llvm-gcc-4.2/gcc/testsuite/gcc.c-torture/compile/20020303-1.c

/* With -fzero-initialized-in-bss, we made I a common symbol instead
   of a symbol in the .bss section.  Not only does that break semantics,
   but a common symbol can't be weak.  */

int i __attribute__((weak)) = 0;