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 *-*-* } 17 } */
  19   &(struct si) { 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  20   /* { dg-error "init" "incomplete struct type" { target *-*-* } 19 } */
  21   &(union ui) { 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  22   /* { dg-error "init" "incomplete union type" { target *-*-* } 21 } */
  23   (void (void)) { 0 }; /* { dg-bogus "warning" "warning in place of error" } */
  24   /* { dg-error "init" "function type" { target *-*-* } 23 } */
  25   (int [a]) { 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  26   /* { dg-error "init|variable" "VLA type" { target *-*-* } 25 } */
  27   /* Initializers must not attempt to initialize outside the object
  28      declared.  */
  29   (int [1]) { [1] = 2 }; /* { dg-bogus "warning" "warning in place of error" } */
  30   /* { dg-error "init" "value outside array" { target *-*-* } 29 } */
  31   (int [1]) { [-1] = 2 }; /* { dg-bogus "warning" "warning in place of error" } */
  32   /* { dg-error "init" "value outside array" { target *-*-* } 31 } */
  33   (int [1]) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  34   /* { dg-error "init" "value outside array" { target *-*-* } 33 } */
  35 }
  36
  37 int z;
  38
  39 /* Outside a function, initializers must be constant.  */
  40 struct s *s0 = &(struct s) { 0, z }; /* { dg-bogus "warning" "warning in place of error" } */
  41 /* { dg-error "init" "non-const" { target *-*-* } 40 } */
  42 int sz = sizeof((struct s) { 0, z }); /* { dg-bogus "warning" "warning in place of error" } */
  43 /* { dg-error "init" "non-const" { target *-*-* } 42 } */
  44
  45 /* Compound literals aren't themselves constant expressions.  */
  46 int x = (int) { 0 }; /* { dg-bogus "warning" "warning in place of error" } */
  47 /* { dg-error "init" "non-const" { target *-*-* } 46 } */
  48
  49 /* Nor are they suitable structure or union initializers
  50    outside a function.  */
  51 struct s s1 = (struct s) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  52 /* { dg-error "init" "struct bad init" { target *-*-* } 51 } */
  53 union u u1 = (union u) { 0 }; /* { dg-bogus "warning" "warning in place of error" } */
  54 /* { dg-error "init" "union bad init" { target *-*-* } 53 } */
  55
  56 /* They aren't suitable for array initializers, either inside or outside
  57    a function.  */
  58 int y[2] = (int [2]) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  59 /* { dg-error "init" "array bad init" { target *-*-* } 58 } */
  60
  61 void
  62 bar (void)
  63 {
  64   struct s s2 = (struct s) { 0, 1 };
  65   union u u2 = (union u) { 0 };
  66   int z[2] = (int [2]) { 0, 1 }; /* { dg-bogus "warning" "warning in place of error" } */
  67   /* { dg-error "init" "array bad init" { target *-*-* } 66 } */
  68 }