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Re[2]: double underscores in autoconf-defined symbol names

From: Vadim Zeitlin
Subject: Re[2]: double underscores in autoconf-defined symbol names
Date: Wed, 18 Jan 2006 15:43:18 +0100

On Tue, 10 Jan 2006 12:42:29 -0800 Paul Eggert <address@hidden> wrote:

PE> Vadim Zeitlin <address@hidden> writes:
PE> > fact it's detected by an automatic precommit check in the project I'm
PE> > working on
PE> Well, to solve your immediate problem, it ought to be easy enough to
PE> exempt HAVE__* names from the precommit check.  The precommit check
PE> ought to be your servant, not your master.

 Yes, finally we're going to just work around this issue for now. So the
discussion is a bit theoretical but still:

PE> >  Maybe the most logical would be to have AC_CXX_CHECK_FUNCS then?
PE> Can you use AC_LANG(C++) followed by AC_CHECK_FUNCS?

 I proposed AC_CXX_CHECK_FUNCS to avoid breaking compatibility. I.e. if
some existing code used AC_CHECK_FUNCS(_foo) before (possibly after
AC_LANG(C++)), then changing it to define HAVE_UNDERSCORE_FOO instead of
HAVE__FOO would almost surely break it. While AC_CXX_CHECK_FUNCS wouldn't
have had this problem.

 But it's true that logically AC_CHECK_FUNCS() shouldn't use identifiers
with 2 underscores if the current language is C++.


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