clang/test/Sema/empty-init.c

   1 // RUN: %clang_cc1 %s -std=c2x -Wall -pedantic -fsyntax-only -verify=good
   2 // RUN: %clang_cc1 %s -std=c2x -Wpre-c2x-compat -fsyntax-only -verify=c2x
   3 // RUN: %clang_cc1 %s -std=c2x -Wpre-c2x-compat -Wno-gnu-empty-initializer -fsyntax-only -verify=c2x
   4 // RUN: %clang_cc1 %s -std=c2x -Wgnu-empty-initializer -fsyntax-only -verify=good
   5 // RUN: %clang_cc1 %s -std=c17 -Wall -pedantic -fsyntax-only -verify=c2x-ext
   6 // RUN: %clang_cc1 %s -std=c17 -Wgnu-empty-initializer -fsyntax-only -verify=good
   7 // RUN: %clang_cc1 %s -std=c17 -Wc2x-extensions -fsyntax-only -verify=c2x-ext
   8 // RUN: %clang_cc1 %s -std=c17 -Wpre-c2x-compat -fsyntax-only -verify=good
   9
  10 // good-no-diagnostics
  11
  12 // Empty brace initialization used to be a GNU extension, but the feature was
  13 // added to C2x. We now treat empty initialization as a C extension rather than
  14 // a GNU extension. Thus, -Wgnu-empty-initializer is always silently ignored.
  15
  16 struct S {
  17   int a;
  18 };
  19
  20 struct S s = {};     /* c2x-warning {{use of an empty initializer is incompatible with C standards before C23}}
  21                         c2x-ext-warning {{use of an empty initializer is a C23 extension}}
  22                       */
  23
  24 void func(void) {
  25   struct S s2 = {};  /* c2x-warning {{use of an empty initializer is incompatible with C standards before C23}}
  26                         c2x-ext-warning {{use of an empty initializer is a C23 extension}}
  27                       */
  28   (void)s2;
  29 }
  30