[Bug middle-end/36255] -fstrict-aliasing breaks __builtin_va_args

[rguenth at gcc dot gnu dot org]

------- Comment #10 from rguenth at gcc dot gnu dot org  2008-05-17 18:15 
-------
Reduced testcase, works with -fno-strict-aliasing.

unsigned long __attribute__((noinline)) foo (int narg, ...)
{
  unsigned long V1;
  __builtin_va_list args;
  __builtin_va_start (args, narg);
  V1 = (unsigned long)__builtin_va_arg(args, void *);
  /*__builtin_va_end (args);*/
  return V1;
}
extern void abort (void);
int main(int argc, char**argv)
{
  unsigned long x = foo (1, 0x2688612UL);
  if (x != 0x2688612UL)
    abort ();
  return 0;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36255