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
func(void)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
31