diff options
Diffstat (limited to 'contrib/gcc/invoke.texi')
| -rw-r--r-- | contrib/gcc/invoke.texi | 53 |
1 files changed, 15 insertions, 38 deletions
diff --git a/contrib/gcc/invoke.texi b/contrib/gcc/invoke.texi index 571348e151fc..adf167fc0212 100644 --- a/contrib/gcc/invoke.texi +++ b/contrib/gcc/invoke.texi @@ -93,7 +93,7 @@ in the following sections. @item C Language Options @xref{C Dialect Options,,Options Controlling C Dialect}. @smallexample --ansi -fstd -fallow-single-precision -fcond-mismatch -fno-asm +-ansi -flang-isoc9x -fallow-single-precision -fcond-mismatch -fno-asm -fno-builtin -ffreestanding -fhosted -fsigned-bitfields -fsigned-char -funsigned-bitfields -funsigned-char -fwritable-strings -traditional -traditional-cpp -trigraphs @@ -667,37 +667,14 @@ programs that might use these names for other things. The functions @code{alloca}, @code{abort}, @code{exit}, and @code{_exit} are not builtin functions when @samp{-ansi} is used. -@item -fstd= -Determine the language standard. A value for this option must be provided; -possible values are +@item -flang-isoc9x +Enable support for features found in the C9X standard. In particular, +enable support for the C9X @code{restrict} keyword. -@itemize @minus -@item iso9899:1990 -Same as -ansi - -@item iso9899:199409 -ISO C as modified in amend. 1 - -@item iso9899:199x -ISO C 9x - -@item c89 -same as -std=iso9899:1990 - -@item c9x -same as -std=iso9899:199x - -@item gnu89 -default, iso9899:1990 + gnu extensions - -@item gnu9x -iso9899:199x + gnu extensions -@end itemize - -Even when this option is not specified, you can still use some of the -features of newer standards in so far as they do not conflict with -previous C standards. For example, you may use @code{__restrict__} even -when -fstd=c9x is not specified. +Even when this option is not specified, you can still use some C9X +features in so far as they do not conflict with previous C standards. +For example, you may use @code{__restrict__} even when -flang-isoc9x +is not specified. @item -fno-asm Do not recognize @code{asm}, @code{inline} or @code{typeof} as a @@ -2225,10 +2202,10 @@ perform loop unrolling or function inlining when you specify @samp{-O2}. As compared to @samp{-O}, this option increases both compilation time and the performance of the generated code. -@samp{-O2} turns on all optional optimizations except for loop unrolling, -function inlining, and strict aliasing optimizations. It also turns on the -@samp{-fforce-mem} option on all machines and frame pointer elimination on -machines where doing so does not interfere with debugging. +@samp{-O2} turns on all optional optimizations except for loop unrolling +and function inlining. It also turns on the @samp{-fforce-mem} option +on all machines and frame pointer elimination on machines where doing so +does not interfere with debugging. @item -O3 Optimize yet more. @samp{-O3} turns on all optimizations specified by @@ -2386,9 +2363,9 @@ math functions. @c --mew 26jan93 The following options control specific optimizations. The @samp{-O2} option turns on all of these optimizations except @samp{-funroll-loops} -@samp{-funroll-all-loops}, and @samp{-fstrict-aliasing}. On most machines, the -@samp{-O} option turns on the @samp{-fthread-jumps} and @samp{-fdelayed-branch} -options, but specific machines may handle it differently. +and @samp{-funroll-all-loops}. On most machines, the @samp{-O} option +turns on the @samp{-fthread-jumps} and @samp{-fdelayed-branch} options, +but specific machines may handle it differently. You can use the following flags in the rare cases when ``fine-tuning'' of optimizations to be performed is desired. |