[Bug preprocessor/110558] __has_include argument expansion results in unexpected filename

[fw at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110558

--- Comment #3 from Florian Weimer <fw at gcc dot gnu.org> ---
It tries to read "my. header.h" for some reason, even though the
MAKE_INCLUDE_PATH macro produces "my.header.h" in other contexts (not just in
#include directives). I doubt this is related to bug 80753.