clang/test/Preprocessor/expr_define_expansion.c

   1 // RUN: %clang_cc1 %s -E -CC -verify
   2 // RUN: %clang_cc1 %s -E -CC -DPEDANTIC -pedantic -verify
   3
   4 #define FOO && 1
   5 #if defined FOO FOO
   6 #endif
   7
   8 #define A
   9 #define B defined(A)
  10 #if B // expected-warning{{macro expansion producing 'defined' has undefined behavior}}
  11 #endif
  12
  13 #define m_foo
  14 #define TEST(a) (defined(m_##a) && a)
  15
  16 #if defined(PEDANTIC)
  17 // expected-warning@+4{{macro expansion producing 'defined' has undefined behavior}}
  18 #endif
  19
  20 // This shouldn't warn by default, only with pedantic:
  21 #if TEST(foo)
  22 #endif
  23
  24
  25 // Only one diagnostic for this case:
  26 #define INVALID defined(
  27 #if INVALID // expected-error{{macro name missing}}
  28 #endif