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Re: Detecting Autoconf and Including Additional M4 Files
From: |
Eric Blake |
Subject: |
Re: Detecting Autoconf and Including Additional M4 Files |
Date: |
Mon, 24 Sep 2007 06:18:10 -0600 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.6) Gecko/20070728 Thunderbird/2.0.0.6 Mnenhy/0.7.5.666 |
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According to Christopher Key on 9/24/2007 5:15 AM:
> Hence, what I'd like to do is to be able to
> detect whether autoconf has been used, and act appropriately
Why not just a simple AC_DEFINE using a macro name of your choice, that
you know will not be injected into your compilation if you didn't run
autoconf?
>
> Secondly, I'm also wanting to detect whether there an arithmetic right
> shift available. I've found a test that does this, and have put it in
> package/m4/asr.m4. What I'm wondering is how to ensure that this file
> is included. The only way I've found to achieve this is to add
> 'ACLOCAL_AMFLAGS = -I m4' to package/Makefile.am, but this doesn't seem
> quite right.
Actually, it is the documented way to do things if you use both autoconf
and automake.
> I've seen adding 'AC_SUBST(ACLOCAL_AMFLAGS, "-I m4")' to
> configure.ac suggested online, but this didn;t seem to do the trick.
Nor is that approach recommended (not to mention it is underquoted).
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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