ptrauth module include issue for Swift 6.1 release

[Kyle-Ye]

On Swift 6.1 release, the LLVM dependency has included the following commit.

swiftlang/llvm-project@0481f04

And it added ptrauth.h header to clang's modulemap file.

module ptrauth {
  header "ptrauth.h"
  export *
}

And on swift-corelibs-foundation repo, we have the following statements between a CF_EXTERN_C_BEGIN and CF_EXTERN_C_END block.

#if __has_include(<ptrauth.h>)
#include <ptrauth.h>
#endif

It will end up causing include issue for the CoreFoundation on Linux platform.

/usr/lib/swift/CoreFoundation/CFBase.h:683:1: error: import of C++ module 'ptrauth' appears within extern "C" language linkage specification [-Wmodule-import-in-extern-c]

The fix is move such include statements out of CF_EXTERN_C_BEGIN and CF_EXTERN_C_END block.

[Kyle-Ye]

Workaround: Comment this include line or move it out of the extern scope on your local Swift SDK on Linux.

https://gist.github.com/Kyle-Ye/4658b5651f93e198f2cef80c00e5a1bf