[libcxx-commits] [libcxx] b4a13e4 - [libc++] [test] C++14/17-friendly `TEST_IS_CONSTANT_EVALUATED` macro.

[Arthur O'Dwyer via libcxx-commits]

Author: Arthur O'Dwyer
Date: 2021-12-01T15:02:54-05:00
New Revision: b4a13e4c9835362b40f87350b2efba3e1eaad2be

URL: https://github.com/llvm/llvm-project/commit/b4a13e4c9835362b40f87350b2efba3e1eaad2be
DIFF: https://github.com/llvm/llvm-project/commit/b4a13e4c9835362b40f87350b2efba3e1eaad2be.diff

LOG: [libc++] [test] C++14/17-friendly `TEST_IS_CONSTANT_EVALUATED` macro.

Reviewed as part of D114658.
Ultimately this will probably have to be flipped around and renamed
`TEST_IS_RUNTIME`, and extended with `TEST_IS_RUNTIME_OR_CXX20` (once
constexpr std::string support is added) and so on for every new C++
version. But we don't need that flexibility yet, so we're not adding it.

Added: 
    

Modified: 
    libcxx/test/support/test_macros.h

Removed: 
    


################################################################################
diff  --git a/libcxx/test/support/test_macros.h b/libcxx/test/support/test_macros.h
index afc04b2ad6134..a90a52f8ca5d4 100644
--- a/libcxx/test/support/test_macros.h
+++ b/libcxx/test/support/test_macros.h
@@ -146,9 +146,11 @@
 #endif
 
 #if defined(__cpp_lib_is_constant_evaluated) && __cpp_lib_is_constant_evaluated >= 201811L
-#  define TEST_IS_CONSTANT_EVALUATED std::is_constant_evaluated()
+# define TEST_IS_CONSTANT_EVALUATED std::is_constant_evaluated()
+#elif __has_builtin(__builtin_is_constant_evaluated)
+# define TEST_IS_CONSTANT_EVALUATED __builtin_is_constant_evaluated()
 #else
-#  define TEST_IS_CONSTANT_EVALUATED false
+# define TEST_IS_CONSTANT_EVALUATED false
 #endif
 
 #if TEST_STD_VER >= 14