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Guard <experimental/coroutine> against older Clang versions. 

Clang started providing -fcoroutines and defining __cpp_coroutines
way before it implemented the __builtin_coro_foo functions. This
means that simply checking if __cpp_coroutines is not a sufficient
way of detecting the actual feature.

This patch implements _LIBCPP_HAS_NO_COROUTINES which implements
a slightly more complex feature check. Specifically it requires
__cpp_coroutines >= 201703L, which only holds for Clang 5.0 built
after 2017/05/24.

llvm-svn: 303956
This commit is contained in:
Eric Fiselier 2017-05-26 01:52:59 +00:00
parent f56a6d84b6
commit eb04c8cae2
2 changed files with 9 additions and 5 deletions
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4
libcxx/include/__config
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@ -1126,6 +1126,10 @@ _LIBCPP_FUNC_VIS extern "C" void __sanitizer_annotate_contiguous_container(
# define _LIBCPP_HAS_NO_IS_AGGREGATE
#endif
#if !defined(__cpp_coroutines) || __cpp_coroutines < 201703L
# define _LIBCPP_HAS_NO_COROUTINES
#endif
#endif // __cplusplus
// Decide whether to use availability macros.

10
libcxx/include/experimental/coroutine
View File

@ -59,7 +59,7 @@ template <class P> struct hash<coroutine_handle<P>>;
#pragma GCC system_header
#endif
#ifndef __cpp_coroutines
#ifdef _LIBCPP_HAS_NO_COROUTINES
# if defined(_LIBCPP_WARNING)
_LIBCPP_WARNING("<experimental/coroutine> cannot be used with this compiler")
# else
@ -67,6 +67,8 @@ template <class P> struct hash<coroutine_handle<P>>;
# endif
#endif
#ifndef _LIBCPP_HAS_NO_COROUTINES
_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_COROUTINES
template <class _Tp, class = void>
@ -88,8 +90,6 @@ struct _LIBCPP_TEMPLATE_VIS coroutine_traits
template <typename _Promise = void>
class _LIBCPP_TEMPLATE_VIS coroutine_handle;
#if defined(__cpp_coroutines)
template <>
class _LIBCPP_TEMPLATE_VIS coroutine_handle<void> {
public:
@ -235,8 +235,6 @@ struct _LIBCPP_TYPE_VIS suspend_always {
void await_resume() const noexcept {}
};
#endif // defined(__cpp_coroutines)
_LIBCPP_END_NAMESPACE_EXPERIMENTAL_COROUTINES
_LIBCPP_BEGIN_NAMESPACE_STD
@ -251,4 +249,6 @@ struct hash<_VSTD_CORO::coroutine_handle<_Tp> > {
_LIBCPP_END_NAMESPACE_STD
#endif // !defined(_LIBCPP_HAS_NO_COROUTINES)
#endif /* _LIBCPP_EXPERIMENTAL_COROUTINE */