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Re: Detect Autoconf run in preprocessor?
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From: |
Eric Blake |
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Subject: |
Re: Detect Autoconf run in preprocessor? |
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Date: |
Fri, 15 Jul 2016 12:56:19 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 07/15/2016 12:47 PM, Jeffrey Walton wrote:
> On Fri, Jul 15, 2016 at 2:35 PM, Bob Friesenhahn
> <address@hidden> wrote:
>> On Fri, 15 Jul 2016, Jeffrey Walton wrote:
>>>
>>>
>>> Is there a preprocessor macro defined by Autotools to detect when
>>> software is being configured by the tool? My apologies for asking; I
>>> cannot simply run `g++ -dM -E - </dev/null` because it will lack
>>> Autoconf specific defines.
>>
>>
>> Everything that Autoconf defines should be visible in the generated
>> config.log file. The source for each test case is included.
>
> Thanks. I'll have to ask the person for it.
>
> But getting back to Autoconf defines, is there a preprocessor define
> that Autoconf uses to identify itself?
Autoconf does not define anything specific. You can write an early
AC_DEFINE in your configure.ac to trigger a specific witness used in all
subsequent probes, but that's a per-package solution.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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