Re: FYI, 2.73 slower than 2.72

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On 2026-03-19 07:41, Akim Demaille wrote:
> I believe the answer is inhttps://lists.gnu.org/archive/html/autoconf-patches/2002-10/msg00072.html.

Thanks, that explains things. Via the attached patch I attempted to go 
back to the old way of doing things (but outputting confdefs.h info in a 
different way). However, this didn't affect overall performance 
significantly for me on my Fedora 43 system. And although the patch does 
avoid cat's unnecessary copying of confdefs.h, it causes a bit more work 
for the C preprocessor and it's not clear that this is an overall win.

Also, although this sort of patch may be a win on platforms where 
copy_file_range is unhappily inefficient, this sort of performance 
experimentation should probably not be done just before an Autoconf release.


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