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Re: detection of gcc version
From: |
Eric Blake |
Subject: |
Re: detection of gcc version |
Date: |
Tue, 13 Jan 2009 06:15:57 -0700 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.19) Gecko/20081209 Thunderbird/2.0.0.19 Mnenhy/0.7.5.666 |
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According to Vincent Torri on 1/10/2009 11:09 PM:
>
> Hey,
>
> I would like to detect the major version of gcc in configure.ac. A guy
> told me to use sed like that:
>
> GCC_MAJOR_VERSION=`$CC -dumpversion | sed "s/\..*//"`
>
> Is there a better way to do that with autoconf macros ?
What about using preprocessor macros and AC_COMPILE_IFELSE? For example,
#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 2)
int dummy;
#else
not gcc, or gcc is too old
#endif
But in general, version number checks tend to be counterproductive; the
autoconf philosophy favors feature checks over version number checks.
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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