clang/test/Sema/pointer-subtract-compat.c

   1 // RUN: %clang_cc1 %s -fsyntax-only -verify -pedantic
   2
   3 typedef const char rchar;
   4 int a(char* a, rchar* b) {
   5   return a-b;
   6 }
   7
   8 void f0(void (*fp)(void)) {
   9   int x = fp - fp; // expected-warning{{arithmetic on pointers to the function type 'void (void)' is a GNU extension}}
  10 }