glibc/sysdeps/generic/symbol-hacks.h

/* Some compiler optimizations may transform loops into memset/memmove
   calls and without proper declaration it may generate PLT calls.  */
#if !defined __ASSEMBLER__ && !defined NOT_IN_libc && defined SHARED
asm ("memmove = __GI_memmove");
asm ("memset = __GI_memset");
asm ("memcpy = __GI_memcpy");
#endif
Fix unsafe compiler optimization GCC 4.8 enables -ftree-loop-distribute-patterns at -O3 by default and this optimization may transform loops into memset/memmove calls. Without proper handling this may generate unexpected PLT calls on GLIBC. This patch fixes by create memset/memmove alias to internal GLIBC __GI_memset/__GI_memmove symbols. 2013-06-12 15:21:22 +00:00			`/* Some compiler optimizations may transform loops into memset/memmove`
			`calls and without proper declaration it may generate PLT calls. */`
			`#if !defined __ASSEMBLER__ && !defined NOT_IN_libc && defined SHARED`
			`asm ("memmove = __GI_memmove");`
			`asm ("memset = __GI_memset");`
More fixes for unsafe compiler optimization GCC 4.9 -ftree-loop-distribute-patterns now may transform loops in memcpy. Add the alias to internal GLIBC symbol to avoid PLT creation. 2014-04-29 19:15:45 +00:00			`asm ("memcpy = __GI_memcpy");`
Fix unsafe compiler optimization GCC 4.8 enables -ftree-loop-distribute-patterns at -O3 by default and this optimization may transform loops into memset/memmove calls. Without proper handling this may generate unexpected PLT calls on GLIBC. This patch fixes by create memset/memmove alias to internal GLIBC __GI_memset/__GI_memmove symbols. 2013-06-12 15:21:22 +00:00			`#endif`