Clang does not define `__WCHAR_MIN__` predefined macro

[alexrp]

This breaks riscv(32,64)-netbsd because its headers expect to be able to define WCHAR_MIN in terms of __WCHAR_MIN__:

https://github.com/NetBSD/src/blob/22482b30a24f6cabb88766b409f76195ae725813/sys/arch/riscv/include/wchar_limits.h#L1-L3
https://github.com/NetBSD/src/blob/22482b30a24f6cabb88766b409f76195ae725813/sys/sys/common_wchar_limits.h#L41-L43

cc @brad0 you might be interested in this since you did the initial riscv(32,64)-netbsd enablement in Clang?

[llvmorg-github-actions]

@llvm/issue-subscribers-clang-frontend

Author: Alex Rønne Petersen (alexrp)

Details

This breaks `riscv(32,64)-netbsd` because its headers expect to be able to define `WCHAR_MIN` in terms of `__WCHAR_MIN__`:

https://github.com/NetBSD/src/blob/22482b30a24f6cabb88766b409f76195ae725813/sys/arch/riscv/include/wchar_limits.h#L1-L3
https://github.com/NetBSD/src/blob/22482b30a24f6cabb88766b409f76195ae725813/sys/sys/common_wchar_limits.h#L41-L43

cc @brad0 you might be interested in this since you did the initial riscv(32,64)-netbsd enablement in Clang?