sysdeps/generic/symbol-hacks.h

   1 /* Some compiler optimizations may transform loops into memset/memmove
   2    calls and without proper declaration it may generate PLT calls.  */
   3 #if !defined __ASSEMBLER__ && IS_IN (libc) && defined SHARED
   4 asm ("memmove = __GI_memmove");
   5 asm ("memset = __GI_memset");
   6 asm ("memcpy = __GI_memcpy");
   7
   8 /* Some targets do not use __stack_chk_fail_local.  In libc.so,
   9    redirect __stack_chk_fail to a hidden reference
  10    __stack_chk_fail_local, to avoid the PLT reference.
  11    __stack_chk_fail itself is a global symbol, exported from libc.so,
  12    and cannot be made hidden.  */
  13
  14 # if IS_IN (libc) && defined SHARED && \
  15   defined STACK_PROTECTOR_LEVEL && STACK_PROTECTOR_LEVEL > 0
  16 asm (".hidden __stack_chk_fail_local\n"
  17      "__stack_chk_fail = __stack_chk_fail_local");
  18 # endif
  19 #endif