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Re: Bootstrapping glibc vs. dependency on system headers
As to the general case, I think float.h is probably the best choice
and stdarg.h probably just as good. It's been a very long time since
anything but GCC itself installed headers by those names.
For libc, I think always using $CC -E is fine. You don't need to bother
with the MSG_CHECKING and CACHE_VAL boilerplate. (Frankly I don't think it
really matters to respect a user override of CPP, but ignoring one would be
a somewhat more extreme departure from the norm.)
It's best if comments refer to a URL in a bug database (libc's bugzilla or
another one, whatever) with details filed there rather than pointing to a
mailing list thread. If you do use URLs to mailing list archives, they
must be to the canonical archive (http://sourceware.org/ml/libc-alpha/...)
rather than to some third-party site.