[clang] [clang][bytecode] Implement __builtin_{wcscmp, wcsncmp} (PR #132723)

[Rainer Orth via cfe-commits]

rorth wrote:

I fear it won't, unfortunately: the Solaris builders (and no doubt others) are configured to support only the native target (`sparc*` in the current case), not necessarily x86.

https://github.com/llvm/llvm-project/pull/132723