[Bug c/45286] kact.sa_restorer = &restore_rt; in sigaction.c glibc get miss compile with -fPIE on x86_64

["jakub at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>]

------- Comment #16 from jakub at gcc dot gnu dot org  2010-08-16 11:16 -------
Re: #c12, the difference is because the source code is different.
In the first preprocessed source, restore_rt isn't hidden, in the latter it is.
So, in the first case (-fPIE) gcc can't assume __restore_rt is defined in the
same shared library or binary, in the latter case it can.
Shorter testcase is:
extern void foo (void) asm ("baz")
#ifdef HIDDEN
__attribute__((visibility ("hidden")))
#endif
;
void *bar (void)
{
  return &foo;
}
asm (".text; .type baz, @function; baz: nop; .previous");

-fpie vs. -fpic -DHIDDEN, the only difference is again:
-       movq    baz@GOTPCREL(%rip), %rax
+       leaq    baz(%rip), %rax

So, if there is any bug, it is either on the assembler/ld side, or on the glibc
side or user side, compiling glibc in a way it was never meant to be compiled.


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45286