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[clang] Add test for C++ DR2390

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DR2390 clarifies that the argument to __has_cpp_attribute() needs to be
macro-expanded. Clang already supports this and tests it explicitly in
clang/test/Preprocessor/has_attribute.cpp.

Copy the test over to clang/test/CXX/drs/ so the make_cxx_drs script
picks it up.

Differential Revision: https://reviews.llvm.org/D119230
This commit is contained in:
Timm Bäder 2022-02-08 11:12:28 +01:00
parent ce07de234b
commit ef2c8274df
1 changed files with 47 additions and 0 deletions
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47
clang/test/CXX/drs/dr2390.cpp Normal file
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// RUN: %clang_cc1 -E -P %s -o - | FileCheck %s
// dr2390: yes
namespace PR48462 {
// Test that macro expansion of the builtin argument works.
#define C clang
#define F fallthrough
#define CF clang::fallthrough
#if __has_cpp_attribute(F)
int has_fallthrough;
#endif
// CHECK: int has_fallthrough;
#if __has_cpp_attribute(C::F)
int has_clang_fallthrough_1;
#endif
// CHECK: int has_clang_fallthrough_1;
#if __has_cpp_attribute(clang::F)
int has_clang_fallthrough_2;
#endif
// CHECK: int has_clang_fallthrough_2;
#if __has_cpp_attribute(C::fallthrough)
int has_clang_fallthrough_3;
#endif
// CHECK: int has_clang_fallthrough_3;
#if __has_cpp_attribute(CF)
int has_clang_fallthrough_4;
#endif
// CHECK: int has_clang_fallthrough_4;
#define FUNCLIKE1(x) clang::x
#if __has_cpp_attribute(FUNCLIKE1(fallthrough))
int funclike_1;
#endif
// CHECK: int funclike_1;
#define FUNCLIKE2(x) _Clang::x
#if __has_cpp_attribute(FUNCLIKE2(fallthrough))
int funclike_2;
#endif
// CHECK: int funclike_2;
} // namespace PR48462