clang/test/Sema/zero-initializer.c

   1 // RUN: %clang_cc1 -std=c99 -Wmissing-field-initializers -Wmissing-braces -verify %s
   2
   3 // Tests that using {0} in struct initialization or assignment is supported
   4 struct foo { int x; int y; };
   5 struct bar { struct foo a; struct foo b; };
   6 struct A { int a; };
   7 struct B { struct A a; };
   8 struct C { struct B b; };
   9 struct D { struct C c; int n; };
  10 struct E { short e; };
  11 struct F { struct E e; int n; };
  12
  13 int main(void)
  14 {
  15   struct foo f = { 0 }; // no-warning
  16   struct foo g = { 9 }; // expected-warning {{missing field 'y' initializer}}
  17   struct foo h = { 9, 9 }; // no-warning
  18   struct bar i = { 0 }; // no-warning
  19   struct bar j = { 0, 0 }; // expected-warning {{suggest braces around initialization of subobject}} expected-warning {{missing field 'b' initializer}}
  20   struct bar k = { { 9, 9 }, { 9, 9 } }; // no-warning
  21   struct bar l = { { 9, 9 }, { 0 } }; // no-warning
  22   struct bar m = { { 0 }, { 0 } }; // no-warning
  23   struct bar n = { { 0 }, { 9, 9 } }; // no-warning
  24   struct bar o = { { 9 }, { 9, 9 } }; // expected-warning {{missing field 'y' initializer}}
  25   struct C p = { 0 }; // no-warning
  26   struct C q = { 9 }; // warning suppressed for struct with single element
  27   struct D r = { 9 }; // expected-warning {{suggest braces around initialization of subobject}} expected-warning {{missing field 'n' initializer}}
  28   struct F s = { 0 }; // no-warning
  29   struct F t = { 9 }; // expected-warning {{suggest braces around initialization of subobject}} expected-warning {{missing field 'n' initializer}}
  30
  31   f = (struct foo ) { 0 }; // no-warning
  32   g = (struct foo ) { 9 }; // expected-warning {{missing field 'y' initializer}}
  33   h = (struct foo ) { 9, 9 }; // no-warning
  34   i = (struct bar) { 0 }; // no-warning
  35   j = (struct bar) { 0, 0 }; // expected-warning {{suggest braces around initialization of subobject}} expected-warning {{missing field 'b' initializer}}
  36   k = (struct bar) { { 9, 9 }, { 9, 9 } }; // no-warning
  37   l = (struct bar) { { 9, 9 }, { 0 } }; // no-warning
  38   m = (struct bar) { { 0 }, { 0 } }; // no-warning
  39   n = (struct bar) { { 0 }, { 9, 9 } }; // no-warning
  40   o = (struct bar) { { 9 }, { 9, 9 } }; // expected-warning {{missing field 'y' initializer}}
  41   p = (struct C) { 0 }; // no-warning
  42   q = (struct C) { 9 }; // warning suppressed for struct with single element
  43   r = (struct D) { 9 }; // expected-warning {{suggest braces around initialization of subobject}} expected-warning {{missing field 'n' initializer}}
  44   s = (struct F) { 0 }; // no-warning
  45   t = (struct F) { 9 }; // expected-warning {{suggest braces around initialization of subobject}} expected-warning {{missing field 'n' initializer}}
  46
  47   return 0;
  48 }