[clang] [Clang] [C23] Implement N2653: u8 strings are char8_t[] (PR #97208)

[via cfe-commits]

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@@ -1165,6 +1165,8 @@ static void InitializePredefinedMacros(const TargetInfo 
&TI,
   DefineType("__WCHAR_TYPE__", TI.getWCharType(), Builder);
   DefineType("__WINT_TYPE__", TI.getWIntType(), Builder);
   DefineTypeSizeAndWidth("__SIG_ATOMIC", TI.getSigAtomicType(), TI, Builder);
+  if (LangOpts.Char8 || LangOpts.C23)
+    DefineType("__CHAR8_TYPE__", TI.UnsignedChar, Builder);
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cor3ntin wrote:

I'm certainly concerned with the impact of that in C++. It should not be 
defined in C++ (ie, char9_t is not unsigned char in C++)

https://github.com/llvm/llvm-project/pull/97208
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