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

[Hristo Hristov via lldb-commits]

================
@@ -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)
----------------
H-G-Hristov wrote:

Maybe something like:

```c++
#  if _LIBCPP_STD_VER >= 26 && (defined(__cpp_explicit_this_parameter) || 
!defined(_LIBCPP_COMPILER_CLANG_BASED) || _LIBCPP_CLANG_VER >= 1800)
...
#endif
```
or 

```c++
#if defined(__cpp_explicit_this_parameter) || 
!defined(_LIBCPP_COMPILER_CLANG_BASED) || _LIBCPP_CLANG_VER >= 1800
#define _LIBCPP_EXPLICIT_THIS_PARAMETER
#endif
```

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