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Re: _AC_PROG_CC_C89 enhancement

From: Paul Eggert
Subject: Re: _AC_PROG_CC_C89 enhancement
Date: Thu, 22 Jun 2006 16:52:33 -0700
User-agent: Gnus/5.1008 (Gnus v5.10.8) Emacs/21.4 (gnu/linux)

address@hidden (Larry Jones) writes:

> The IBM C compiler for AIX has a default mode that's almost, but not
> quite, C89.  The differences mostly involve the preprocessor.  In
> particular, macro parameters are substituted inside character constants
> and string literals, which can be quite surprising if you're not
> expecting it.  The current autoconf _AC_PROG_CC_C89 macro does not
> detect this and thus does not add the appropriate flag to CC to fix it. 
> Here's a fix:

Thanks very much; that's a subtle one that (as you noted on
bug-gnulib) breaks real software.  I installed it.

I assume that _AC_PROG_CC_C99 does not need a similar patch because
the default mode already doesn't pass that test.  If that assumption
is incorrect, please let us know.

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