[FFmpeg-cvslog] configure: slightly more robust looking check for math functions.

[Clément Bœsch]

On Tue, Sep 13, 2011 at 05:58:15PM +0200, Michael Niedermayer wrote:
> ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue Sep 13 17:29:49 2011 +0200| [9331a2ee41d13d04e2eed077f1f934a62288ab01] | committer: Michael Niedermayer
> 
> configure: slightly more robust looking check for math functions.
> I dont know on which system the prior check failed but an advanced
> linker on some platform might have optimized func() out as unreachable.
> 
> Patch taken from http://floss.freebox.fr
> Author: unknown
> 

The author is Clément Vasseur (cvasseur, from freebox.fr). The issue came
out using the gnu toolchain linker with the options -ffunction-sections
-fdata-sections -Wl,--gc-sections, used in order to have a small build.
Those options made the linker removing the unused function.

Thanks to him for those details.

Maybe we should add a git note or something?

-- 
Clément B.
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