================
@@ -152,11 +152,6 @@ _LIBCPP_HARDENING_MODE_DEBUG
 #  define _LIBCPP_TOSTRING2(x) #x
 #  define _LIBCPP_TOSTRING(x) _LIBCPP_TOSTRING2(x)
 
-// NOLINTNEXTLINE(libcpp-cpp-version-check)
-#  if __cplusplus < 201103L
-#    define _LIBCPP_CXX03_LANG
-#  endif
----------------
ldionne wrote:

In the current state of this patch, the "intersection" between the 03 headers 
and the normal headers is basically the definition of `_LIBCPP_CXX03_LANG`, but 
we're including all of `__configuration/language.h` for that. I think that we 
should strive to make that intersection empty, because anything in that 
intersection can cause incompatibilities and confusion.

Since `_LIBCPP_CXX03_LANG` is so simple, I would instead just check the value 
of `__cplusplus` directly at the top-level, and not share anything between the 
03 headers and the normal headers.

Note that `__config_site` is also something that technically falls inside that 
intersection and that's tricky to handle, we can discuss that separately.

https://github.com/llvm/llvm-project/pull/109002
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