git: 6a42a876ddcf - stable/13 - libcxx atomic_ref.h: add typename keyword for difference_type declarations, otherwise older clang versions cannot compile this header.

The branch stable/13 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=6a42a876ddcf7e86fd756e85d5d0fcae53921007

commit 6a42a876ddcf7e86fd756e85d5d0fcae53921007
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2024-08-05 20:07:28 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2024-12-01 12:32:38 +0000

    libcxx atomic_ref.h: add typename keyword for difference_type
    declarations, otherwise older clang versions cannot compile this header.
    
    PR:             280562
    MFC after:      1 month
    
    (cherry picked from commit 81e300df5e654eee3835ec2c6a2ae34cf317df72)
---
 contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h b/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h
index 156f1961151c..f5ab6ffc9e77 100644
--- a/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h
+++ b/contrib/llvm-project/libcxx/include/__atomic/atomic_ref.h
@@ -241,7 +241,7 @@ template <class _Tp>
 struct atomic_ref<_Tp> : public __atomic_ref_base<_Tp> {
   using __base = __atomic_ref_base<_Tp>;
 
-  using difference_type = __base::value_type;
+  using difference_type = typename __base::value_type;
 
   _LIBCPP_HIDE_FROM_ABI explicit atomic_ref(_Tp& __obj) : __base(__obj) {
     _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(
@@ -287,7 +287,7 @@ template <class _Tp>
 struct atomic_ref<_Tp> : public __atomic_ref_base<_Tp> {
   using __base = __atomic_ref_base<_Tp>;
 
-  using difference_type = __base::value_type;
+  using difference_type = typename __base::value_type;
 
   _LIBCPP_HIDE_FROM_ABI explicit atomic_ref(_Tp& __obj) : __base(__obj) {
     _LIBCPP_ASSERT_ARGUMENT_WITHIN_DOMAIN(