libstdc++: Make <mdspan> compatible with clang.

The submdspan feature broke compatibility with clang, due to a missing
'::template type'.

libstdc++-v3/ChangeLog:

	* include/std/mdspan (submdspan): Fix missing '::template'.

Reviewed-by: Jonathan Wakely <jwakely@redhat.com>
Signed-off-by: Luc Grosheintz <luc.grosheintz@gmail.com>

diff --git a/libstdc++-v3/include/std/mdspan b/libstdc++-v3/include/std/mdspan
index dc0aa4f9584fd217a5494368a997d00ac236a25c..cedf597d3c2693b78b59c29adcf6fc0071906384 100644 (file)
--- a/libstdc++-v3/include/std/mdspan
+++ b/libstdc++-v3/include/std/mdspan
@@ -3376,7 +3376,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
   template<typename _ElementType, typename _Extents, typename _Layout,
           typename _Accessor, typename... _RawSlices>
     requires (sizeof...(_RawSlices) == _Extents::rank()
-       && __mdspan::__sliceable_mapping<typename _Layout::mapping<_Extents>,
+       && __mdspan::__sliceable_mapping<typename _Layout::template mapping<_Extents>,
                                         __mdspan::__full_extent_t<_RawSlices>...>)
     constexpr auto
     submdspan(