1 // RUN: %clang_cc1 -verify -fsyntax-only -Wshadow -Wold-style-cast %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 #else
16 
17 #define IS_SYSHEADER
18 #include __FILE__
19 
testSanity()20 void testSanity() {
21   // Validate that the test is set up correctly
22   int i = SANITY(0); // expected-warning {{division by zero is undefined}}
23 }
24 
PR16093()25 void PR16093() {
26   // no -Wshadow in system macro expansion
27   int i = SHADOW(SHADOW(1));
28 }
29 
PR18147()30 void PR18147() {
31   // no -Wold_style_cast in system macro expansion
32   int i = OLD_STYLE_CAST(0);
33 }
34 
35 #endif
36