clang/test/Preprocessor/_Pragma-in-macro-arg.cpp

   1 // RUN: %clang_cc1 %s -verify -Wconversion
   2
   3 #define P(X) _Pragma(#X)
   4 #define V(X) X
   5
   6 #define X \
   7   P(clang diagnostic push) \
   8   P(clang diagnostic ignored "-Wconversion") \
   9   ) = 1.2; \
  10   P(clang diagnostic pop)
  11
  12 void f() {
  13   int a = 1.2; // expected-warning {{changes value}}
  14
  15   // Note, we intentionally enter a tentatively-parsed context here to trigger
  16   // regular use of lookahead. This would go wrong if _Pragma checking in macro
  17   // argument pre-expansion also tries to use token lookahead.
  18   int (b
  19   V(X)
  20
  21   int c = 1.2; // expected-warning {{changes value}}
  22 }