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Introduce a new test macro TEST_HAS_C11_FEATURES which is set when the underlying C library has C11 features. In C++17, we use those features. <__config> defines a similar macro, _LIBCPP_HAS_C11_FEATURES, but we don't want to use that in the library-independent parts of the tests, so define the new one. Also add a libc++-specific test to make sure the two stay in sync.

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@338411 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2018-07-31 18:23:57 +00:00
parent decf28e84f
commit 1bef51a0b5
2 changed files with 66 additions and 10 deletions
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29
test/libcxx/language.support/has_c11_features.pass.cpp Normal file
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@@ -0,0 +1,29 @@
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03, c++11, c++14
// We have two macros for checking whether or not the underlying C library
// has C11 features:
// TEST_HAS_C11_FEATURES - which is defined in "test_macros.h"
// _LIBCPP_HAS_C11_FEATURES - which is defined in <__config>
// They should always be the same
#ifdef TEST_HAS_C11_FEATURES
# ifndef _LIBCPP_HAS_C11_FEATURES
# error "TEST_HAS_C11_FEATURES is defined, but _LIBCPP_HAS_C11_FEATURES is not"
# endif
#endif
#ifdef _LIBCPP_HAS_C11_FEATURES
# ifndef TEST_HAS_C11_FEATURES
# error "_LIBCPP_HAS_C11_FEATURES is defined, but TEST_HAS_C11_FEATURES is not"
# endif
#endif
int main() {}

47
test/support/test_macros.h
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@@ -94,16 +94,6 @@
#define TEST_GLIBC_PREREQ(major, minor) __GLIBC_PREREQ(major, minor) #define TEST_GLIBC_PREREQ(major, minor) __GLIBC_PREREQ(major, minor)
#endif #endif
/* Features that were introduced in C++14 */
#if TEST_STD_VER >= 14
#define TEST_HAS_EXTENDED_CONSTEXPR
#define TEST_HAS_VARIABLE_TEMPLATES
#endif
/* Features that were introduced after C++14 */
#if TEST_STD_VER > 14
#endif
#if TEST_STD_VER >= 11 #if TEST_STD_VER >= 11
#define TEST_ALIGNOF(...) alignof(__VA_ARGS__) #define TEST_ALIGNOF(...) alignof(__VA_ARGS__)
#define TEST_ALIGNAS(...) alignas(__VA_ARGS__) #define TEST_ALIGNAS(...) alignas(__VA_ARGS__)
@@ -132,6 +122,43 @@
#define TEST_THROW_SPEC(...) throw(__VA_ARGS__) #define TEST_THROW_SPEC(...) throw(__VA_ARGS__)
#endif #endif
// Sniff out to see if the underling C library has C11 features
// Note that at this time (July 2018), MacOS X and iOS do NOT.
#if __ISO_C_VISIBLE >= 2011
# if defined(__FreeBSD__)
# define TEST_HAS_C11_FEATURES
# elif defined(__Fuchsia__)
# define TEST_HAS_C11_FEATURES
# elif defined(__linux__)
# if !defined(_LIBCPP_HAS_MUSL_LIBC)
# if _LIBCPP_GLIBC_PREREQ(2, 17)
# define TEST_HAS_C11_FEATURES
# endif
# else // defined(_LIBCPP_HAS_MUSL_LIBC)
# define TEST_HAS_C11_FEATURES
# endif
# elif defined(_WIN32)
# if defined(_MSC_VER) && !defined(__MINGW32__)
# define TEST_HAS_C11_FEATURES // Using Microsoft's C Runtime library
# endif
# endif
#endif
/* Features that were introduced in C++14 */
#if TEST_STD_VER >= 14
#define TEST_HAS_EXTENDED_CONSTEXPR
#define TEST_HAS_VARIABLE_TEMPLATES
#endif
/* Features that were introduced in C++17 */
#if TEST_STD_VER >= 17
#endif
/* Features that were introduced after C++17 */
#if TEST_STD_VER > 17
#endif
#define TEST_ALIGNAS_TYPE(...) TEST_ALIGNAS(TEST_ALIGNOF(__VA_ARGS__)) #define TEST_ALIGNAS_TYPE(...) TEST_ALIGNAS(TEST_ALIGNOF(__VA_ARGS__))
#if !TEST_HAS_FEATURE(cxx_rtti) && !defined(__cpp_rtti) \ #if !TEST_HAS_FEATURE(cxx_rtti) && !defined(__cpp_rtti) \