diff options
| author | Jonathan Wakely <jwakely@redhat.com> | 2019-10-16 10:26:05 +0000 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2019-10-16 10:26:05 +0000 |
| commit | fa577314c501ca5a07a6fd3a6f8a41ba1c689585 (patch) | |
| tree | cb601b79c1cdca52fd0dfccc8addf287e5b99c97 /libstdc++-v3/include/bits/c++config | |
| parent | b74821597c67e73efc9e305a1c1b879f6e221613 (diff) | |
Only use GCC-specific __is_same_as built-in conditionally
Clang doesn't support __is_same_as but provides __is_same instead.
Restore the original implementation (pre r276891) when neither of those
built-ins is available.
* include/bits/c++config (_GLIBCXX_BUILTIN_IS_SAME_AS): Define to
one of __is_same_as or __is_same when available.
* include/std/concepts (__detail::__same_as): Use std::is_same_v.
* include/std/type_traits (is_same) [_GLIBCXX_BUILTIN_IS_SAME_AS]:
Use new macro instead of __is_same_as.
(is_same) [!_GLIBCXX_BUILTIN_IS_SAME_AS]: Restore partial
specialization.
(is_same_v) [_GLIBCXX_BUILTIN_IS_SAME_AS]: Use new macro.
(is_same_v) [!_GLIBCXX_BUILTIN_IS_SAME_AS]: Use std::is_same.
git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@277058 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libstdc++-v3/include/bits/c++config')
| -rw-r--r-- | libstdc++-v3/include/bits/c++config | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config index c8e099aaadd..32db60f39e5 100644 --- a/libstdc++-v3/include/bits/c++config +++ b/libstdc++-v3/include/bits/c++config @@ -633,6 +633,7 @@ namespace std # define _GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP 1 # define _GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE 1 # define _GLIBCXX_HAVE_BUILTIN_LAUNDER 1 +# define _GLIBCXX_BUILTIN_IS_SAME_AS(T, U) __is_same_as(T, U) # if __GNUC__ >= 9 # define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1 # endif @@ -650,6 +651,9 @@ namespace std # if __has_builtin(__builtin_is_constant_evaluated) # define _GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED 1 # endif +# if ! __is_identifier(__is_same) +# define _GLIBCXX_BUILTIN_IS_SAME_AS(T, U) __is_same(T, U) +# endif #endif // GCC // PSTL configuration |