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To: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
Cc: "Alexandre Oliva" <oliva AT lsd DOT ic DOT unicamp DOT br>,
        <cygwin-apps AT sources DOT redhat DOT com>, <autoconf AT gnu DOT org>
Subject: Re: updated win32 macro
References: <035401c0ac91$3ba21fd0$0200a8c0 AT lifelesswks>
	<022001c0accf$29b724d0$0200a8c0 AT lifelesswks>
	<orelvz60mr DOT fsf AT guarana DOT lsd DOT ic DOT unicamp DOT br>
	<007f01c0ad2e$f3dc5d20$0200a8c0 AT lifelesswks>
	<00a301c0ad32$57ad0220$0200a8c0 AT lifelesswks>
From: Akim Demaille <akim AT epita DOT fr>
Date: 15 Mar 2001 10:49:01 +0100
In-Reply-To: <00a301c0ad32$57ad0220$0200a8c0@lifelesswks>
Message-ID: <mv4elvz5pma.fsf@nostromo.lrde.epita.fr>
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>>>>> "Robert" == Robert Collins <robert DOT collins AT itdomain DOT com DOT au> writes:

Robert> It looks like the cc result is not used from cache - so I
Robert> don't think this test should allow caching. Also I have a
Robert> question on the caching: I need to cache _the change needed to
Robert> CC_... Is that temporary variable automatically cached?

If you ac_cv_ it, yes.  But never display a cache variable to the
user.

You macro, indeed, is fragile to the changes of LANG.  I'm not sure

AC_PROG_CC_WIN32
AC_LANG(C++)
AC_LANG(C)
echo $ac_compile

will display what you hope it would.  And actually, now that coffee
suddenly breaks my mind free, I just understood you meant to do here:

ac_cc_win32=yes
ac_compile="$ac_compile -mwin32"
ac_link="$ac_link -mwin32"
CC="$CC -mwin32"

this is `wrong'.  ac_compile and friends are not evaluated at their
definition, but at their uses.  So you need not (and must not) change
them at all.  Changing CC is a bad idea.  And BTW, my suggestion
behind the C++ stuff was that, IMHO, you should not set CC, or maybe
at least provide the user with a means to get the switch, say the
variable $WIN32CFLAGS.

AC_LANG_COMPILER_MWIN32([YES-WIN32], [NOT-WIN32])

I would be able to write

AC_LANG_COMPILER_MWIN32([CC="$CC $WIN32CFLAGS])
CXX="$CXX $WIN32CFLAGS"