clang/test/CodeGen/2008-01-25-ZeroSizedAggregate.c

   1 // RUN: %clang_cc1 %s -emit-llvm -o -
   2 // REQUIRES: LP64
   3
   4 // Aggregates of size zero should be dropped from argument list.
   5 typedef long int Tlong;
   6 struct S2411 {
   7   __attribute__((aligned)) Tlong:0;
   8 };
   9
  10 extern struct S2411 a2411[5];
  11 extern void checkx2411(struct S2411);
  12 void test2411(void) {
  13   checkx2411(a2411[0]);
  14 }
  15
  16 // Proper handling of zero sized fields during type conversion.
  17 typedef unsigned long long int Tal2ullong __attribute__((aligned(2)));
  18 struct S2525 {
  19  Tal2ullong: 0;
  20  struct {
  21  } e;
  22 };
  23 struct S2525 s2525;
  24
  25 struct {
  26   signed char f;
  27   char :0;
  28   struct{}h;
  29   char * i[5];
  30 } data;
  31
  32 // Taking address of a zero sized field.
  33 struct Z {};
  34 struct Y {
  35   int i;
  36   struct Z z;
  37 };
  38 void *f(struct Y *y) {
  39   return &y->z;
  40 }