[Pkg-phototools-devel] Bug#864012: depending on sse4.2-support would be a bad idea

Adam Borowski kilobyte at angband.pl
Thu Oct 5 01:59:31 UTC 2017

> The sse4.2-support package can help to prevent user from installing
> lepton on not supported platform. Not sure if that is enough to solve
> this issue.

I see that the sse4.1 requirement is only a flaw of the build system, thus
it should be possible to compile for the arch's baseline.  The package has
legitimate use cases on older computers, thus there's no reason to
hard-require CPU extensions.

If there's a drastic speed difference with and without vectorization, it's
possible to build two variants, either in a single executable (selected at
runtime) or separately.  When built as a single executable, GCC even has
nice support for auto-selecting appropriate variant.

⢀⣴⠾⠻⢶⣦⠀ We domesticated dogs 36000 years ago; together we chased
⣾⠁⢰⠒⠀⣿⡁ animals, hung out and licked or scratched our private parts.
⢿⡄⠘⠷⠚⠋⠀ Cats domesticated us 9500 years ago, and immediately we got
⠈⠳⣄⠀⠀⠀⠀ agriculture, towns then cities.     -- whitroth on /.

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