Re: F39 proposal: RPM 4.19 (System-Wide Change proposal)

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Chris Adams <linux@xxxxxxxxxxx> writes:

> Once upon a time, Zbigniew Jędrzejewski-Szmek <zbyszek@xxxxxxxxx> said:
>> On Tue, Apr 04, 2023 at 11:17:50AM +0200, Jakub Jelinek wrote:
>> > Why a subrpm?  Should be possible to just arrange for one src.rpm to
>> > build the library twice and install the x86-64-v3 into
>> > /usr/lib64/glibc-hwcaps/x86-64-v3/
>> > Perhaps come with some macro to simplify that for packagers.
>> 
>> If we start compiling libaries twice, it'd double the package sizes
>> (or actually more than double, since in the benchmarks the code size
>> with -v3 is also increased slightly). I assume people would want to
>> get the optimized form split out to a subpackage so people who don't
>> use this, don't pay the price. If we use the new "dynamic subpackages"
>> feature of RPM, and some smart macros, this could even not be a big
>> packaging burden.
>
> Yeah, it'd be back to the i386/i586/i686 days... which was a bit of a
> PITA sometimes.  But cramming multiple architectures of core libraries
> into a single RPM would be bad for disk space, image size, downloads,
> etc.
>
> But something that didn't exist in the i386/i686 days is containers -
> whether base images like for podman or full things like Flatpaks.
> Before going too deep into multi-level architectures, that should be
> taken into account.

Afaik at least container runtimes do not support really support x86_64
subarchitectures: https://github.com/containers/podman/discussions/15256


Cheers,

Dan
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