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Re: complex configure tests involving multiple files and possibly libtoo

From: Eric Blake
Subject: Re: complex configure tests involving multiple files and possibly libtool/automake
Date: Thu, 26 Jan 2017 15:44:40 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0

On 01/26/2017 03:42 PM, Eric Blake wrote:
> I'm not directly aware of a way to do it, but you CAN use AC_TRY_COMPILE
> and then in the 'action-if-true' branch you can copy conftest.o to a
> safe location, then try and figure out how to make the subsequent
> AC_TRY_LINK refer back to the .o file that you squirreled away.  You'll
> have to experiment if you can't find an actual example, and if you get
> it working, be sure to post back to the list, but I hope that gives you
> some hints of things to try.

Correction - use the modern macros instead. In fact, AC_COMPILE_IFELSE
already documents that you can access conftest.$OBJEXT in the
action-if-true block, so it is a supported interface:

Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library

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