From 6b78e97a0cbc60dea937f3bf67c5d47033cf4731 Mon Sep 17 00:00:00 2001
From: Luc Grosheintz <luc.grosheintz@gmail.com>
Date: Fri, 12 Dec 2025 12:28:01 +0100
Subject: [PATCH] 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>
---
 libstdc++-v3/include/std/mdspan | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/std/mdspan b/libstdc++-v3/include/std/mdspan
index dc0aa4f9584..cedf597d3c2 100644
--- 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(
-- 
2.47.3