clang/test/Preprocessor/has_c_attribute.c

   1 // RUN: %clang_cc1 -fdouble-square-bracket-attributes -std=c11 -E -P %s -o - | FileCheck %s
   2 // RUN: %clang_cc1 -std=c2x -E -P %s -o - | FileCheck %s
   3
   4 #define C2x(x) x: __has_c_attribute(x)
   5
   6 // CHECK: fallthrough: 201910L
   7 C2x(fallthrough)
   8
   9 // CHECK: __nodiscard__: 202003L
  10 C2x(__nodiscard__)
  11
  12 // CHECK: selectany: 0
  13 C2x(selectany); // Known attribute not supported in C mode
  14
  15 // CHECK: frobble: 0
  16 C2x(frobble) // Unknown attribute
  17
  18 // CHECK: frobble::frobble: 0
  19 C2x(frobble::frobble) // Unknown vendor namespace
  20
  21 // CHECK: clang::annotate: 1
  22 C2x(clang::annotate)
  23
  24 // CHECK: deprecated: 201904L
  25 C2x(deprecated)
  26
  27 // CHECK: maybe_unused: 202106L
  28 C2x(maybe_unused)
  29
  30 // CHECK: __gnu__::warn_unused_result: 202003L
  31 C2x(__gnu__::warn_unused_result)
  32
  33 // CHECK: gnu::__warn_unused_result__: 202003L
  34 C2x(gnu::__warn_unused_result__)
  35
  36 // Test that macro expansion of the builtin argument works.
  37 #define C clang
  38 #define L likely
  39 #define CL clang::likely
  40 #define N nodiscard
  41
  42 #if __has_c_attribute(N)
  43 int has_nodiscard;
  44 #endif
  45 // CHECK: int has_nodiscard;
  46
  47 #if __has_c_attribute(C::L)
  48 int has_clang_likely_1;
  49 #endif
  50 // CHECK: int has_clang_likely_1;
  51
  52 #if __has_c_attribute(clang::L)
  53 int has_clang_likely_2;
  54 #endif
  55 // CHECK: int has_clang_likely_2;
  56
  57 #if __has_c_attribute(C::likely)
  58 int has_clang_likely_3;
  59 #endif
  60 // CHECK: int has_clang_likely_3;
  61
  62 #if __has_c_attribute(CL)
  63 int has_clang_likely_4;
  64 #endif
  65 // CHECK: int has_clang_likely_4;
  66
  67 #define FUNCLIKE1(x) clang::x
  68 #if __has_c_attribute(FUNCLIKE1(likely))
  69 int funclike_1;
  70 #endif
  71 // CHECK: int funclike_1;
  72
  73 #define FUNCLIKE2(x) _Clang::x
  74 #if __has_c_attribute(FUNCLIKE2(likely))
  75 int funclike_2;
  76 #endif
  77 // CHECK: int funclike_2;