================
@@ -269,7 +267,10 @@ const char *const Runtimes = R"(
     void __clang_Interpreter_SetValueCopyArr(const T (*Src)[N], void* 
Placement, unsigned long Size) {
       __clang_Interpreter_SetValueCopyArr(Src[0], Placement, Size);
     }
+    extern "C"
----------------
AaronBallman wrote:

This seems a little subtle, but it is correct. One improvement to consider 
would be:
```
#ifdef __cplusplus
#define EXTERN_C extern "C"
#else
#define EXTERN_C extern
#endif
```
and using `EXTERN_C` in the declarations as needed. The current form is subtle 
because it's easy to miss the `extern "C"` in the prior conditional block.

https://github.com/llvm/llvm-project/pull/89811
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