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llvm-project/clang/test/Preprocessor/has_c_attribute.c

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Support the standards-based dates for __has_c_attribute WG14 N2481 was adopted with minor modifications at the latest WG14 meetings. The only modification to the paper was to correct the date for the deprecated attribute to be 201904L (the corrected date value will be present in WG14 N2553 when it gets published).
2020-08-13 20:47:40 +08:00
// RUN: %clang_cc1 -fdouble-square-bracket-attributes -std=c11 -E -P %s -o - | FileCheck %s
// RUN: %clang_cc1 -std=c2x -E -P %s -o - | FileCheck %s
#define C2x(x) x: __has_c_attribute(x)
// CHECK: fallthrough: 201904L
C2x(fallthrough)
// CHECK: __nodiscard__: 201904L
C2x(__nodiscard__)
// CHECK: selectany: 0
C2x(selectany); // Known attribute not supported in C mode
// CHECK: frobble: 0
C2x(frobble) // Unknown attribute
// CHECK: frobble::frobble: 0
C2x(frobble::frobble) // Unknown vendor namespace
// CHECK: clang::annotate: 1
C2x(clang::annotate)
// CHECK: deprecated: 201904L
C2x(deprecated)
// CHECK: maybe_unused: 201904L
C2x(maybe_unused)
// CHECK: __gnu__::warn_unused_result: 201904L
C2x(__gnu__::warn_unused_result)
// CHECK: gnu::__warn_unused_result__: 201904L
C2x(gnu::__warn_unused_result__)
Lex arguments for __has_cpp_attribute and friends as expanded tokens The C and C++ standards require the argument to __has_cpp_attribute and __has_c_attribute to be expanded ([cpp.cond]p5). It would make little sense to expand the argument to those operators but not expand the argument to __has_attribute and __has_declspec, so those were both also changed in this patch. Note that it might make sense for the other builtins to also expand their argument, but it wasn't as clear to me whether the behavior would be correct there, and so they were left for a future revision.
2021-10-17 19:54:48 +08:00
// Test that macro expansion of the builtin argument works.
#define C clang
#define L likely
#define CL clang::likely
#define N nodiscard
#if __has_c_attribute(N)
int has_nodiscard;
#endif
// CHECK: int has_nodiscard;
#if __has_c_attribute(C::L)
int has_clang_likely_1;
#endif
// CHECK: int has_clang_likely_1;
#if __has_c_attribute(clang::L)
int has_clang_likely_2;
#endif
// CHECK: int has_clang_likely_2;
#if __has_c_attribute(C::likely)
int has_clang_likely_3;
#endif
// CHECK: int has_clang_likely_3;
#if __has_c_attribute(CL)
int has_clang_likely_4;
#endif
// CHECK: int has_clang_likely_4;
#define FUNCLIKE1(x) clang::x
#if __has_c_attribute(FUNCLIKE1(likely))
int funclike_1;
#endif
// CHECK: int funclike_1;
#define FUNCLIKE2(x) _Clang::x
#if __has_c_attribute(FUNCLIKE2(likely))
int funclike_2;
#endif
// CHECK: int funclike_2;