this to be 1 if you know that the host compiler supports
prototypes, even if it doesn't define __STDC__, or define prototypes, even if it doesn't define __STDC__, or define
it to be 0 if you do not want any prototypes used in compiling it to be 0 if you do not want any prototypes used in compiling
GNU CC. If @samp{USE_PROTOTYPES} is not defined, it will be GCC. If @samp{USE_PROTOTYPES} is not defined, it will be
determined automatically whether your compiler supports determined automatically whether your compiler supports
prototypes by checking if @samp{__STDC__} is defined. prototypes by checking if @samp{__STDC__} is defined.
...@@ -3820,7 +3824,7 @@ prototypes by checking if @samp{__STDC__} is defined. ...@@ -3820,7 +3824,7 @@ prototypes by checking if @samp{__STDC__} is defined.
@item NO_MD_PROTOTYPES @item NO_MD_PROTOTYPES
Define this if you wish suppression of prototypes generated from Define this if you wish suppression of prototypes generated from
the machine description file, but to use other prototypes within the machine description file, but to use other prototypes within
GNU CC. If @samp{USE_PROTOTYPES} is defined to be 0, or the GCC. If @samp{USE_PROTOTYPES} is defined to be 0, or the
host compiler does not support prototypes, this macro has no host compiler does not support prototypes, this macro has no
effect. effect.
...@@ -3845,20 +3849,20 @@ the colon character ...@@ -3845,20 +3849,20 @@ the colon character
@item DIR_SEPARATOR @item DIR_SEPARATOR
If your system uses some character other than slash to separate If your system uses some character other than slash to separate
directory names within a file specification, define this macro to be a C directory names within a file specification, define this macro to be a C
character constant specifying that character. When GNU CC displays file character constant specifying that character. When GCC displays file
names, the character you specify will be used. GNU CC will test for names, the character you specify will be used. GCC will test for
both slash and the character you specify when parsing filenames. both slash and the character you specify when parsing filenames.
@findex OBJECT_SUFFIX @findex OBJECT_SUFFIX
@item OBJECT_SUFFIX @item OBJECT_SUFFIX
Define this macro to be a C string representing the suffix for object Define this macro to be a C string representing the suffix for object
files on your machine. If you do not define this macro, GNU CC will use files on your machine. If you do not define this macro, GCC will use
@samp{.o} as the suffix for object files. @samp{.o} as the suffix for object files.
@findex EXECUTABLE_SUFFIX @findex EXECUTABLE_SUFFIX
@item EXECUTABLE_SUFFIX @item EXECUTABLE_SUFFIX
Define this macro to be a C string representing the suffix for executable Define this macro to be a C string representing the suffix for executable
files on your machine. If you do not define this macro, GNU CC will use files on your machine. If you do not define this macro, GCC will use
the null string as the suffix for object files. the null string as the suffix for object files.
@findex COLLECT_EXPORT_LIST @findex COLLECT_EXPORT_LIST
...@@ -3874,14 +3878,14 @@ lists. ...@@ -3874,14 +3878,14 @@ lists.
@findex bcmp @findex bcmp
In addition, configuration files for system V define @code{bcopy}, In addition, configuration files for system V define @code{bcopy},
@code{bzero} and @code{bcmp} as aliases. Some files define @code{alloca} @code{bzero} and @code{bcmp} as aliases. Some files define @code{alloca}
as a macro when compiled with GNU CC, in order to take advantage of the as a macro when compiled with GCC, in order to take advantage of the
benefit of GNU CC's built-in @code{alloca}. benefit of GCC's built-in @code{alloca}.
@node Fragments @node Fragments
@chapter Makefile Fragments @chapter Makefile Fragments
@cindex makefile fragment @cindex makefile fragment
When you configure GNU CC using the @file{configure} script When you configure GCC using the @file{configure} script
(@pxref{Installation}), it will construct the file @file{Makefile} from (@pxref{Installation}), it will construct the file @file{Makefile} from
the template file @file{Makefile.in}. When it does this, it will the template file @file{Makefile.in}. When it does this, it will
incorporate makefile fragment files from the @file{config} directory, incorporate makefile fragment files from the @file{config} directory,
...@@ -3939,11 +3943,11 @@ in @code{EXTRA-PARTS}. ...@@ -3939,11 +3943,11 @@ in @code{EXTRA-PARTS}.
@findex MULTILIB_OPTIONS @findex MULTILIB_OPTIONS
@item MULTILIB_OPTIONS @item MULTILIB_OPTIONS
For some targets, invoking GNU CC in different ways produces objects For some targets, invoking GCC in different ways produces objects
that can not be linked together. For example, for some targets GNU CC that can not be linked together. For example, for some targets GCC
produces both big and little endian code. For these targets, you must produces both big and little endian code. For these targets, you must
arrange for multiple versions of @file{libgcc.a} to be compiled, one for arrange for multiple versions of @file{libgcc.a} to be compiled, one for
each set of incompatible options. When GNU CC invokes the linker, it each set of incompatible options. When GCC invokes the linker, it
arranges to link in the right version of @file{libgcc.a}, based on arranges to link in the right version of @file{libgcc.a}, based on
the command line options used. the command line options used.
...@@ -3976,7 +3980,7 @@ you desire a different set of directory names. ...@@ -3976,7 +3980,7 @@ you desire a different set of directory names.
@findex MULTILIB_MATCHES @findex MULTILIB_MATCHES
@item MULTILIB_MATCHES @item MULTILIB_MATCHES
Sometimes the same option may be written in two different ways. If an Sometimes the same option may be written in two different ways. If an
option is listed in @code{MULTILIB_OPTIONS}, GNU CC needs to know about option is listed in @code{MULTILIB_OPTIONS}, GCC needs to know about
any synonyms. In that case, set @code{MULTILIB_MATCHES} to a list of any synonyms. In that case, set @code{MULTILIB_MATCHES} to a list of
items of the form @samp{option=option} to describe all relevant items of the form @samp{option=option} to describe all relevant
synonyms. For example, @samp{m68000=mc68000 m68020=mc68020}. synonyms. For example, @samp{m68000=mc68000 m68020=mc68020}.
...@@ -4070,7 +4074,7 @@ difference than others. For example, maintaining a separate version of ...@@ -4070,7 +4074,7 @@ difference than others. For example, maintaining a separate version of
a program contributes very little; maintaining the standard version of a a program contributes very little; maintaining the standard version of a
program for the whole community contributes much. Easy new ports program for the whole community contributes much. Easy new ports
contribute little, since someone else would surely do them; difficult contribute little, since someone else would surely do them; difficult
ports such as adding a new CPU to the GNU C compiler contribute more; ports such as adding a new CPU to the GNU Compiler Collection contribute more;
major new features or packages contribute the most. major new features or packages contribute the most.
By establishing the idea that supporting further development is ``the By establishing the idea that supporting further development is ``the
...@@ -4520,7 +4524,7 @@ the ``copyright'' line and a pointer to where the full notice is found. ...@@ -4520,7 +4524,7 @@ the ``copyright'' line and a pointer to where the full notice is found.
@smallexample @smallexample
@var{one line to give the program's name and a brief idea of what it does.} @var{one line to give the program's name and a brief idea of what it does.}
Copyright (C) 19@var{yy} @var{name of author} Copyright (C) @var{yyyy} @var{name of author}
This program is free software; you can redistribute it and/or modify This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by it under the terms of the GNU General Public License as published by
...@@ -4543,7 +4547,7 @@ If the program is interactive, make it output a short notice like this ...@@ -4543,7 +4547,7 @@ If the program is interactive, make it output a short notice like this
when it starts in an interactive mode: when it starts in an interactive mode:
@smallexample @smallexample
Gnomovision version 69, Copyright (C) 19@var{yy} @var{name of author} Gnomovision version 69, Copyright (C) @var{yyyy} @var{name of author}
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details Gnomovision comes with ABSOLUTELY NO WARRANTY; for details
type `show w'. type `show w'.
This is free software, and you are welcome to redistribute it This is free software, and you are welcome to redistribute it
...@@ -4575,11 +4579,11 @@ library. If this is what you want to do, use the GNU Library General ...@@ -4575,11 +4579,11 @@ library. If this is what you want to do, use the GNU Library General
Public License instead of this License. Public License instead of this License.
@node Contributors @node Contributors
@unnumbered Contributors to GNU CC @unnumbered Contributors to GCC
@cindex contributors @cindex contributors
In addition to Richard Stallman, several people have written parts In addition to Richard Stallman, several people have written parts
of GNU CC. of GCC.
@itemize @bullet @itemize @bullet
@item @item
...@@ -4631,13 +4635,13 @@ Randy Smith finished the Sun FPA support. ...@@ -4631,13 +4635,13 @@ Randy Smith finished the Sun FPA support.
Robert Brown implemented the support for Encore 32000 systems. Robert Brown implemented the support for Encore 32000 systems.
@item @item
David Kashtan of SRI adapted GNU CC to VMS. David Kashtan of SRI adapted GCC to VMS.
@item @item
Alex Crain provided changes for the 3b1. Alex Crain provided changes for the 3b1.
@item @item
Greg Satz and Chris Hanson assisted in making GNU CC work on HP-UX for Greg Satz and Chris Hanson assisted in making GCC work on HP-UX for
the 9000 series 300. the 9000 series 300.
@item @item
...@@ -4654,16 +4658,16 @@ Dario Dariol contributed the four varieties of sample programs ...@@ -4654,16 +4658,16 @@ Dario Dariol contributed the four varieties of sample programs
that print a copy of their source. that print a copy of their source.
@item @item
Alain Lichnewsky ported GNU CC to the Mips cpu. Alain Lichnewsky ported GCC to the Mips cpu.
@item @item
Devon Bowen, Dale Wiles and Kevin Zachmann ported GNU CC to the Tahoe. Devon Bowen, Dale Wiles and Kevin Zachmann ported GCC to the Tahoe.
@item @item
Jonathan Stone wrote the machine description for the Pyramid computer. Jonathan Stone wrote the machine description for the Pyramid computer.
@item @item
Gary Miller ported GNU CC to Charles River Data Systems machines. Gary Miller ported GCC to Charles River Data Systems machines.
@item @item
Richard Kenner of the New York University Ultracomputer Research Richard Kenner of the New York University Ultracomputer Research
......
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