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Commit 49e19725 by Toon Moene Committed by Toon Moene
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g77.texi: Update to use `@command', `@option. 

2001-11-14  Toon Moene  <toon@moene.indiv.nluug.nl>

	* g77.texi: Update to use `@command', `@option.
	* invoke.texi: Ditto

From-SVN: r47034
parent 6c5a8271
Showing with 222 additions and 219 deletions
gcc/f/ChangeLog
2001-11-14 Toon Moene <toon@moene.indiv.nluug.nl>
* g77.texi: Update to use `@command', `@option.
* invoke.texi: Ditto
2001-11-14 Joseph S. Myers <jsm28@cam.ac.uk> 2001-11-14 Joseph S. Myers <jsm28@cam.ac.uk>
* Make-lang.in: Change all uses of $(manext) to $(man1ext). * Make-lang.in: Change all uses of $(manext) to $(man1ext).
......
gcc/f/g77.texi
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gcc/f/invoke.texi
...@@ -30,7 +30,7 @@ included in the gfdl(7) man page. ...@@ -30,7 +30,7 @@ included in the gfdl(7) man page.
@setfilename g77 @setfilename g77
@settitle GNU project Fortran 77 compiler. @settitle GNU project Fortran 77 compiler.
@c man begin SYNOPSIS @c man begin SYNOPSIS
g77 [@option{-c}|@option{-S}|@option{-E}] [@option{-std=}@var{standard}] g77 [@option{-c}|@option{-S}|@option{-E}]
[@option{-g}] [@option{-pg}] [@option{-O}@var{level}] [@option{-g}] [@option{-pg}] [@option{-O}@var{level}]
[@option{-W}@var{warn}@dots{}] [@option{-pedantic}] [@option{-W}@var{warn}@dots{}] [@option{-pedantic}]
[@option{-I}@var{dir}@dots{}] [@option{-L}@var{dir}@dots{}] [@option{-I}@var{dir}@dots{}] [@option{-L}@var{dir}@dots{}]
...@@ -54,7 +54,7 @@ script to report bugs is recommended. ...@@ -54,7 +54,7 @@ script to report bugs is recommended.
@c man end @c man end
@c man begin AUTHOR @c man begin AUTHOR
See the Info entry for @file{g77}, or See the Info entry for @file{g77}, or
@w{@uref{http://gcc.gnu.org/thanks.html}}, for contributors to G77@. @w{@uref{http://gcc.gnu.org/thanks.html}}, for contributors to GCC and G77@.
@c man end @c man end
@end ignore @end ignore
...@@ -66,32 +66,32 @@ See the Info entry for @file{g77}, or ...@@ -66,32 +66,32 @@ See the Info entry for @file{g77}, or
@c man begin DESCRIPTION @c man begin DESCRIPTION
The @code{g77} command supports all the options supported by the The @command{g77} command supports all the options supported by the
@code{gcc} command. @command{gcc} command.
@xref{Invoking GCC,,GNU CC Command Options,gcc,Using and Porting GNU CC}, @xref{Invoking GCC,,GNU CC Command Options,gcc,Using and Porting GNU CC},
for information for information
on the non-Fortran-specific aspects of the @code{gcc} command (and, on the non-Fortran-specific aspects of the @command{gcc} command (and,
therefore, the @code{g77} command). therefore, the @command{g77} command).
@cindex options, negative forms @cindex options, negative forms
@cindex negative forms of options @cindex negative forms of options
All @code{gcc} and @code{g77} options All @command{gcc} and @command{g77} options
are accepted both by @code{g77} and by @code{gcc} are accepted both by @command{g77} and by @command{gcc}
(as well as any other drivers built at the same time, (as well as any other drivers built at the same time,
such as @code{g++}), such as @code{g++}),
since adding @code{g77} to the @code{gcc} distribution since adding @command{g77} to the @command{gcc} distribution
enables acceptance of @code{g77}-specific options enables acceptance of @command{g77} options
by all of the relevant drivers. by all of the relevant drivers.
In some cases, options have positive and negative forms; In some cases, options have positive and negative forms;
the negative form of @samp{-ffoo} would be @samp{-fno-foo}. the negative form of @option{-ffoo} would be @option{-fno-foo}.
This manual documents only one of these two forms, whichever This manual documents only one of these two forms, whichever
one is not the default. one is not the default.
@c man end @c man end
@menu @menu
* Option Summary:: Brief list of all @code{g77} options, * Option Summary:: Brief list of all @command{g77} options,
without explanations. without explanations.
* Overall Options:: Controlling the kind of output: * Overall Options:: Controlling the kind of output:
an executable, object files, assembler files, an executable, object files, assembler files,
...@@ -122,19 +122,17 @@ by type. Explanations are in the following sections. ...@@ -122,19 +122,17 @@ by type. Explanations are in the following sections.
@table @emph @table @emph
@item Overall Options @item Overall Options
@xref{Overall Options,,Options Controlling the Kind of Output}. @xref{Overall Options,,Options Controlling the Kind of Output}.
@smallexample @gccoptlist{
-fversion -fset-g77-defaults -fno-silent -fversion -fset-g77-defaults -fno-silent}
@end smallexample
@item Shorthand Options @item Shorthand Options
@xref{Shorthand Options}. @xref{Shorthand Options}.
@smallexample @gccoptlist{
-ff66 -fno-f66 -ff77 -fno-f77 -fno-ugly -ff66 -fno-f66 -ff77 -fno-f77 -fno-ugly}
@end smallexample
@item Fortran Language Options @item Fortran Language Options
@xref{Fortran Dialect Options,,Options Controlling Fortran Dialect}. @xref{Fortran Dialect Options,,Options Controlling Fortran Dialect}.
@smallexample @gccoptlist{
-ffree-form -fno-fixed-form -ff90 -ffree-form -fno-fixed-form -ff90
-fvxt -fdollar-ok -fno-backslash -fvxt -fdollar-ok -fno-backslash
-fno-ugly-args -fno-ugly-assign -fno-ugly-assumed -fno-ugly-args -fno-ugly-assign -fno-ugly-assumed
...@@ -164,27 +162,24 @@ by type. Explanations are in the following sections. ...@@ -164,27 +162,24 @@ by type. Explanations are in the following sections.
-funix-intrinsics-disable -funix-intrinsics-enable -funix-intrinsics-disable -funix-intrinsics-enable
-fvxt-intrinsics-delete -fvxt-intrinsics-hide -fvxt-intrinsics-delete -fvxt-intrinsics-hide
-fvxt-intrinsics-disable -fvxt-intrinsics-enable -fvxt-intrinsics-disable -fvxt-intrinsics-enable
-ffixed-line-length-@var{n} -ffixed-line-length-none -ffixed-line-length-@var{n} -ffixed-line-length-none}
@end smallexample
@item Warning Options @item Warning Options
@xref{Warning Options,,Options to Request or Suppress Warnings}. @xref{Warning Options,,Options to Request or Suppress Warnings}.
@smallexample @gccoptlist{
-fsyntax-only -pedantic -pedantic-errors -fpedantic -fsyntax-only -pedantic -pedantic-errors -fpedantic
-w -Wno-globals -Wimplicit -Wunused -Wuninitialized -w -Wno-globals -Wimplicit -Wunused -Wuninitialized
-Wall -Wsurprising -Wall -Wsurprising
-Werror -W -Werror -W}
@end smallexample
@item Debugging Options @item Debugging Options
@xref{Debugging Options,,Options for Debugging Your Program or GCC}. @xref{Debugging Options,,Options for Debugging Your Program or GCC}.
@smallexample @gccoptlist{
-g -g}
@end smallexample
@item Optimization Options @item Optimization Options
@xref{Optimize Options,,Options that Control Optimization}. @xref{Optimize Options,,Options that Control Optimization}.
@smallexample @gccoptlist{
-malign-double -malign-double
-ffloat-store -fforce-mem -fforce-addr -fno-inline -ffloat-store -fforce-mem -fforce-addr -fno-inline
-ffast-math -fstrength-reduce -frerun-cse-after-loop -ffast-math -fstrength-reduce -frerun-cse-after-loop
...@@ -193,18 +188,16 @@ by type. Explanations are in the following sections. ...@@ -193,18 +188,16 @@ by type. Explanations are in the following sections.
-fschedule-insns -fschedule-insn2 -fcaller-saves -fschedule-insns -fschedule-insn2 -fcaller-saves
-funroll-loops -funroll-all-loops -funroll-loops -funroll-all-loops
-fno-move-all-movables -fno-reduce-all-givs -fno-move-all-movables -fno-reduce-all-givs
-fno-rerun-loop-opt -fno-rerun-loop-opt}
@end smallexample
@item Directory Options @item Directory Options
@xref{Directory Options,,Options for Directory Search}. @xref{Directory Options,,Options for Directory Search}.
@smallexample @gccoptlist{
-I@var{dir} -I- -I@var{dir} -I-}
@end smallexample
@item Code Generation Options @item Code Generation Options
@xref{Code Gen Options,,Options for Code Generation Conventions}. @xref{Code Gen Options,,Options for Code Generation Conventions}.
@smallexample @gccoptlist{
-fno-automatic -finit-local-zero -fno-f2c -fno-automatic -finit-local-zero -fno-f2c
-ff2c-library -fno-underscoring -fno-ident -ff2c-library -fno-underscoring -fno-ident
-fpcc-struct-return -freg-struct-return -fpcc-struct-return -freg-struct-return
...@@ -214,8 +207,7 @@ by type. Explanations are in the following sections. ...@@ -214,8 +207,7 @@ by type. Explanations are in the following sections.
-falias-check -fargument-alias -falias-check -fargument-alias
-fargument-noalias -fno-argument-noalias-global -fargument-noalias -fno-argument-noalias-global
-fno-globals -fflatten-arrays -fno-globals -fflatten-arrays
-fbounds-check -ffortran-bounds-check -fbounds-check -ffortran-bounds-check}
@end smallexample
@end table @end table
@c man end @c man end
...@@ -265,7 +257,7 @@ Suffixes specific to GNU Fortran are listed below. ...@@ -265,7 +257,7 @@ Suffixes specific to GNU Fortran are listed below.
@xref{Overall Options,,gcc,Using and Porting GNU CC}, for @xref{Overall Options,,gcc,Using and Porting GNU CC}, for
information on suffixes recognized by GNU CC. information on suffixes recognized by GNU CC.
@table @code @table @gcctabopt
@cindex .f filename suffix @cindex .f filename suffix
@cindex .for filename suffix @cindex .for filename suffix
@cindex .FOR filename suffix @cindex .FOR filename suffix
...@@ -278,7 +270,7 @@ Such source code cannot contain any preprocessor directives, such ...@@ -278,7 +270,7 @@ Such source code cannot contain any preprocessor directives, such
as @code{#include}, @code{#define}, @code{#if}, and so on. as @code{#include}, @code{#define}, @code{#if}, and so on.
You can force @samp{.f} files to be preprocessed by @code{cpp} by using You can force @samp{.f} files to be preprocessed by @code{cpp} by using
@samp{-x f77-cpp-input}. @option{-x f77-cpp-input}.
@xref{LEX}. @xref{LEX}.
@cindex preprocessor @cindex preprocessor
...@@ -308,7 +300,7 @@ preprocessor directive must be used instead. ...@@ -308,7 +300,7 @@ preprocessor directive must be used instead.
Ratfor source code, which must be preprocessed by the @code{ratfor} Ratfor source code, which must be preprocessed by the @code{ratfor}
command, which is available separately (as it is not yet part of the GNU command, which is available separately (as it is not yet part of the GNU
Fortran distribution). Fortran distribution).
One version in Fortran, adapted for use with @code{g77}, is at One version in Fortran, adapted for use with @command{g77} is at
@uref{ftp://members.aol.com/n8tm/rat7.uue} (of uncertain copyright @uref{ftp://members.aol.com/n8tm/rat7.uue} (of uncertain copyright
status). Another, public domain version in C is at status). Another, public domain version in C is at
@uref{http://sepwww.stanford.edu/sep/prof/ratfor.shar.2}. @uref{http://sepwww.stanford.edu/sep/prof/ratfor.shar.2}.
...@@ -355,7 +347,7 @@ along with the subsequent newline, resulting in the next ...@@ -355,7 +347,7 @@ along with the subsequent newline, resulting in the next
line being effectively commented out---unfortunate if that line being effectively commented out---unfortunate if that
line is a non-comment line of important code! line is a non-comment line of important code!
@emph{Note:} The @samp{-traditional} and @samp{-undef} flags are supplied @emph{Note:} The @option{-traditional} and @option{-undef} flags are supplied
to @code{cpp} by default, to help avoid unpleasant surprises. to @code{cpp} by default, to help avoid unpleasant surprises.
@xref{Preprocessor Options,,Options Controlling the Preprocessor, @xref{Preprocessor Options,,Options Controlling the Preprocessor,
gcc,Using and Porting GNU CC}. gcc,Using and Porting GNU CC}.
...@@ -365,10 +357,10 @@ namespace (generally, names with a leading underscore) are liable to ...@@ -365,10 +357,10 @@ namespace (generally, names with a leading underscore) are liable to
substitution by C predefines. substitution by C predefines.
Thus, if you want to do system-specific Thus, if you want to do system-specific
tests, use, for example, @samp{#ifdef __linux__} rather than @samp{#ifdef linux}. tests, use, for example, @samp{#ifdef __linux__} rather than @samp{#ifdef linux}.
Use the @samp{-v} option to see exactly how the preprocessor is invoked. Use the @option{-v} option to see exactly how the preprocessor is invoked.
@cindex /* @cindex /*
Unfortunately, the @samp{-traditional} flag will not avoid an error from Unfortunately, the @option{-traditional} flag will not avoid an error from
anything that @code{cpp} sees as an unterminated C comment, such as: anything that @code{cpp} sees as an unterminated C comment, such as:
@smallexample @smallexample
C Some Fortran compilers accept /* as starting C Some Fortran compilers accept /* as starting
...@@ -377,9 +369,9 @@ C an inline comment. ...@@ -377,9 +369,9 @@ C an inline comment.
@xref{Trailing Comment}. @xref{Trailing Comment}.
The following options that affect overall processing are recognized The following options that affect overall processing are recognized
by the @code{g77} and @code{gcc} commands in a GNU Fortran installation: by the @command{g77} and @command{gcc} commands in a GNU Fortran installation:
@table @code @table @gcctabopt
@cindex -fversion option @cindex -fversion option
@cindex options, -fversion @cindex options, -fversion
@cindex printing version information @cindex printing version information
...@@ -388,15 +380,18 @@ by the @code{g77} and @code{gcc} commands in a GNU Fortran installation: ...@@ -388,15 +380,18 @@ by the @code{g77} and @code{gcc} commands in a GNU Fortran installation:
@cindex internal consistency checks @cindex internal consistency checks
@cindex checks, of internal consistency @cindex checks, of internal consistency
@item -fversion @item -fversion
Ensure that the @code{g77}-specific version of the compiler phase is reported, Ensure that the @command{g77} version of the compiler phase is reported,
if run, if run,
and, starting in @code{egcs} version 1.1, and, starting in @code{egcs} version 1.1,
that internal consistency checks in the @file{f771} program are run. that internal consistency checks in the @file{f771} program are run.
This option is supplied automatically when @samp{-v} or @samp{--verbose} This option is supplied automatically when @option{-v} or @option{--verbose}
is specified as a command-line option for @code{g77} or @code{gcc} is specified as a command-line option for @command{g77} or @command{gcc}
and when the resulting commands compile Fortran source files. and when the resulting commands compile Fortran source files.
In GCC 3.1, this is changed back to the behaviour @command{gcc} displays
for @samp{.c} files.
@cindex -fset-g77-defaults option @cindex -fset-g77-defaults option
@cindex options, -fset-g77-defaults @cindex options, -fset-g77-defaults
@item -fset-g77-defaults @item -fset-g77-defaults
...@@ -410,12 +405,12 @@ in @file{gcc/gcc/f/com.c}. ...@@ -410,12 +405,12 @@ in @file{gcc/gcc/f/com.c}.
@cindex consistency checks @cindex consistency checks
@cindex internal consistency checks @cindex internal consistency checks
@cindex checks, of internal consistency @cindex checks, of internal consistency
Set up whatever @code{gcc} options are to apply to Fortran Set up whatever @command{gcc} options are to apply to Fortran
compilations, and avoid running internal consistency checks compilations, and avoid running internal consistency checks
that might take some time. that might take some time.
This option is supplied automatically when compiling Fortran code This option is supplied automatically when compiling Fortran code
via the @code{g77} or @code{gcc} command. via the @command{g77} or @command{gcc} command.
The description of this option is provided so that users seeing The description of this option is provided so that users seeing
it in the output of, say, @samp{g77 -v} understand why it is it in the output of, say, @samp{g77 -v} understand why it is
there. there.
...@@ -424,13 +419,13 @@ there. ...@@ -424,13 +419,13 @@ there.
@cindex code, modifying @cindex code, modifying
Also, developers who run @code{f771} directly might want to specify it Also, developers who run @code{f771} directly might want to specify it
by hand to get the same defaults as they would running @code{f771} by hand to get the same defaults as they would running @code{f771}
via @code{g77} or @code{gcc}. via @command{g77} or @command{gcc}
However, such developers should, after linking a new @code{f771} However, such developers should, after linking a new @code{f771}
executable, invoke it without this option once, executable, invoke it without this option once,
e.g. via @kbd{./f771 -quiet < /dev/null}, e.g. via @kbd{./f771 -quiet < /dev/null},
to ensure that they have not introduced any to ensure that they have not introduced any
internal inconsistencies (such as in the table of internal inconsistencies (such as in the table of
intrinsics) before proceeding---@code{g77} will crash intrinsics) before proceeding---@command{g77} will crash
with a diagnostic if it detects an inconsistency. with a diagnostic if it detects an inconsistency.
@cindex -fno-silent option @cindex -fno-silent option
...@@ -444,13 +439,13 @@ with a diagnostic if it detects an inconsistency. ...@@ -444,13 +439,13 @@ with a diagnostic if it detects an inconsistency.
@item -fno-silent @item -fno-silent
Print (to @code{stderr}) the names of the program units as Print (to @code{stderr}) the names of the program units as
they are compiled, in a form similar to that used by popular they are compiled, in a form similar to that used by popular
UNIX @code{f77} implementations and @code{f2c}. UNIX @code{f77} implementations and @command{f2c}
@end table @end table
@xref{Overall Options,,Options Controlling the Kind of Output, @xref{Overall Options,,Options Controlling the Kind of Output,
gcc,Using and Porting GNU CC}, for information gcc,Using and Porting GNU CC}, for information
on more options that control the overall operation of the @code{gcc} command on more options that control the overall operation of the @command{gcc} command
(and, by extension, the @code{g77} command). (and, by extension, the @command{g77} command).
@node Shorthand Options @node Shorthand Options
@section Shorthand Options @section Shorthand Options
...@@ -462,7 +457,7 @@ on more options that control the overall operation of the @code{gcc} command ...@@ -462,7 +457,7 @@ on more options that control the overall operation of the @code{gcc} command
The following options serve as ``shorthand'' The following options serve as ``shorthand''
for other options accepted by the compiler: for other options accepted by the compiler:
@table @code @table @gcctabopt
@cindex -fugly option @cindex -fugly option
@cindex options, -fugly @cindex options, -fugly
@item -fugly @item -fugly
...@@ -510,11 +505,11 @@ Same as: ...@@ -510,11 +505,11 @@ Same as:
Specify that the program is written in idiomatic FORTRAN 66. Specify that the program is written in idiomatic FORTRAN 66.
Same as @samp{-fonetrip -fugly-assumed}. Same as @samp{-fonetrip -fugly-assumed}.
The @samp{-fno-f66} option is the inverse of @samp{-ff66}. The @option{-fno-f66} option is the inverse of @option{-ff66}.
As such, it is the same as @samp{-fno-onetrip -fno-ugly-assumed}. As such, it is the same as @samp{-fno-onetrip -fno-ugly-assumed}.
The meaning of this option is likely to be refined as future The meaning of this option is likely to be refined as future
versions of @code{g77} provide more compatibility with other versions of @command{g77} provide more compatibility with other
existing and obsolete Fortran implementations. existing and obsolete Fortran implementations.
@cindex -ff77 option @cindex -ff77 option
...@@ -526,25 +521,25 @@ existing and obsolete Fortran implementations. ...@@ -526,25 +521,25 @@ existing and obsolete Fortran implementations.
@cindex f77 compatibility @cindex f77 compatibility
@cindex compatibility, f77 @cindex compatibility, f77
Specify that the program is written in idiomatic UNIX FORTRAN 77 Specify that the program is written in idiomatic UNIX FORTRAN 77
and/or the dialect accepted by the @code{f2c} product. and/or the dialect accepted by the @command{f2c} product.
Same as @samp{-fbackslash -fno-typeless-boz}. Same as @samp{-fbackslash -fno-typeless-boz}.
The meaning of this option is likely to be refined as future The meaning of this option is likely to be refined as future
versions of @code{g77} provide more compatibility with other versions of @command{g77} provide more compatibility with other
existing and obsolete Fortran implementations. existing and obsolete Fortran implementations.
@cindex -fno-f77 option @cindex -fno-f77 option
@cindex options, -fno-f77 @cindex options, -fno-f77
@item -fno-f77 @item -fno-f77
@cindex UNIX f77 @cindex UNIX f77
The @samp{-fno-f77} option is @emph{not} the inverse The @option{-fno-f77} option is @emph{not} the inverse
of @samp{-ff77}. of @option{-ff77}.
It specifies that the program is not written in idiomatic UNIX It specifies that the program is not written in idiomatic UNIX
FORTRAN 77 or @code{f2c}, but in a more widely portable dialect. FORTRAN 77 or @command{f2c} but in a more widely portable dialect.
@samp{-fno-f77} is the same as @samp{-fno-backslash}. @option{-fno-f77} is the same as @option{-fno-backslash}.
The meaning of this option is likely to be refined as future The meaning of this option is likely to be refined as future
versions of @code{g77} provide more compatibility with other versions of @command{g77} provide more compatibility with other
existing and obsolete Fortran implementations. existing and obsolete Fortran implementations.
@end table @end table
...@@ -557,7 +552,7 @@ existing and obsolete Fortran implementations. ...@@ -557,7 +552,7 @@ existing and obsolete Fortran implementations.
The following options control the dialect of Fortran The following options control the dialect of Fortran
that the compiler accepts: that the compiler accepts:
@table @code @table @gcctabopt
@cindex -ffree-form option @cindex -ffree-form option
@cindex options, -ffree-form @cindex options, -ffree-form
@cindex -fno-fixed-form option @cindex -fno-fixed-form option
...@@ -581,7 +576,7 @@ This option controls whether certain ...@@ -581,7 +576,7 @@ This option controls whether certain
Fortran 90 constructs are recognized. Fortran 90 constructs are recognized.
(Other Fortran 90 constructs (Other Fortran 90 constructs
might or might not be recognized depending on other options such as might or might not be recognized depending on other options such as
@samp{-fvxt}, @samp{-ff90-intrinsics-enable}, and the @option{-fvxt}, @option{-ff90-intrinsics-enable}, and the
current level of support for Fortran 90.) current level of support for Fortran 90.)
@xref{Fortran 90}, for more information. @xref{Fortran 90}, for more information.
...@@ -596,8 +591,8 @@ meanings depending on whether the code is written in ...@@ -596,8 +591,8 @@ meanings depending on whether the code is written in
GNU Fortran (based on FORTRAN 77 and akin to Fortran 90) GNU Fortran (based on FORTRAN 77 and akin to Fortran 90)
or VXT Fortran (more like VAX FORTRAN). or VXT Fortran (more like VAX FORTRAN).
The default is @samp{-fno-vxt}. The default is @option{-fno-vxt}.
@samp{-fvxt} specifies that the VXT Fortran interpretations @option{-fvxt} specifies that the VXT Fortran interpretations
for those constructs are to be chosen. for those constructs are to be chosen.
@xref{VXT Fortran}, for more information. @xref{VXT Fortran}, for more information.
...@@ -619,22 +614,22 @@ Allow @samp{$} as a valid character in a symbol name. ...@@ -619,22 +614,22 @@ Allow @samp{$} as a valid character in a symbol name.
Specify that @samp{\} is not to be specially interpreted in character Specify that @samp{\} is not to be specially interpreted in character
and Hollerith constants a la C and many UNIX Fortran compilers. and Hollerith constants a la C and many UNIX Fortran compilers.
For example, with @samp{-fbackslash} in effect, @samp{A\nB} specifies For example, with @option{-fbackslash} in effect, @samp{A\nB} specifies
three characters, with the second one being newline. three characters, with the second one being newline.
With @samp{-fno-backslash}, it specifies four characters, With @option{-fno-backslash}, it specifies four characters,
@samp{A}, @samp{\}, @samp{n}, and @samp{B}. @samp{A}, @samp{\}, @samp{n}, and @samp{B}.
Note that @code{g77} implements a fairly general form of backslash Note that @command{g77} implements a fairly general form of backslash
processing that is incompatible with the narrower forms supported processing that is incompatible with the narrower forms supported
by some other compilers. by some other compilers.
For example, @samp{'A\003B'} is a three-character string in @code{g77}, For example, @samp{'A\003B'} is a three-character string in @command{g77}
whereas other compilers that support backslash might not support whereas other compilers that support backslash might not support
the three-octal-digit form, and thus treat that string as longer the three-octal-digit form, and thus treat that string as longer
than three characters. than three characters.
@xref{Backslash in Constants}, for @xref{Backslash in Constants}, for
information on why @samp{-fbackslash} is the default information on why @option{-fbackslash} is the default
instead of @samp{-fno-backslash}. instead of @option{-fno-backslash}.
@cindex -fno-ugly-args option @cindex -fno-ugly-args option
@cindex options, -fno-ugly-args @cindex options, -fno-ugly-args
...@@ -678,10 +673,10 @@ as specification of a single null argument. ...@@ -678,10 +673,10 @@ as specification of a single null argument.
For example, @samp{CALL FOO(,)} is treated as For example, @samp{CALL FOO(,)} is treated as
@samp{CALL FOO(%VAL(0), %VAL(0))}. @samp{CALL FOO(%VAL(0), %VAL(0))}.
That is, @emph{two} null arguments are specified That is, @emph{two} null arguments are specified
by the procedure call when @samp{-fugly-comma} is in force. by the procedure call when @option{-fugly-comma} is in force.
And @samp{F = FUNC()} is treated as @samp{F = FUNC(%VAL(0))}. And @samp{F = FUNC()} is treated as @samp{F = FUNC(%VAL(0))}.
The default behavior, @samp{-fno-ugly-comma}, is to ignore The default behavior, @option{-fno-ugly-comma}, is to ignore
a single trailing comma in an argument list. a single trailing comma in an argument list.
So, by default, @samp{CALL FOO(X,)} is treated So, by default, @samp{CALL FOO(X,)} is treated
exactly the same as @samp{CALL FOO(X)}. exactly the same as @samp{CALL FOO(X)}.
...@@ -697,7 +692,7 @@ type other than @code{COMPLEX(KIND=1)}---usually ...@@ -697,7 +692,7 @@ type other than @code{COMPLEX(KIND=1)}---usually
this is used to permit @code{COMPLEX(KIND=2)} this is used to permit @code{COMPLEX(KIND=2)}
(@code{DOUBLE COMPLEX}) operands. (@code{DOUBLE COMPLEX}) operands.
The @samp{-ff90} option controls the interpretation The @option{-ff90} option controls the interpretation
of this construct. of this construct.
@xref{Ugly Complex Part Extraction}, for more information. @xref{Ugly Complex Part Extraction}, for more information.
...@@ -711,7 +706,7 @@ use of character constants to ...@@ -711,7 +706,7 @@ use of character constants to
initialize numeric types and vice versa. initialize numeric types and vice versa.
For example, @samp{DATA I/'F'/, CHRVAR/65/, J/4HABCD/} is disallowed by For example, @samp{DATA I/'F'/, CHRVAR/65/, J/4HABCD/} is disallowed by
@samp{-fno-ugly-init}. @option{-fno-ugly-init}.
@xref{Ugly Conversion of Initializers}, for more information. @xref{Ugly Conversion of Initializers}, for more information.
...@@ -754,7 +749,7 @@ For example, some code written to the FORTRAN 66 standard ...@@ -754,7 +749,7 @@ For example, some code written to the FORTRAN 66 standard
expects this behavior from its @code{DO} loops, although that expects this behavior from its @code{DO} loops, although that
standard did not specify this behavior. standard did not specify this behavior.
The @samp{-fonetrip} option specifies that the source file(s) being The @option{-fonetrip} option specifies that the source file(s) being
compiled require one-trip loops. compiled require one-trip loops.
This option affects only those loops specified by the (iterative) @code{DO} This option affects only those loops specified by the (iterative) @code{DO}
...@@ -803,7 +798,7 @@ compatibility. ...@@ -803,7 +798,7 @@ compatibility.
@cindex options, -fintrin-case-any @cindex options, -fintrin-case-any
@item -fintrin-case-any @item -fintrin-case-any
Specify expected case for intrinsic names. Specify expected case for intrinsic names.
@samp{-fintrin-case-lower} is the default. @option{-fintrin-case-lower} is the default.
@cindex -fmatch-case-initcap option @cindex -fmatch-case-initcap option
@cindex options, -fmatch-case-initcap @cindex options, -fmatch-case-initcap
...@@ -818,7 +813,7 @@ Specify expected case for intrinsic names. ...@@ -818,7 +813,7 @@ Specify expected case for intrinsic names.
@cindex options, -fmatch-case-any @cindex options, -fmatch-case-any
@item -fmatch-case-any @item -fmatch-case-any
Specify expected case for keywords. Specify expected case for keywords.
@samp{-fmatch-case-lower} is the default. @option{-fmatch-case-lower} is the default.
@cindex -fsource-case-upper option @cindex -fsource-case-upper option
@cindex options, -fsource-case-upper @cindex options, -fsource-case-upper
...@@ -831,7 +826,7 @@ Specify expected case for keywords. ...@@ -831,7 +826,7 @@ Specify expected case for keywords.
@item -fsource-case-preserve @item -fsource-case-preserve
Specify whether source text other than character and Hollerith constants Specify whether source text other than character and Hollerith constants
is to be translated to uppercase, to lowercase, or preserved as is. is to be translated to uppercase, to lowercase, or preserved as is.
@samp{-fsource-case-lower} is the default. @option{-fsource-case-lower} is the default.
@cindex -fsymbol-case-initcap option @cindex -fsymbol-case-initcap option
@cindex options, -fsymbol-case-initcap @cindex options, -fsymbol-case-initcap
...@@ -846,7 +841,7 @@ is to be translated to uppercase, to lowercase, or preserved as is. ...@@ -846,7 +841,7 @@ is to be translated to uppercase, to lowercase, or preserved as is.
@cindex options, -fsymbol-case-any @cindex options, -fsymbol-case-any
@item -fsymbol-case-any @item -fsymbol-case-any
Specify valid cases for user-defined symbol names. Specify valid cases for user-defined symbol names.
@samp{-fsymbol-case-any} is the default. @option{-fsymbol-case-any} is the default.
@cindex -fcase-strict-upper option @cindex -fcase-strict-upper option
@cindex options, -fcase-strict-upper @cindex options, -fcase-strict-upper
...@@ -909,7 +904,7 @@ variables named @samp{i} and @samp{I} to a procedure named @samp{Foo}.) ...@@ -909,7 +904,7 @@ variables named @samp{i} and @samp{I} to a procedure named @samp{Foo}.)
@cindex @code{badu77} intrinsics @cindex @code{badu77} intrinsics
@cindex intrinsics, @code{badu77} @cindex intrinsics, @code{badu77}
Specify status of UNIX intrinsics having inappropriate forms. Specify status of UNIX intrinsics having inappropriate forms.
@samp{-fbadu77-intrinsics-enable} is the default. @option{-fbadu77-intrinsics-enable} is the default.
@xref{Intrinsic Groups}. @xref{Intrinsic Groups}.
@cindex -ff2c-intrinsics-delete option @cindex -ff2c-intrinsics-delete option
...@@ -924,10 +919,10 @@ Specify status of UNIX intrinsics having inappropriate forms. ...@@ -924,10 +919,10 @@ Specify status of UNIX intrinsics having inappropriate forms.
@cindex -ff2c-intrinsics-enable option @cindex -ff2c-intrinsics-enable option
@cindex options, -ff2c-intrinsics-enable @cindex options, -ff2c-intrinsics-enable
@item -ff2c-intrinsics-enable @item -ff2c-intrinsics-enable
@cindex @code{f2c} intrinsics @cindex @command{f2c} intrinsics
@cindex intrinsics, @code{f2c} @cindex intrinsics, @command{f2c}
Specify status of f2c-specific intrinsics. Specify status of f2c-specific intrinsics.
@samp{-ff2c-intrinsics-enable} is the default. @option{-ff2c-intrinsics-enable} is the default.
@xref{Intrinsic Groups}. @xref{Intrinsic Groups}.
@cindex -ff90-intrinsics-delete option @cindex -ff90-intrinsics-delete option
...@@ -945,7 +940,7 @@ Specify status of f2c-specific intrinsics. ...@@ -945,7 +940,7 @@ Specify status of f2c-specific intrinsics.
@cindex Fortran 90, intrinsics @cindex Fortran 90, intrinsics
@cindex intrinsics, Fortran 90 @cindex intrinsics, Fortran 90
Specify status of F90-specific intrinsics. Specify status of F90-specific intrinsics.
@samp{-ff90-intrinsics-enable} is the default. @option{-ff90-intrinsics-enable} is the default.
@xref{Intrinsic Groups}. @xref{Intrinsic Groups}.
@cindex -fgnu-intrinsics-delete option @cindex -fgnu-intrinsics-delete option
...@@ -964,7 +959,7 @@ Specify status of F90-specific intrinsics. ...@@ -964,7 +959,7 @@ Specify status of F90-specific intrinsics.
@cindex @code{COMPLEX} intrinsics @cindex @code{COMPLEX} intrinsics
@cindex intrinsics, @code{COMPLEX} @cindex intrinsics, @code{COMPLEX}
Specify status of Digital's COMPLEX-related intrinsics. Specify status of Digital's COMPLEX-related intrinsics.
@samp{-fgnu-intrinsics-enable} is the default. @option{-fgnu-intrinsics-enable} is the default.
@xref{Intrinsic Groups}. @xref{Intrinsic Groups}.
@cindex -fmil-intrinsics-delete option @cindex -fmil-intrinsics-delete option
...@@ -982,7 +977,7 @@ Specify status of Digital's COMPLEX-related intrinsics. ...@@ -982,7 +977,7 @@ Specify status of Digital's COMPLEX-related intrinsics.
@cindex MIL-STD 1753 @cindex MIL-STD 1753
@cindex intrinsics, MIL-STD 1753 @cindex intrinsics, MIL-STD 1753
Specify status of MIL-STD-1753-specific intrinsics. Specify status of MIL-STD-1753-specific intrinsics.
@samp{-fmil-intrinsics-enable} is the default. @option{-fmil-intrinsics-enable} is the default.
@xref{Intrinsic Groups}. @xref{Intrinsic Groups}.
@cindex -funix-intrinsics-delete option @cindex -funix-intrinsics-delete option
...@@ -1000,7 +995,7 @@ Specify status of MIL-STD-1753-specific intrinsics. ...@@ -1000,7 +995,7 @@ Specify status of MIL-STD-1753-specific intrinsics.
@cindex UNIX intrinsics @cindex UNIX intrinsics
@cindex intrinsics, UNIX @cindex intrinsics, UNIX
Specify status of UNIX intrinsics. Specify status of UNIX intrinsics.
@samp{-funix-intrinsics-enable} is the default. @option{-funix-intrinsics-enable} is the default.
@xref{Intrinsic Groups}. @xref{Intrinsic Groups}.
@cindex -fvxt-intrinsics-delete option @cindex -fvxt-intrinsics-delete option
...@@ -1018,7 +1013,7 @@ Specify status of UNIX intrinsics. ...@@ -1018,7 +1013,7 @@ Specify status of UNIX intrinsics.
@cindex VXT intrinsics @cindex VXT intrinsics
@cindex intrinsics, VXT @cindex intrinsics, VXT
Specify status of VXT intrinsics. Specify status of VXT intrinsics.
@samp{-fvxt-intrinsics-enable} is the default. @option{-fvxt-intrinsics-enable} is the default.
@xref{Intrinsic Groups}. @xref{Intrinsic Groups}.
@cindex -ffixed-line-length-@var{n} option @cindex -ffixed-line-length-@var{n} option
...@@ -1041,8 +1036,8 @@ to ``extended-source'' options in some popular compilers). ...@@ -1041,8 +1036,8 @@ to ``extended-source'' options in some popular compilers).
@var{n} may be @samp{none}, meaning that the entire line is meaningful @var{n} may be @samp{none}, meaning that the entire line is meaningful
and that continued character constants never have implicit spaces appended and that continued character constants never have implicit spaces appended
to them to fill out the line. to them to fill out the line.
@samp{-ffixed-line-length-0} means the same thing as @option{-ffixed-line-length-0} means the same thing as
@samp{-ffixed-line-length-none}. @option{-ffixed-line-length-none}.
@xref{Source Form}, for more information. @xref{Source Form}, for more information.
@end table @end table
...@@ -1058,17 +1053,17 @@ Warnings are diagnostic messages that report constructions which ...@@ -1058,17 +1053,17 @@ Warnings are diagnostic messages that report constructions which
are not inherently erroneous but which are risky or suggest there are not inherently erroneous but which are risky or suggest there
might have been an error. might have been an error.
You can request many specific warnings with options beginning @samp{-W}, You can request many specific warnings with options beginning @option{-W},
for example @samp{-Wimplicit} to request warnings on implicit for example @option{-Wimplicit} to request warnings on implicit
declarations. Each of these specific warning options also has a declarations. Each of these specific warning options also has a
negative form beginning @samp{-Wno-} to turn off warnings; negative form beginning @option{-Wno-} to turn off warnings;
for example, @samp{-Wno-implicit}. This manual lists only one of the for example, @option{-Wno-implicit}. This manual lists only one of the
two forms, whichever is not the default. two forms, whichever is not the default.
These options control the amount and kinds of warnings produced by GNU These options control the amount and kinds of warnings produced by GNU
Fortran: Fortran:
@table @code @table @gcctabopt
@cindex syntax checking @cindex syntax checking
@cindex -fsyntax-only option @cindex -fsyntax-only option
@cindex options, -fsyntax-only @cindex options, -fsyntax-only
...@@ -1079,7 +1074,7 @@ Check the code for syntax errors, but don't do anything beyond that. ...@@ -1079,7 +1074,7 @@ Check the code for syntax errors, but don't do anything beyond that.
@cindex options, -pedantic @cindex options, -pedantic
@item -pedantic @item -pedantic
Issue warnings for uses of extensions to ANSI FORTRAN 77. Issue warnings for uses of extensions to ANSI FORTRAN 77.
@samp{-pedantic} also applies to C-language constructs where they @option{-pedantic} also applies to C-language constructs where they
occur in GNU Fortran source files, such as use of @samp{\e} in a occur in GNU Fortran source files, such as use of @samp{\e} in a
character constant within a directive like @samp{#include}. character constant within a directive like @samp{#include}.
...@@ -1089,22 +1084,22 @@ However, without this option, certain GNU extensions and traditional ...@@ -1089,22 +1084,22 @@ However, without this option, certain GNU extensions and traditional
Fortran features are supported as well. Fortran features are supported as well.
With this option, many of them are rejected. With this option, many of them are rejected.
Some users try to use @samp{-pedantic} to check programs for strict ANSI Some users try to use @option{-pedantic} to check programs for strict ANSI
conformance. conformance.
They soon find that it does not do quite what they want---it finds some They soon find that it does not do quite what they want---it finds some
non-ANSI practices, but not all. non-ANSI practices, but not all.
However, improvements to @code{g77} in this area are welcome. However, improvements to @command{g77} in this area are welcome.
@cindex -pedantic-errors option @cindex -pedantic-errors option
@cindex options, -pedantic-errors @cindex options, -pedantic-errors
@item -pedantic-errors @item -pedantic-errors
Like @samp{-pedantic}, except that errors are produced rather than Like @option{-pedantic}, except that errors are produced rather than
warnings. warnings.
@cindex -fpedantic option @cindex -fpedantic option
@cindex options, -fpedantic @cindex options, -fpedantic
@item -fpedantic @item -fpedantic
Like @samp{-pedantic}, but applies only to Fortran constructs. Like @option{-pedantic}, but applies only to Fortran constructs.
@cindex -w option @cindex -w option
@cindex options, -w @cindex options, -w
...@@ -1140,7 +1135,7 @@ declared. ...@@ -1140,7 +1135,7 @@ declared.
Has an effect similar to using the @code{IMPLICIT NONE} statement Has an effect similar to using the @code{IMPLICIT NONE} statement
in every program unit. in every program unit.
(Some Fortran compilers provide this feature by an option (Some Fortran compilers provide this feature by an option
named @samp{-u} or @samp{/WARNINGS=DECLARATIONS}.) named @option{-u} or @samp{/WARNINGS=DECLARATIONS}.)
@cindex -Wunused option @cindex -Wunused option
@cindex options, -Wunused @cindex options, -Wunused
...@@ -1158,7 +1153,7 @@ Warn whenever an automatic variable is used without first being initialized. ...@@ -1158,7 +1153,7 @@ Warn whenever an automatic variable is used without first being initialized.
These warnings are possible only in optimizing compilation, These warnings are possible only in optimizing compilation,
because they require data-flow information that is computed only because they require data-flow information that is computed only
when optimizing. If you don't specify @samp{-O}, you simply won't when optimizing. If you don't specify @option{-O}, you simply won't
get these warnings. get these warnings.
These warnings occur only for variables that are candidates for These warnings occur only for variables that are candidates for
...@@ -1209,25 +1204,25 @@ This has no bug because @code{VALUE} is used only if it is set. ...@@ -1209,25 +1204,25 @@ This has no bug because @code{VALUE} is used only if it is set.
@item -Wall @item -Wall
@cindex all warnings @cindex all warnings
@cindex warnings, all @cindex warnings, all
The @samp{-Wunused} and @samp{-Wuninitialized} options combined. The @option{-Wunused} and @option{-Wuninitialized} options combined.
These are all the These are all the
options which pertain to usage that we recommend avoiding and that we options which pertain to usage that we recommend avoiding and that we
believe is easy to avoid. believe is easy to avoid.
(As more warnings are added to @code{g77}, some might (As more warnings are added to @command{g77} some might
be added to the list enabled by @samp{-Wall}.) be added to the list enabled by @option{-Wall}.)
@end table @end table
The remaining @samp{-W@dots{}} options are not implied by @samp{-Wall} The remaining @option{-W@dots{}} options are not implied by @option{-Wall}
because they warn about constructions that we consider reasonable to because they warn about constructions that we consider reasonable to
use, on occasion, in clean programs. use, on occasion, in clean programs.
@table @code @table @gcctabopt
@c @item -W @c @item -W
@c Print extra warning messages for these events: @c Print extra warning messages for these events:
@c @c
@c @itemize @bullet @c @itemize @bullet
@c @item @c @item
@c If @samp{-Wall} or @samp{-Wunused} is also specified, warn about unused @c If @option{-Wall} or @option{-Wunused} is also specified, warn about unused
@c arguments. @c arguments.
@c @c
@c @end itemize @c @end itemize
...@@ -1249,19 +1244,19 @@ as @samp{X*-Y}. ...@@ -1249,19 +1244,19 @@ as @samp{X*-Y}.
Such a construct is nonstandard, and can produce Such a construct is nonstandard, and can produce
unexpected results in more complicated situations such unexpected results in more complicated situations such
as @samp{X**-Y*Z}. as @samp{X**-Y*Z}.
@code{g77}, along with many other compilers, interprets @command{g77} along with many other compilers, interprets
this example differently than many programmers, and a few this example differently than many programmers, and a few
other compilers. other compilers.
Specifically, @code{g77} interprets @samp{X**-Y*Z} as Specifically, @command{g77} interprets @samp{X**-Y*Z} as
@samp{(X**(-Y))*Z}, while others might think it should @samp{(X**(-Y))*Z}, while others might think it should
be interpreted as @samp{X**(-(Y*Z))}. be interpreted as @samp{X**(-(Y*Z))}.
A revealing example is the constant expression @samp{2**-2*1.}, A revealing example is the constant expression @samp{2**-2*1.},
which @code{g77} evaluates to .25, while others might evaluate which @command{g77} evaluates to .25, while others might evaluate
it to 0., the difference resulting from the way precedence affects it to 0., the difference resulting from the way precedence affects
type promotion. type promotion.
(The @samp{-fpedantic} option also warns about expressions (The @option{-fpedantic} option also warns about expressions
having two arithmetic operators in a row.) having two arithmetic operators in a row.)
@item @item
...@@ -1298,7 +1293,7 @@ code. ...@@ -1298,7 +1293,7 @@ code.
of integral type---that is, using @code{REAL} of integral type---that is, using @code{REAL}
variables as loop control variables. variables as loop control variables.
Although such loops can be written to work in the Although such loops can be written to work in the
``obvious'' way, the way @code{g77} is required by the ``obvious'' way, the way @command{g77} is required by the
Fortran standard to interpret such code is likely to Fortran standard to interpret such code is likely to
be quite different from the way many programmers expect. be quite different from the way many programmers expect.
(This is true of all @code{DO} loops, but the differences (This is true of all @code{DO} loops, but the differences
...@@ -1318,8 +1313,8 @@ Make all warnings into errors. ...@@ -1318,8 +1313,8 @@ Make all warnings into errors.
@cindex extra warnings @cindex extra warnings
@cindex warnings, extra @cindex warnings, extra
Turns on ``extra warnings'' and, if optimization is specified Turns on ``extra warnings'' and, if optimization is specified
via @samp{-O}, the @samp{-Wuninitialized} option. via @option{-O}, the @option{-Wuninitialized} option.
(This might change in future versions of @code{g77}.) (This might change in future versions of @command{g77}
``Extra warnings'' are issued for: ``Extra warnings'' are issued for:
...@@ -1331,7 +1326,7 @@ via @samp{-O}, the @samp{-Wuninitialized} option. ...@@ -1331,7 +1326,7 @@ via @samp{-O}, the @samp{-Wuninitialized} option.
@cindex arguments, unused @cindex arguments, unused
@cindex unused dummies @cindex unused dummies
@cindex dummies, unused @cindex dummies, unused
Unused parameters to a procedure (when @samp{-Wunused} also is Unused parameters to a procedure (when @option{-Wunused} also is
specified). specified).
@item @item
...@@ -1343,11 +1338,11 @@ for certain configurations). ...@@ -1343,11 +1338,11 @@ for certain configurations).
@xref{Warning Options,,Options to Request or Suppress Warnings, @xref{Warning Options,,Options to Request or Suppress Warnings,
gcc,Using and Porting GNU CC}, for information on more options offered gcc,Using and Porting GNU CC}, for information on more options offered
by the GBE shared by @code{g77}, @code{gcc}, and other GNU compilers. by the GBE shared by @command{g77} @command{gcc} and other GNU compilers.
Some of these have no effect when compiling programs written in Fortran: Some of these have no effect when compiling programs written in Fortran:
@table @code @table @gcctabopt
@cindex -Wcomment option @cindex -Wcomment option
@cindex options, -Wcomment @cindex options, -Wcomment
@item -Wcomment @item -Wcomment
...@@ -1393,9 +1388,9 @@ GNU Fortran programs, but are not yet supported. ...@@ -1393,9 +1388,9 @@ GNU Fortran programs, but are not yet supported.
@cindex debugging information options @cindex debugging information options
GNU Fortran has various special options that are used for debugging GNU Fortran has various special options that are used for debugging
either your program or @code{g77}. either your program or @command{g77}
@table @code @table @gcctabopt
@cindex -g option @cindex -g option
@cindex options, -g @cindex options, -g
@item -g @item -g
...@@ -1413,22 +1408,22 @@ gcc,Using and Porting GNU CC}, for more information on debugging options. ...@@ -1413,22 +1408,22 @@ gcc,Using and Porting GNU CC}, for more information on debugging options.
@cindex options, optimization @cindex options, optimization
Most Fortran users will want to use no optimization when Most Fortran users will want to use no optimization when
developing and testing programs, and use @samp{-O} or @samp{-O2} when developing and testing programs, and use @option{-O} or @option{-O2} when
compiling programs for late-cycle testing and for production use. compiling programs for late-cycle testing and for production use.
However, note that certain diagnostics---such as for uninitialized However, note that certain diagnostics---such as for uninitialized
variables---depend on the flow analysis done by @samp{-O}, i.e.@: you variables---depend on the flow analysis done by @option{-O}, i.e.@: you
must use @samp{-O} or @samp{-O2} to get such diagnostics. must use @option{-O} or @option{-O2} to get such diagnostics.
The following flags have particular applicability when The following flags have particular applicability when
compiling Fortran programs: compiling Fortran programs:
@table @code @table @gcctabopt
@cindex -malign-double option @cindex -malign-double option
@cindex options, -malign-double @cindex options, -malign-double
@item -malign-double @item -malign-double
(Intel x86 architecture only.) (Intel x86 architecture only.)
Noticeably improves performance of @code{g77} programs making Noticeably improves performance of @command{g77} programs making
heavy use of @code{REAL(KIND=2)} (@code{DOUBLE PRECISION}) data heavy use of @code{REAL(KIND=2)} (@code{DOUBLE PRECISION}) data
on some systems. on some systems.
In particular, systems using Pentium, Pentium Pro, 586, and In particular, systems using Pentium, Pentium Pro, 586, and
...@@ -1442,14 +1437,14 @@ This option can, at least, make benchmark results more consistent ...@@ -1442,14 +1437,14 @@ This option can, at least, make benchmark results more consistent
across various system configurations, versions of the program, across various system configurations, versions of the program,
and data sets. and data sets.
@emph{Note:} The warning in the @code{gcc} documentation about @emph{Note:} The warning in the @command{gcc} documentation about
this option does not apply, generally speaking, to Fortran this option does not apply, generally speaking, to Fortran
code compiled by @code{g77}. code compiled by @command{g77}
@xref{Aligned Data}, for more information on alignment issues. @xref{Aligned Data}, for more information on alignment issues.
@emph{Also also note:} The negative form of @samp{-malign-double} @emph{Also also note:} The negative form of @option{-malign-double}
is @samp{-mno-align-double}, not @samp{-benign-double}. is @option{-mno-align-double}, not @option{-benign-double}.
@cindex -ffloat-store option @cindex -ffloat-store option
@cindex options, -ffloat-store @cindex options, -ffloat-store
...@@ -1462,7 +1457,7 @@ some machines, but might slow down a program that doesn't. ...@@ -1462,7 +1457,7 @@ some machines, but might slow down a program that doesn't.
This option is effective when the floating-point unit is set to work in This option is effective when the floating-point unit is set to work in
IEEE 854 `extended precision'---as it typically is on x86 and m68k GNU IEEE 854 `extended precision'---as it typically is on x86 and m68k GNU
systems---rather than IEEE 754 double precision. @samp{-ffloat-store} systems---rather than IEEE 754 double precision. @option{-ffloat-store}
tries to remove the extra precision by spilling data from floating-point tries to remove the extra precision by spilling data from floating-point
registers into memory and this typically involves a big performance registers into memory and this typically involves a big performance
hit. However, it doesn't affect intermediate results, so that it is hit. However, it doesn't affect intermediate results, so that it is
...@@ -1494,7 +1489,8 @@ Might improve optimization of loops. ...@@ -1494,7 +1489,8 @@ Might improve optimization of loops.
@item -fno-inline @item -fno-inline
@cindex in-line code @cindex in-line code
@cindex compilation, in-line @cindex compilation, in-line
@c DL: Only relevant for -O3? @c DL: Only relevant for -O3? TM: No, statement functions are
@c inlined even at -O1.
Don't compile statement functions inline. Don't compile statement functions inline.
Might reduce the size of a program unit---which might be at Might reduce the size of a program unit---which might be at
expense of some speed (though it should compile faster). expense of some speed (though it should compile faster).
...@@ -1507,8 +1503,8 @@ Note that if you are not optimizing, no functions can be expanded inline. ...@@ -1507,8 +1503,8 @@ Note that if you are not optimizing, no functions can be expanded inline.
@cindex conformance, IEEE 754 @cindex conformance, IEEE 754
Might allow some programs designed to not be too dependent Might allow some programs designed to not be too dependent
on IEEE behavior for floating-point to run faster, or die trying. on IEEE behavior for floating-point to run faster, or die trying.
Sets @samp{-funsafe-math-optimizations}, and Sets @option{-funsafe-math-optimizations}, and
@samp{-fno-trapping-math}. @option{-fno-trapping-math}.
@cindex -funsafe-math-optimizations option @cindex -funsafe-math-optimizations option
@cindex options, -funsafe-math-optimizations @cindex options, -funsafe-math-optimizations
...@@ -1597,7 +1593,7 @@ currently recognized as such. This option unrolls only iterative ...@@ -1597,7 +1593,7 @@ currently recognized as such. This option unrolls only iterative
@c DL: Check my understanding of -funroll-all-loops v. -funroll-loops is correct. @c DL: Check my understanding of -funroll-all-loops v. -funroll-loops is correct.
Probably improves performance on code using @code{DO WHILE} loops by Probably improves performance on code using @code{DO WHILE} loops by
unrolling them in addition to iterative @code{DO} loops. In the absence unrolling them in addition to iterative @code{DO} loops. In the absence
of @code{DO WHILE}, this option is equivalent to @samp{-funroll-loops} of @code{DO WHILE}, this option is equivalent to @option{-funroll-loops}
but possibly slower. but possibly slower.
@item -fno-move-all-movables @item -fno-move-all-movables
...@@ -1611,7 +1607,7 @@ but possibly slower. ...@@ -1611,7 +1607,7 @@ but possibly slower.
@cindex options, -fno-rerun-loop-opt @cindex options, -fno-rerun-loop-opt
@emph{Version info:} @emph{Version info:}
These options are not supported by These options are not supported by
versions of @code{g77} based on @code{gcc} version 2.8. versions of @command{g77} based on @command{gcc} version 2.8.
Each of these might improve performance on some code. Each of these might improve performance on some code.
...@@ -1628,7 +1624,7 @@ the performance of your production code. ...@@ -1628,7 +1624,7 @@ the performance of your production code.
We're particularly interested in code that runs faster We're particularly interested in code that runs faster
when these options are @emph{disabled}, and in when these options are @emph{disabled}, and in
non-Fortran code that benefits when they are non-Fortran code that benefits when they are
@emph{enabled} via the above @code{gcc} command-line options. @emph{enabled} via the above @command{gcc} command-line options.
@end table @end table
@xref{Optimize Options,,Options That Control Optimization, @xref{Optimize Options,,Options That Control Optimization,
...@@ -1650,12 +1646,12 @@ gcc,Using and Porting GNU CC}, for information on C preprocessor options. ...@@ -1650,12 +1646,12 @@ gcc,Using and Porting GNU CC}, for information on C preprocessor options.
@cindex INCLUDE directive @cindex INCLUDE directive
@cindex directive, INCLUDE @cindex directive, INCLUDE
Some of these options also affect how @code{g77} processes the Some of these options also affect how @command{g77} processes the
@code{INCLUDE} directive. @code{INCLUDE} directive.
Since this directive is processed even when preprocessing Since this directive is processed even when preprocessing
is not requested, it is not described in this section. is not requested, it is not described in this section.
@xref{Directory Options,,Options for Directory Search}, for @xref{Directory Options,,Options for Directory Search}, for
information on how @code{g77} processes the @code{INCLUDE} directive. information on how @command{g77} processes the @code{INCLUDE} directive.
However, the @code{INCLUDE} directive does not apply However, the @code{INCLUDE} directive does not apply
preprocessing to the contents of the included file itself. preprocessing to the contents of the included file itself.
...@@ -1681,13 +1677,13 @@ when the preprocessor is used. ...@@ -1681,13 +1677,13 @@ when the preprocessor is used.
@cindex INCLUDE directive @cindex INCLUDE directive
@cindex directive, INCLUDE @cindex directive, INCLUDE
Some of these options also affect how @code{g77} searches Some of these options also affect how @command{g77} searches
for files specified via the @code{INCLUDE} directive, for files specified via the @code{INCLUDE} directive,
although files included by that directive are not, although files included by that directive are not,
themselves, preprocessed. themselves, preprocessed.
These options are: These options are:
@table @code @table @gcctabopt
@cindex -I- option @cindex -I- option
@cindex options, -I- @cindex options, -I-
@item -I- @item -I-
...@@ -1702,19 +1698,19 @@ These affect interpretation of the @code{INCLUDE} directive ...@@ -1702,19 +1698,19 @@ These affect interpretation of the @code{INCLUDE} directive
(as well as of the @code{#include} directive of the @code{cpp} (as well as of the @code{#include} directive of the @code{cpp}
preprocessor). preprocessor).
Note that @samp{-I@var{dir}} must be specified @emph{without} any Note that @option{-I@var{dir}} must be specified @emph{without} any
spaces between @samp{-I} and the directory name---that is, spaces between @option{-I} and the directory name---that is,
@samp{-Ifoo/bar} is valid, but @samp{-I foo/bar} @option{-Ifoo/bar} is valid, but @option{-I foo/bar}
is rejected by the @code{g77} compiler (though the preprocessor supports is rejected by the @command{g77} compiler (though the preprocessor supports
the latter form). the latter form).
@c this is due to toplev.c's inflexible option processing @c this is due to toplev.c's inflexible option processing
Also note that the general behavior of @samp{-I} and Also note that the general behavior of @option{-I} and
@code{INCLUDE} is pretty much the same as of @samp{-I} with @code{INCLUDE} is pretty much the same as of @option{-I} with
@code{#include} in the @code{cpp} preprocessor, with regard to @code{#include} in the @code{cpp} preprocessor, with regard to
looking for @file{header.gcc} files and other such things. looking for @file{header.gcc} files and other such things.
@xref{Directory Options,,Options for Directory Search, @xref{Directory Options,,Options for Directory Search,
gcc,Using and Porting GNU CC}, for information on the @samp{-I} option. gcc,Using and Porting GNU CC}, for information on the @option{-I} option.
@end table @end table
@node Code Gen Options @node Code Gen Options
...@@ -1727,12 +1723,12 @@ These machine-independent options control the interface conventions ...@@ -1727,12 +1723,12 @@ These machine-independent options control the interface conventions
used in code generation. used in code generation.
Most of them have both positive and negative forms; the negative form Most of them have both positive and negative forms; the negative form
of @samp{-ffoo} would be @samp{-fno-foo}. In the table below, only of @option{-ffoo} would be @option{-fno-foo}. In the table below, only
one of the forms is listed---the one which is not the default. You one of the forms is listed---the one which is not the default. You
can figure out the other form by either removing @samp{no-} or adding can figure out the other form by either removing @option{no-} or adding
it. it.
@table @code @table @gcctabopt
@cindex -fno-automatic option @cindex -fno-automatic option
@cindex options, -fno-automatic @cindex options, -fno-automatic
@item -fno-automatic @item -fno-automatic
...@@ -1742,7 +1738,7 @@ Treat each program unit as if the @code{SAVE} statement was specified ...@@ -1742,7 +1738,7 @@ Treat each program unit as if the @code{SAVE} statement was specified
for every local variable and array referenced in it. for every local variable and array referenced in it.
Does not affect common blocks. Does not affect common blocks.
(Some Fortran compilers provide this option under (Some Fortran compilers provide this option under
the name @samp{-static}.) the name @option{-static}.)
@cindex -finit-local-zero option @cindex -finit-local-zero option
@cindex options, -finit-local-zero @cindex options, -finit-local-zero
...@@ -1759,17 +1755,17 @@ to binary zeros. ...@@ -1759,17 +1755,17 @@ to binary zeros.
Since there is a run-time penalty for initialization of variables Since there is a run-time penalty for initialization of variables
that are not given the @code{SAVE} attribute, it might be a that are not given the @code{SAVE} attribute, it might be a
good idea to also use @samp{-fno-automatic} with @samp{-finit-local-zero}. good idea to also use @option{-fno-automatic} with @option{-finit-local-zero}.
@cindex -fno-f2c option @cindex -fno-f2c option
@cindex options, -fno-f2c @cindex options, -fno-f2c
@item -fno-f2c @item -fno-f2c
@cindex @code{f2c} compatibility @cindex @command{f2c} compatibility
@cindex compatibility, @code{f2c} @cindex compatibility, @command{f2c}
Do not generate code designed to be compatible with code generated Do not generate code designed to be compatible with code generated
by @code{f2c}; use the GNU calling conventions instead. by @command{f2c} use the GNU calling conventions instead.
The @code{f2c} calling conventions require functions that return The @command{f2c} calling conventions require functions that return
type @code{REAL(KIND=1)} to actually return the C type @code{double}, type @code{REAL(KIND=1)} to actually return the C type @code{double},
and functions that return type @code{COMPLEX} to return the and functions that return type @code{COMPLEX} to return the
values via an extra argument in the calling sequence that points values via an extra argument in the calling sequence that points
...@@ -1783,23 +1779,23 @@ equivalent). ...@@ -1783,23 +1779,23 @@ equivalent).
This does not affect the generation of code that interfaces with the This does not affect the generation of code that interfaces with the
@code{libg2c} library. @code{libg2c} library.
However, because the @code{libg2c} library uses @code{f2c} However, because the @code{libg2c} library uses @command{f2c}
calling conventions, @code{g77} rejects attempts to pass calling conventions, @command{g77} rejects attempts to pass
intrinsics implemented by routines in this library as actual intrinsics implemented by routines in this library as actual
arguments when @samp{-fno-f2c} is used, to avoid bugs when arguments when @option{-fno-f2c} is used, to avoid bugs when
they are actually called by code expecting the GNU calling they are actually called by code expecting the GNU calling
conventions to work. conventions to work.
For example, @samp{INTRINSIC ABS;CALL FOO(ABS)} is For example, @samp{INTRINSIC ABS;CALL FOO(ABS)} is
rejected when @samp{-fno-f2c} is in force. rejected when @option{-fno-f2c} is in force.
(Future versions of the @code{g77} run-time library might (Future versions of the @command{g77} run-time library might
offer routines that provide GNU-callable versions of the offer routines that provide GNU-callable versions of the
routines that implement the @code{f2c}-callable intrinsics routines that implement the @command{f2c} intrinsics
that may be passed as actual arguments, so that that may be passed as actual arguments, so that
valid programs need not be rejected when @samp{-fno-f2c} valid programs need not be rejected when @option{-fno-f2c}
is used.) is used.)
@strong{Caution:} If @samp{-fno-f2c} is used when compiling any @strong{Caution:} If @option{-fno-f2c} is used when compiling any
source file used in a program, it must be used when compiling source file used in a program, it must be used when compiling
@emph{all} Fortran source files used in that program. @emph{all} Fortran source files used in that program.
...@@ -1810,14 +1806,14 @@ source file used in a program, it must be used when compiling ...@@ -1810,14 +1806,14 @@ source file used in a program, it must be used when compiling
@item -ff2c-library @item -ff2c-library
Specify that use of @code{libg2c} (or the original @code{libf2c}) Specify that use of @code{libg2c} (or the original @code{libf2c})
is required. is required.
This is the default for the current version of @code{g77}. This is the default for the current version of @command{g77}
Currently it is not Currently it is not
valid to specify @samp{-fno-f2c-library}. valid to specify @option{-fno-f2c-library}.
This option is provided so users can specify it in shell This option is provided so users can specify it in shell
scripts that build programs and libraries that require the scripts that build programs and libraries that require the
@code{libf2c} library, even when being compiled by future @code{libf2c} library, even when being compiled by future
versions of @code{g77} that might otherwise default to versions of @command{g77} that might otherwise default to
generating code for an incompatible library. generating code for an incompatible library.
@cindex -fno-underscoring option @cindex -fno-underscoring option
...@@ -1830,24 +1826,24 @@ generating code for an incompatible library. ...@@ -1830,24 +1826,24 @@ generating code for an incompatible library.
Do not transform names of entities specified in the Fortran Do not transform names of entities specified in the Fortran
source file by appending underscores to them. source file by appending underscores to them.
With @samp{-funderscoring} in effect, @code{g77} appends two underscores With @option{-funderscoring} in effect, @command{g77} appends two underscores
to names with underscores and one underscore to external names with to names with underscores and one underscore to external names with
no underscores. (@code{g77} also appends two underscores to internal no underscores. (@command{g77} also appends two underscores to internal
names with underscores to avoid naming collisions with external names. names with underscores to avoid naming collisions with external names.
The @samp{-fno-second-underscore} option disables appending of the The @option{-fno-second-underscore} option disables appending of the
second underscore in all cases.) second underscore in all cases.)
This is done to ensure compatibility with code produced by many This is done to ensure compatibility with code produced by many
UNIX Fortran compilers, including @code{f2c}, which perform the UNIX Fortran compilers, including @command{f2c} which perform the
same transformations. same transformations.
Use of @samp{-fno-underscoring} is not recommended unless you are Use of @option{-fno-underscoring} is not recommended unless you are
experimenting with issues such as integration of (GNU) Fortran into experimenting with issues such as integration of (GNU) Fortran into
existing system environments (vis-a-vis existing libraries, tools, and existing system environments (vis-a-vis existing libraries, tools, and
so on). so on).
For example, with @samp{-funderscoring}, and assuming other defaults like For example, with @option{-funderscoring}, and assuming other defaults like
@samp{-fcase-lower} and that @samp{j()} and @samp{max_count()} are @option{-fcase-lower} and that @samp{j()} and @samp{max_count()} are
external functions while @samp{my_var} and @samp{lvar} are local variables, external functions while @samp{my_var} and @samp{lvar} are local variables,
a statement like a statement like
...@@ -1862,34 +1858,34 @@ is implemented as something akin to: ...@@ -1862,34 +1858,34 @@ is implemented as something akin to:
i = j_() + max_count__(&my_var__, &lvar); i = j_() + max_count__(&my_var__, &lvar);
@end smallexample @end smallexample
With @samp{-fno-underscoring}, the same statement is implemented as: With @option{-fno-underscoring}, the same statement is implemented as:
@smallexample @smallexample
i = j() + max_count(&my_var, &lvar); i = j() + max_count(&my_var, &lvar);
@end smallexample @end smallexample
Use of @samp{-fno-underscoring} allows direct specification of Use of @option{-fno-underscoring} allows direct specification of
user-defined names while debugging and when interfacing @code{g77}-compiled user-defined names while debugging and when interfacing @command{g77}
code with other languages. code with other languages.
Note that just because the names match does @emph{not} mean that the Note that just because the names match does @emph{not} mean that the
interface implemented by @code{g77} for an external name matches the interface implemented by @command{g77} for an external name matches the
interface implemented by some other language for that same name. interface implemented by some other language for that same name.
That is, getting code produced by @code{g77} to link to code produced That is, getting code produced by @command{g77} to link to code produced
by some other compiler using this or any other method can be only a by some other compiler using this or any other method can be only a
small part of the overall solution---getting the code generated by small part of the overall solution---getting the code generated by
both compilers to agree on issues other than naming can require both compilers to agree on issues other than naming can require
significant effort, and, unlike naming disagreements, linkers normally significant effort, and, unlike naming disagreements, linkers normally
cannot detect disagreements in these other areas. cannot detect disagreements in these other areas.
Also, note that with @samp{-fno-underscoring}, the lack of appended Also, note that with @option{-fno-underscoring}, the lack of appended
underscores introduces the very real possibility that a user-defined underscores introduces the very real possibility that a user-defined
external name will conflict with a name in a system library, which external name will conflict with a name in a system library, which
could make finding unresolved-reference bugs quite difficult in some could make finding unresolved-reference bugs quite difficult in some
cases---they might occur at program run time, and show up only as cases---they might occur at program run time, and show up only as
buggy behavior at run time. buggy behavior at run time.
In future versions of @code{g77}, we hope to improve naming and linking In future versions of @command{g77} we hope to improve naming and linking
issues so that debugging always involves using the names as they appear issues so that debugging always involves using the names as they appear
in the source, even if the names as seen by the linker are mangled to in the source, even if the names as seen by the linker are mangled to
prevent accidental linking between procedures with incompatible prevent accidental linking between procedures with incompatible
...@@ -1905,7 +1901,7 @@ interfaces. ...@@ -1905,7 +1901,7 @@ interfaces.
Do not append a second underscore to names of entities specified Do not append a second underscore to names of entities specified
in the Fortran source file. in the Fortran source file.
This option has no effect if @samp{-fno-underscoring} is This option has no effect if @option{-fno-underscoring} is
in effect. in effect.
Otherwise, with this option, an external name such as @samp{MAX_COUNT} Otherwise, with this option, an external name such as @samp{MAX_COUNT}
...@@ -1922,7 +1918,7 @@ Ignore the @samp{#ident} directive. ...@@ -1922,7 +1918,7 @@ Ignore the @samp{#ident} directive.
@item -fzeros @item -fzeros
Treat initial values of zero as if they were any other value. Treat initial values of zero as if they were any other value.
As of version 0.5.18, @code{g77} normally treats @code{DATA} and As of version 0.5.18, @command{g77} normally treats @code{DATA} and
other statements that are used to specify initial values of zero other statements that are used to specify initial values of zero
for variables and arrays as if no values were actually specified, for variables and arrays as if no values were actually specified,
in the sense that no diagnostics regarding multiple initializations in the sense that no diagnostics regarding multiple initializations
...@@ -1931,11 +1927,11 @@ are produced. ...@@ -1931,11 +1927,11 @@ are produced.
This is done to speed up compiling of programs that initialize This is done to speed up compiling of programs that initialize
large arrays to zeros. large arrays to zeros.
Use @samp{-fzeros} to revert to the simpler, slower behavior Use @option{-fzeros} to revert to the simpler, slower behavior
that can catch multiple initializations by keeping track of that can catch multiple initializations by keeping track of
all initializations, zero or otherwise. all initializations, zero or otherwise.
@emph{Caution:} Future versions of @code{g77} might disregard this option @emph{Caution:} Future versions of @command{g77} might disregard this option
(and its negative form, the default) or interpret it somewhat (and its negative form, the default) or interpret it somewhat
differently. differently.
The interpretation changes will affect only non-standard The interpretation changes will affect only non-standard
...@@ -1946,29 +1942,31 @@ programs; standard-conforming programs should not be affected. ...@@ -1946,29 +1942,31 @@ programs; standard-conforming programs should not be affected.
@item -femulate-complex @item -femulate-complex
Implement @code{COMPLEX} arithmetic via emulation, Implement @code{COMPLEX} arithmetic via emulation,
instead of using the facilities of instead of using the facilities of
the @code{gcc} back end that provide direct support of the @command{gcc} back end that provide direct support of
@code{complex} arithmetic. @code{complex} arithmetic.
(@code{gcc} had some bugs in its back-end support (@command{gcc} had some bugs in its back-end support
for @code{complex} arithmetic, due primarily to the support not being for @code{complex} arithmetic, due primarily to the support not being
completed as of version 2.8.1 and @code{egcs} 1.1.2.) completed as of version 2.8.1 and @code{egcs} 1.1.2.)
Use @samp{-femulate-complex} if you suspect code-generation bugs, Use @option{-femulate-complex} if you suspect code-generation bugs,
or experience compiler crashes, or experience compiler crashes,
that might result from @code{g77} using the @code{COMPLEX} support that might result from @command{g77} using the @code{COMPLEX} support
in the @code{gcc} back end. in the @command{gcc} back end.
If using that option fixes the bugs or crashes you are seeing, If using that option fixes the bugs or crashes you are seeing,
that indicates a likely @code{g77} bugs that indicates a likely @command{g77} bugs
(though, all compiler crashes are considered bugs), (though, all compiler crashes are considered bugs),
so, please report it. so, please report it.
(Note that the known bugs, now believed fixed, produced compiler crashes (Note that the known bugs, now believed fixed, produced compiler crashes
rather than causing the generation of incorrect code.) rather than causing the generation of incorrect code.)
Use of this option should not affect how Fortran code compiled Use of this option should not affect how Fortran code compiled
by @code{g77} works in terms of its interfaces to other code, by @command{g77} works in terms of its interfaces to other code,
e.g. that compiled by @code{f2c}. e.g. that compiled by @command{f2c}
As of GCC version 3.0, this option is not necessary anymore.
@emph{Caution:} Future versions of @code{g77} might ignore both forms @emph{Caution:} Future versions of @command{g77} might ignore both forms
of this option. of this option.
@cindex -falias-check option @cindex -falias-check option
...@@ -1985,7 +1983,7 @@ of this option. ...@@ -1985,7 +1983,7 @@ of this option.
@item -fno-argument-noalias-global @item -fno-argument-noalias-global
@emph{Version info:} @emph{Version info:}
These options are not supported by These options are not supported by
versions of @code{g77} based on @code{gcc} version 2.8. versions of @command{g77} based on @command{gcc} version 2.8.
These options specify to what degree aliasing These options specify to what degree aliasing
(overlap) (overlap)
...@@ -1994,11 +1992,11 @@ arguments (passed as pointers) and @code{COMMON} (external, or ...@@ -1994,11 +1992,11 @@ arguments (passed as pointers) and @code{COMMON} (external, or
public) storage. public) storage.
The default for Fortran code, as mandated by the FORTRAN 77 and The default for Fortran code, as mandated by the FORTRAN 77 and
Fortran 90 standards, is @samp{-fargument-noalias-global}. Fortran 90 standards, is @option{-fargument-noalias-global}.
The default for code written in the C language family is The default for code written in the C language family is
@samp{-fargument-alias}. @option{-fargument-alias}.
Note that, on some systems, compiling with @samp{-fforce-addr} in Note that, on some systems, compiling with @option{-fforce-addr} in
effect can produce more optimal code when the default aliasing effect can produce more optimal code when the default aliasing
options are in effect (and when optimization is enabled). options are in effect (and when optimization is enabled).
...@@ -2020,7 +2018,7 @@ that might cause a compiler crash when attempting ...@@ -2020,7 +2018,7 @@ that might cause a compiler crash when attempting
to inline a reference to a procedure within a to inline a reference to a procedure within a
program unit. program unit.
(The diagnostics themselves are still produced, but (The diagnostics themselves are still produced, but
as warnings, unless @samp{-Wno-globals} is specified, as warnings, unless @option{-Wno-globals} is specified,
in which case no relevant diagnostics are produced.) in which case no relevant diagnostics are produced.)
Further, this option disables such inlining, to Further, this option disables such inlining, to
...@@ -2030,17 +2028,17 @@ code that would otherwise be diagnosed. ...@@ -2030,17 +2028,17 @@ code that would otherwise be diagnosed.
As such, this option might be quite useful when As such, this option might be quite useful when
compiling existing, ``working'' code that happens compiling existing, ``working'' code that happens
to have a few bugs that do not generally show themselves, to have a few bugs that do not generally show themselves,
but which @code{g77} diagnoses. but which @command{g77} diagnoses.
Use of this option therefore has the effect of Use of this option therefore has the effect of
instructing @code{g77} to behave more like it did instructing @command{g77} to behave more like it did
up through version 0.5.19.1, when it paid little or up through version 0.5.19.1, when it paid little or
no attention to disagreements between program units no attention to disagreements between program units
about a procedure's type and argument information, about a procedure's type and argument information,
and when it performed no inlining of procedures and when it performed no inlining of procedures
(except statement functions). (except statement functions).
Without this option, @code{g77} defaults to performing Without this option, @command{g77} defaults to performing
the potentially inlining procedures as it started doing the potentially inlining procedures as it started doing
in version 0.5.20, but as of version 0.5.21, it also in version 0.5.20, but as of version 0.5.21, it also
diagnoses disagreements that might cause such inlining diagnoses disagreements that might cause such inlining
...@@ -2060,7 +2058,7 @@ instead of its @code{ARRAY_REF} construct ...@@ -2060,7 +2058,7 @@ instead of its @code{ARRAY_REF} construct
to handle all array references. to handle all array references.
@emph{Note:} This option is not supported. @emph{Note:} This option is not supported.
It is intended for use only by @code{g77} developers, It is intended for use only by @command{g77} developers,
to evaluate code-generation issues. to evaluate code-generation issues.
It might be removed at any time. It might be removed at any time.
...@@ -2082,22 +2080,22 @@ against the (locally) declared minimum and maximum values. ...@@ -2082,22 +2080,22 @@ against the (locally) declared minimum and maximum values.
The current implementation uses the @code{libf2c} The current implementation uses the @code{libf2c}
library routine @code{s_rnge} to print the diagnostic. library routine @code{s_rnge} to print the diagnostic.
However, whereas @code{f2c} generates a single check per However, whereas @command{f2c} generates a single check per
reference for a multi-dimensional array, of the computed reference for a multi-dimensional array, of the computed
offset against the valid offset range (0 through the size of the array), offset against the valid offset range (0 through the size of the array),
@code{g77} generates a single check per @emph{subscript} expression. @command{g77} generates a single check per @emph{subscript} expression.
This catches some cases of potential bugs that @code{f2c} does not, This catches some cases of potential bugs that @command{f2c} does not,
such as references to below the beginning of an assumed-size array. such as references to below the beginning of an assumed-size array.
@code{g77} also generates checks for @code{CHARACTER} substring references, @command{g77} also generates checks for @code{CHARACTER} substring references,
something @code{f2c} currently does not do. something @command{f2c} currently does not do.
Use the new @samp{-ffortran-bounds-check} option Use the new @option{-ffortran-bounds-check} option
to specify bounds-checking for only the Fortran code you are compiling, to specify bounds-checking for only the Fortran code you are compiling,
not necessarily for code written in other languages. not necessarily for code written in other languages.
@emph{Note:} To provide more detailed information on the offending subscript, @emph{Note:} To provide more detailed information on the offending subscript,
@code{g77} provides the @code{libg2c} run-time library routine @code{s_rnge} @command{g77} provides the @code{libg2c} run-time library routine @code{s_rnge}
with somewhat differently-formatted information. with somewhat differently-formatted information.
Here's a sample diagnostic: Here's a sample diagnostic:
...@@ -2127,7 +2125,7 @@ the offended substring position is the starting (leftmost) position, ...@@ -2127,7 +2125,7 @@ the offended substring position is the starting (leftmost) position,
and the offending substring expression is @samp{11}. and the offending substring expression is @samp{11}.
(Though the verbage of @code{s_rnge} is not ideal (Though the verbage of @code{s_rnge} is not ideal
for the purpose of the @code{g77} compiler, for the purpose of the @command{g77} compiler,
the above information should provide adequate diagnostic abilities the above information should provide adequate diagnostic abilities
to it users.) to it users.)
@end table @end table
...@@ -2135,11 +2133,11 @@ to it users.) ...@@ -2135,11 +2133,11 @@ to it users.)
@xref{Code Gen Options,,Options for Code Generation Conventions, @xref{Code Gen Options,,Options for Code Generation Conventions,
gcc,Using and Porting GNU CC}, for information on more options gcc,Using and Porting GNU CC}, for information on more options
offered by the GBE offered by the GBE
shared by @code{g77}, @code{gcc}, and other GNU compilers. shared by @command{g77} @command{gcc} and other GNU compilers.
Some of these do @emph{not} work when compiling programs written in Fortran: Some of these do @emph{not} work when compiling programs written in Fortran:
@table @code @table @gcctabopt
@cindex -fpcc-struct-return option @cindex -fpcc-struct-return option
@cindex options, -fpcc-struct-return @cindex options, -fpcc-struct-return
@item -fpcc-struct-return @item -fpcc-struct-return
...@@ -2148,7 +2146,7 @@ Some of these do @emph{not} work when compiling programs written in Fortran: ...@@ -2148,7 +2146,7 @@ Some of these do @emph{not} work when compiling programs written in Fortran:
@item -freg-struct-return @item -freg-struct-return
You should not use these except strictly the same way as you You should not use these except strictly the same way as you
used them to build the version of @code{libg2c} with which used them to build the version of @code{libg2c} with which
you will be linking all code compiled by @code{g77} with the you will be linking all code compiled by @command{g77} with the
same option. same option.
@cindex -fshort-double option @cindex -fshort-double option
...@@ -2180,7 +2178,7 @@ at the very least, even if it is built with the same option. ...@@ -2180,7 +2178,7 @@ at the very least, even if it is built with the same option.
GNU Fortran currently does not make use of any environment GNU Fortran currently does not make use of any environment
variables to control its operation above and beyond those variables to control its operation above and beyond those
that affect the operation of @code{gcc}. that affect the operation of @command{gcc}.
@xref{Environment Variables,,Environment Variables Affecting GNU CC, @xref{Environment Variables,,Environment Variables Affecting GNU CC,
gcc,Using and Porting GNU CC}, for information on environment gcc,Using and Porting GNU CC}, for information on environment
......
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