Skip to content

R
riscv-gcc-1
Commit e847d3bf by Manuel López-Ibáñez
Options

invoke.texi (Wextra): Move it just after Wall... 

2007-10-16  Manuel Lopez-Ibanez  <manu@gcc.gnu.org>

	* doc/invoke.texi (Wextra): Move it just after Wall, list the
	options enabled by Wextra and mention Wuninitialized.

From-SVN: r129373
parent cc0a3c3a
Showing with 69 additions and 96 deletions
gcc/ChangeLog
2007-10-16 Manuel Lopez-Ibanez <manu@gcc.gnu.org>
* doc/invoke.texi (Wextra): Move it just after Wall, list the
options enabled by Wextra and mention Wuninitialized.
2007-10-15 Nigel Stephens <nigel@mips.com>
* config/mips/mips.h (LOCAL_ALIGNMENT): Define.
gcc/doc/invoke.texi
......@@ -2623,7 +2623,7 @@ Options} and @ref{Objective-C and Objective-C++ Dialect Options}.
-Wstrict-overflow @gol
-Wswitch @gol
-Wtrigraphs @gol
-Wuninitialized @r{(only with} @option{-O1}@r{,} @option{-O2} @r{or} @option{-O3}@r{)} @gol
-Wuninitialized @r{(only with} @option{-O1} @r{and above)} @gol
-Wunknown-pragmas @gol
-Wunused-function @gol
-Wunused-label @gol
......@@ -2631,6 +2631,67 @@ Options} and @ref{Objective-C and Objective-C++ Dialect Options}.
-Wunused-variable @gol
}
Note that some warning flags are not implied by @option{-Wall}. Some of
them warn about constructions that users generally do not consider
questionable, but which occasionally you might wish to check for;
others warn about constructions that are necessary or hard to avoid in
some cases, and there is no simple way to modify the code to suppress
the warning. Some of them are enabled by @option{-Wextra} but many of
them must be enabled individually.
@item -Wextra
@opindex W
@opindex Wextra
This enables some extra warning flags that are not enabled by
@option{-Wall}. (This option used to be called @option{-W}. The older
name is still supported, but the newer name is more descriptive.)
@gccoptlist{-Wclobbered @gol
-Wempty-body @gol
-Wmissing-field-initializers @gol
-Wmissing-parameter-type @r{(C only)} @gol
-Wold-style-declaration @r{(C only)} @gol
-Woverride-init @gol
-Wsign-compare @gol
-Wtype-limits @gol
-Wuninitialized @r{(only with} @option{-O1} @r{and above)} @gol
-Wunused-parameter @r{(only with} @option{-Wunused} @r{or}
@option{-Wall}@r{)} @gol
}
The option @option{-Wextra} also prints warning messages for the
following cases:
@itemize @bullet
@item
A pointer is compared against integer zero with @samp{<}, @samp{<=},
@samp{>}, or @samp{>=}.
@item
(C++ only) An enumerator and a non-enumerator both appear in a
conditional expression.
@item
(C++ only) A non-static reference or non-static @samp{const} member
appears in a class without constructors.
@item
(C++ only) Ambiguous virtual bases.
@item
(C++ only) Subscripting an array which has been declared @samp{register}.
@item
(C++ only) Taking the address of a variable which has been declared
@samp{register}.
@item
(C++ only) A base class is not initialized in a derived class' copy
constructor.
@end itemize
@item -Wno-import
@opindex Wno-import
Inhibit warning messages about the use of @samp{#import}.
......@@ -3086,7 +3147,8 @@ Some spurious warnings can be avoided if you declare all the functions
you use that never return as @code{noreturn}. @xref{Function
Attributes}.
This warning is enabled by @option{-Wall}.
This warning is enabled by @option{-Wall} or @option{-Wextra} in
optimizing compilations (@option{-O1} and above).
@item -Wunknown-pragmas
@opindex Wunknown-pragmas
......@@ -3207,100 +3269,6 @@ This option is only active when @option{-ftree-vrp} is active
(default for -O2 and above). It warns about subscripts to arrays
that are always out of bounds. This warning is enabled by @option{-Wall}.
@end table
The following @option{-W@dots{}} options are not implied by @option{-Wall}.
Some of them warn about constructions that users generally do not
consider questionable, but which occasionally you might wish to check
for; others warn about constructions that are necessary or hard to avoid
in some cases, and there is no simple way to modify the code to suppress
the warning.
@table @gcctabopt
@item -Wextra
@opindex W
@opindex Wextra
(This option used to be called @option{-W}. The older name is still
supported, but the newer name is more descriptive.) Print extra warning
messages for these events:
@itemize @bullet
@item
Warn if a comparison is always true or always false due to the limited
range of the data type, but do not warn for constant expressions. For
example, warn if an unsigned variable is compared against zero with
@samp{<} or @samp{>=}. This warning can be independently controlled
by @option{-Wtype-limits}.
@item @r{(C only)}
Storage-class specifiers like @code{static} are not the first things
in a declaration. According to the C Standard, this usage is
obsolescent. This warning can be independently controlled by
@option{-Wold-style-declaration}.
@item
If @option{-Wall} or @option{-Wunused} is also specified, warn about unused
arguments.
@item
A comparison between signed and unsigned values could produce an
incorrect result when the signed value is converted to unsigned.
(But don't warn if @option{-Wno-sign-compare} is also specified.)
@item
An aggregate has an initializer which does not initialize all members.
This warning can be independently controlled by
@option{-Wmissing-field-initializers}.
@item
An initialized field without side effects is overridden when using
designated initializers (@pxref{Designated Inits, , Designated
Initializers}). This warning can be independently controlled by
@option{-Woverride-init}.
@item @r{(C only)}
A function parameter is declared without a type specifier in K&R-style
functions. This warning can be independently controlled by
@option{-Wmissing-parameter-type}.
@item
An empty body occurs in an @samp{if}, @samp{else} or
@samp{do while} statement. This warning can be independently
controlled by @option{-Wempty-body}.
@item @r{(C++ only)}
An empty body occurs in a @samp{while} or @samp{for} statement with no
whitespacing before the semicolon. This warning can be independently
controlled by @option{-Wempty-body}.
@item
A pointer is compared against integer zero with @samp{<}, @samp{<=},
@samp{>}, or @samp{>=}.
@item
A variable might be changed by @samp{longjmp} or @samp{vfork}.
This warning can be independently controlled by @option{-Wclobbered}.
@item @r{(C++ only)}
An enumerator and a non-enumerator both appear in a conditional expression.
@item @r{(C++ only)}
A non-static reference or non-static @samp{const} member appears in a
class without constructors.
@item @r{(C++ only)}
Ambiguous virtual bases.
@item @r{(C++ only)}
Subscripting an array which has been declared @samp{register}.
@item @r{(C++ only)}
Taking the address of a variable which has been declared @samp{register}.
@item @r{(C++ only)}
A base class is not initialized in a derived class' copy constructor.
@end itemize
@item -Wno-div-by-zero
@opindex Wno-div-by-zero
@opindex Wdiv-by-zero
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment