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     && !defined LIBC_NONSHARED
   5 asm ("memmove = __GI_memmove");
   6 asm ("memset = __GI_memset");
   7 asm ("memcpy = __GI_memcpy");
   8
   9 /* Some targets do not use __stack_chk_fail_local.  In libc.so,
  10    redirect __stack_chk_fail to a hidden reference
  11    __stack_chk_fail_local, to avoid the PLT reference.
  12    __stack_chk_fail itself is a global symbol, exported from libc.so,
  13    and cannot be made hidden.  */
  14
  15 # if IS_IN (libc) && defined SHARED \
  16   && defined STACK_PROTECTOR_LEVEL && STACK_PROTECTOR_LEVEL > 0
  17 asm (".hidden __stack_chk_fail_local\n"
  18      "__stack_chk_fail = __stack_chk_fail_local");
  19 # endif
  20 #endif