New clang-cl warnings

[Gisle Vanem]

I'm not sure exactly when or how these new warnings from
clang-cl happened (a lot of them):

  f:/ProgramFiler-x86/WindowsKits/Include/10.0.15063.0/ucrt/stdlib.h(78,5):
    warning: macro expansion producing 'defined' has undefined behavior
    [-Wexpansion-to-defined]
  #if _CRT_INTERNAL_NONSTDC_NAMES
      ^
  f:\ProgramFiler-x86\WindowsKits\Include\10.0.15063.0\ucrt\corecrt.h(288,11):  
note: expanded from macro
        '_CRT_INTERNAL_NONSTDC_NAMES'
          ( defined _CRT_DECLARE_NONSTDC_NAMES && _CRT_DECLARE_NONSTDC_NAMES) 
|| \
            ^

Really, why? This happens in any program using Gnulib. The above is from Wget.

I guess it has something to do with (the lack of?) one of the '_CRT_x'
defines MS uses. I compile with '-Wno-expansion-to-defined' to ignore this
warning. Any idea?

--
--gv