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Re: complex configure tests involving multiple files and possibly libtoo
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From: |
Eric Blake |
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Subject: |
Re: complex configure tests involving multiple files and possibly libtool/automake |
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Date: |
Thu, 26 Jan 2017 15:44:40 -0600 |
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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:
https://www.gnu.org/software/autoconf/manual/autoconf.html#Running-the-Compiler
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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