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Re: how to detect gcc version in configure.ac
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From: |
Eric Blake |
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Subject: |
Re: how to detect gcc version in configure.ac |
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Date: |
Fri, 04 Jul 2014 06:59:22 -0600 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0 |
On 07/03/2014 11:38 PM, Minxuan Zhuang wrote:
> a project needs to satisfy both gcc 4.1.2 and gcc 4.7.3, but some options
> in the latter one(like -Wno-narrowing and Wno-unused-result) cannot be used
> in the former one. So I need to test the cutrrent gcc version and decide
> what can of option can be assigned to CFLAGS, sth like:
No. You _don't_ want to test the compiler version. Instead, you want
to test the compiler feature (as features can be backported across
versions).
>
> if gcc version == 4.1.2
> CFLAGS＝．．．．
> else
> CFLAGS =.....
>
> how can I implement it in configure.ac?
Look at how gnulib does it:
http://git.savannah.gnu.org/cgit/gnulib.git/tree/m4/manywarnings.m4
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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