gcc/testsuite/gcc.dg/wtr-union-init-2.c

   1 /* Test for -Wtraditional warnings on union initialization.
   2    Note, gcc should omit these warnings in system header files.
   3    By Kaveh R. Ghazi <ghazi@caip.rutgers.edu> 9/11/2000.  */
   4 /* { dg-do compile } */
   5 /* { dg-options "-Wtraditional" } */
   6
   7 union foo1
   8 {
   9   float f;
  10   int i;
  11   long l;
  12 };
  13
  14 union foo2
  15 {
  16   int i;
  17   float f;
  18   long l;
  19 };
  20
  21 void
  22 testfunc ()
  23 {
  24   /* Note we only warn for nonzero initializers.  */
  25   static union foo1 f1 = {0};
  26   static union foo2 f2 = {0};
  27   static union foo1 f3 = {1}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
  28   static union foo2 f4 = {1}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
  29   static union foo1 f5 = {0.0};
  30   static union foo2 f6 = {0.0};
  31   static union foo1 f7 = {1.0}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
  32   static union foo2 f8 = {1.0}; /* { dg-warning "traditional C rejects initialization of unions" "initialization of unions" } */
  33
  34 # 35 "sys-header.h" 3
  35 /* We are in system headers now, no -Wtraditional warnings should issue.  */
  36
  37   static union foo1 b1 = {0};
  38   static union foo2 b2 = {0};
  39   static union foo1 b3 = {1};
  40   static union foo2 b4 = {1};
  41   static union foo1 b5 = {0.0};
  42   static union foo2 b6 = {0.0};
  43   static union foo1 b7 = {1.0};
  44   static union foo2 b8 = {1.0};
  45 }