clang/test/Sema/warn-sizeof-array-decay.c

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 void f(int x) {
   4   char foo[10];
   5   int bar[20];
   6   char qux[30];
   7
   8   (void)sizeof(bar + 10); // expected-warning{{sizeof on pointer operation will return size of 'int *' instead of 'int[20]'}}
   9   (void)sizeof(foo - 20); // expected-warning{{sizeof on pointer operation will return size of 'char *' instead of 'char[10]'}}
  10   (void)sizeof(bar - x); // expected-warning{{sizeof on pointer operation will return size of 'int *' instead of 'int[20]'}}
  11   (void)sizeof(foo + x); // expected-warning{{sizeof on pointer operation will return size of 'char *' instead of 'char[10]'}}
  12
  13   // This is ptrdiff_t.
  14   (void)sizeof(foo - qux); // no-warning
  15
  16   (void)sizeof(foo, x); // no-warning
  17   (void)sizeof(x, foo); // expected-warning{{sizeof on pointer operation will return size of 'char *' instead of 'char[10]'}}
  18 }