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| author | Joseph Myers <jsm28@cam.ac.uk> | 2001-11-18 03:30:57 +0000 |
|---|---|---|
| committer | Joseph Myers <jsm28@gcc.gnu.org> | 2001-11-18 03:30:57 +0000 |
| commit | 7d14c755ce793f99c3e833e7115d954cfbed175c (patch) | |
| tree | 3bf2e6da7732b3b856461efc1c4fffe0eba2760d /gcc/doc/invoke.texi | |
| parent | 74a3070ffad610701440467a2bd0b6627a76e568 (diff) | |
| download | gcc-7d14c755ce793f99c3e833e7115d954cfbed175c.zip gcc-7d14c755ce793f99c3e833e7115d954cfbed175c.tar.gz gcc-7d14c755ce793f99c3e833e7115d954cfbed175c.tar.bz2 | |
c-common.c (struct disabled_builtin, [...]): New.
* c-common.c (struct disabled_builtin, disabled_builtins,
disable_builtin_function, builtin_function_disabled_p): New.
(builtin_function_2): Check for disabled built-in functions.
* c-common.h (disable_builtin_function): Declare.
* c-decl.c (c_decode_option): Handle -fno-builtin-FUNCTION.
* doc/invoke.texi: Document -fno-builtin-FUNCTION.
* doc/extend.texi: Mention -fno-builtin-FUNCTION.
testsuite:
* gcc.dg/no-builtin-1.c: New test.
From-SVN: r47133
Diffstat (limited to 'gcc/doc/invoke.texi')
| -rw-r--r-- | gcc/doc/invoke.texi | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index c8bfd474..83e5c97 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -162,7 +162,7 @@ in the following sections. @xref{C Dialect Options,,Options Controlling C Dialect}. @gccoptlist{ -ansi -std=@var{standard} -aux-info @var{filename} @gol --fno-asm -fno-builtin @gol +-fno-asm -fno-builtin -fno-builtin-@var{function} @gol -fhosted -ffreestanding @gol -trigraphs -traditional -traditional-cpp @gol -fallow-single-precision -fcond-mismatch @gol @@ -1025,6 +1025,7 @@ switch only affects the @code{asm} and @code{typeof} keywords, since @code{inline} is a standard keyword in ISO C99. @item -fno-builtin +@itemx -fno-builtin-@var{function} @r{(C and Objective-C only)} @opindex fno-builtin @cindex built-in functions Don't recognize built-in functions that do not begin with @@ -1049,6 +1050,20 @@ using the @samp{__builtin_} prefix. The GNU C++ Standard Library uses built-in functions to implement many functions (like @code{std::strchr}), so that you automatically get efficient code. +With the @option{-fno-builtin-@var{function}} option, not available +when compiling C++, only the built-in function @var{function} is +disabled. @var{function} must not begin with @samp{__builtin_}. If a +function is named this is not built-in in this version of GCC, this +option is ignored. There is no corresponding +@option{-fbuiltin-@var{function}} option; if you wish to enable +built-in functions selectively when using @option{-fno-builtin} or +@option{-ffreestanding}, you may define macros such as: + +@smallexample +#define abs(n) __builtin_abs ((n)) +#define strcpy(d, s) __builtin_strcpy ((d), (s)) +@end smallexample + @item -fhosted @opindex fhosted @cindex hosted environment |