[flang] [clang] [lldb] [lld] [clang-tools-extra] [mlir] [libc] [compiler-rt] [llvm] [libcxx] [libc++][format] P2637R3: Member `visit` (`std::basic_format_arg`) (PR #76449)

[Hristo Hristov via cfe-commits]

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@@ -144,7 +144,8 @@ _LIBCPP_HIDE_FROM_ABI decltype(auto) __visit_format_arg(_Visitor&& __vis, basic_
   __libcpp_unreachable();
 }
 
-#  if _LIBCPP_STD_VER >= 26
+#  if _LIBCPP_STD_VER >= 26 && (!defined(_LIBCPP_COMPILER_CLANG_BASED) || _LIBCPP_CLANG_VER >= 1800)
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H-G-Hristov wrote:

https://clang.llvm.org/docs/ReleaseNotes.html

> Implemented P0847R7: Deducing this. Some related core issues were also implemented (CWG2553, CWG2554, CWG2653, CWG2687). Because the support for this feature is still experimental, the feature test macro __cpp_explicit_this_parameter was not set in this version.

I'll revert the change.

https://github.com/llvm/llvm-project/pull/76449