clang/test/SemaCXX/warn-sysheader-macro.cpp

   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
  25 void testSanity() {
  26   // Validate that the test is set up correctly
  27   int i = SANITY(0); // expected-warning {{division by zero is undefined}}
  28 }
  29
  30 void PR16093() {
  31   // no -Wshadow in system macro expansion
  32   int i = SHADOW(SHADOW(1));
  33 }
  34
  35 void PR18147() {
  36   // no -Wold-style-cast in system macro expansion
  37   int i = OLD_STYLE_CAST(0);
  38 }
  39
  40 void PR52944() {
  41   // no -Wc++20-designator in system macro expansion
  42   auto i = DESIGNATED_INITIALIZERS;
  43 }
  44
  45 #endif