[Bug libstdc++/61532] [4.9/4.10 regression] make_signed and make_unsigned wchar_t have started failing in the libstdc++ testsuite.

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61532

--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
Writing "signed wchar_t" doesn't seem legal to me, and clang and intel warn or
reject such code.