gcc/testsuite/gcc.dg/c99-complit-2.c

   1 /* Test for compound literals: in C99 only.  Test for invalid uses.  */
   2 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
   3 /* { dg-do compile } */
   4 /* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
   5
   6 struct s { int a; int b; };
   7 union u { int c; int d; };
   8
   9 struct si;
  10 union ui;
  11
  12 void
  13 foo (int a)
  14 {
  15   /* The type name must not be incomplete (apart from arrays of unknown
  16      size), or a function type, or a VLA type.  */
  17   (void) { 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  18   /* { dg-error "init" "void type" { target *-*-* } .-1 } */
  19   &(struct si) { 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  20   /* { dg-error "init" "incomplete struct type" { target *-*-* } .-1 } */
  21   /* { dg-error "invalid use of undefined type" "" { target *-*-* } .-2 } */
  22   &(union ui) { 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  23   /* { dg-error "init" "incomplete union type" { target *-*-* } .-1 } */
  24   /* { dg-error "invalid use of undefined type" "" { target *-*-* } .-2 } */
  25   (void (void)) { 0 }; /* { dg-bogus "warning" "warning in place of error" } */
  26   /* { dg-error "init" "function type" { target *-*-* } .-1 } */
  27   (int [a]) { 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  28   /* { dg-error "init|variable" "VLA type" { target *-*-* } .-1 } */
  29   /* Initializers must not attempt to initialize outside the object
  30      declared.  */
  31   (int [1]) { [1] = 2 }; /* { dg-bogus "warning" "warning in place of error" } */
  32   /* { dg-error "init" "value outside array" { target *-*-* } .-1 } */
  33   (int [1]) { [-1] = 2 }; /* { dg-bogus "warning" "warning in place of error" } */
  34   /* { dg-error "init" "value outside array" { target *-*-* } .-1 } */
  35   (int [1]) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  36   /* { dg-error "init" "value outside array" { target *-*-* } .-1 } */
  37 }
  38
  39 int z;
  40
  41 /* Outside a function, initializers must be constant.  */
  42 struct s *s0 = &(struct s) { 0, z }; /* { dg-bogus "warning" "warning in place of error" } */
  43 /* { dg-error "init" "non-const" { target *-*-* } .-1 } */
  44 int sz = sizeof((struct s) { 0, z }); /* { dg-bogus "warning" "warning in place of error" } */
  45 /* { dg-error "init" "non-const" { target *-*-* } .-1 } */
  46
  47 /* Compound literals aren't themselves constant expressions.  */
  48 int x = (int) { 0 }; /* { dg-bogus "warning" "warning in place of error" } */
  49 /* { dg-error "init" "non-const" { target *-*-* } .-1 } */
  50
  51 /* Nor are they suitable structure or union initializers
  52    outside a function.  */
  53 struct s s1 = (struct s) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  54 /* { dg-error "init" "struct bad init" { target *-*-* } .-1 } */
  55 union u u1 = (union u) { 0 }; /* { dg-bogus "warning" "warning in place of error" } */
  56 /* { dg-error "init" "union bad init" { target *-*-* } .-1 } */
  57
  58 /* They aren't suitable for array initializers, either inside or outside
  59    a function.  */
  60 int y[2] = (int [2]) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  61 /* { dg-error "init" "array bad init" { target *-*-* } .-1 } */
  62
  63 void
  64 bar (void)
  65 {
  66   struct s s2 = (struct s) { 0, 1 };
  67   union u u2 = (union u) { 0 };
  68   int z[2] = (int [2]) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  69   /* { dg-error "init" "array bad init" { target *-*-* } .-1 } */
  70 }