[FFmpeg-devel] [PATCH 3/3] configure: speedup x2-x8

[avih]

For overview see:
http://ffmpeg.org/pipermail/ffmpeg-devel/2018-August/233665.html

Attached is patch 3/3 which was at "main.patch" of that message.

After the previous speedups, configure spent 20-60% of its runtime
at check_deps(). It's particularly slow with bash. After some local
optimizations - mainly avoid pushvar/popvar and abort early in one
notable case (empty deps), it's now x4-x25 faster.

After this patch, pushvar() and popvar() are not used but
I was hesitant to remove them (nice to have). If you think it should
be removed, the patch "opt2-remove-pushvar.patch" removes them.
 

    On Saturday, August 25, 2018 7:55 PM, Timo Rothenpieler <timo at rothenpieler.org> wrote:
 

 Please use git send-email to send your patches, or at least send each 
patch, created by git format-patch, as individual attachment. Your files 
seem to contain multiple patches one after another, which makes them 
very hard to follow.

But nice work! Let's hope this does not cause any regressions.
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