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Re: Bootstrapping glibc vs. dependency on system headers

From: Roland McGrath
Subject: Re: Bootstrapping glibc vs. dependency on system headers
Date: Wed, 23 Jan 2013 14:34:09 -0800 (PST)

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.


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