gcc/testsuite/gcc.dg/lto/20080924_0.c

/* { dg-lto-do assemble }  */
/* { dg-lto-options {{-O2 -flto -funsigned-char}} }  */ 
typedef unsigned int size_t;
void
foo (const char *src, unsigned char *dst, size_t size)
{
  int ch;
  while ((ch = *src++) != '\0') {
  }
}