Clang + -fms-extensions: __FUNCSIG__ is not a literal

[vrubleg]

__FUNCSIG__ is a literal in MSVC, so you can write something like this:

char Data[] = __FUNCSIG__;

Clang with -fms-extensions specified can't compile it:

error: array initializer must be an initializer list or string literal

[llvmbot]

@llvm/issue-subscribers-clang-frontend

[nico]

dupe of #30933

[vrubleg]

@nico but it seems like it is a different issue.

[nico]

You're right, apologies.

[aeubanks]

https://reviews.llvm.org/D146764

[vrubleg]

Thank you for fixing this.

TBH, it feels like this behavior should be default for all predefined string macros in both Clang and GCC, I don't see any reason why it shouldn't.

Anyway, it is at least available as an option in Clang.