1 // RUN: %clang_cc1 -verify -fsyntax-only -Wshadow -Wold-style-cast -Wc++20-designator %s 2 3 // Test that macro expansions from system headers don't trigger 'syntactic' 4 // warnings that are not actionable. 5 6 #ifdef IS_SYSHEADER 7 #pragma clang system_header 8 9 #define SANITY(a) (a / 0) 10 11 #define SHADOW(a) __extension__({ int v = a; v; }) 12 13 #define OLD_STYLE_CAST(a) ((int) (a)) 14 15 struct Foo { 16 int x; 17 }; 18 #define DESIGNATED_INITIALIZERS (Foo{.x = 123}) 19 20 #else 21 22 #define IS_SYSHEADER 23 #include __FILE__ 24 testSanity()25void testSanity() { 26 // Validate that the test is set up correctly 27 int i = SANITY(0); // expected-warning {{division by zero is undefined}} 28 } 29 PR16093()30void PR16093() { 31 // no -Wshadow in system macro expansion 32 int i = SHADOW(SHADOW(1)); 33 } 34 PR18147()35void PR18147() { 36 // no -Wold-style-cast in system macro expansion 37 int i = OLD_STYLE_CAST(0); 38 } 39 PR52944()40void PR52944() { 41 // no -Wc++20-designator in system macro expansion 42 auto i = DESIGNATED_INITIALIZERS; 43 } 44 45 #endif 46