Debug build errors out

[fanyang-mono]

I hit an error when building the CoreCLR in debug mode.

The command that I use to build is

./build.sh clr+libs -c debug

The error message was

  Undefined symbols for architecture arm64:
    "RegSet::rsAllCalleeSavedMask", referenced from:
        RegSet::rsGetModifiedCalleeSavedRegsMask() const in codegencommon.cpp.o
    "RegSet::rsIntCalleeSavedMask", referenced from:
        RegSet::rsGetModifiedOsrIntCalleeSavedRegsMask() const in codegenxarch.cpp.o
        RegSet::rsGetModifiedIntCalleeSavedRegsMask() const in codegenxarch.cpp.o
  ld: symbol(s) not found for architecture arm64
  clang: error: linker command failed with exit code 1 (use -v to see invocation)

This seems to be related to definition of SWIFT_SUPPORT

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[amanasifkhalid]

@fanyang-mono just to check, are you on macOS? And what version of clang are you using?

Edit: Looks like Kunal determined this affects Debug builds only, and has a fix.

[fanyang-mono]

@amanasifkhalid Yes, I was using macOS. This is the clang version on my machine

Apple clang version 15.0.0 (clang-1500.3.9.4)
Target: arm64-apple-darwin23.5.0