[bug#48463] gnu: Add j.

[elaexuotee]

Thanks for staying on top of this patch review.

Liliana Marie Prikler <liliana.prikler@gmail.com> wrote:
> Hi,
> 
> Note, that the current version still ignores commit.  I've attached a
> proof of concept patch, which fixes that, plus some other minor things,
> but it now uses a pair for version.  Also it's untested, so treat with
> care.

Oh! I see. You're wanting the version string to have optional REVISION and
COMMIT parts, like `git-version'. That makes a lot of sense.

There was a small issue with `jversion->string' in your patch, which produces
MAJOR-REVISION-COMMIT if no MINOR value is provided. I want to make sure that
users can always have specifications like "jsoftware-j@MAJOR" in their profile
manifest, but guix doesn't treat hyphen as a version separator.

I just changed the logic to always keep a dot after MAJOR, and then use hyphens
after that.

> > Good idea. Upstream's build scripts condition a *lot* of behaviour on
> > the j64avx environment variable, so it might not be straightforward,
> > but I will put this on the to-do list of future improvements.
> > 
> > (Note, the code block quoted here got much simplified in the current
> > patch.)
> Reading /proc/cpuinfo is not nice.  Please use (guix cpu), which also
> provides you the flags that you need.

Oh nice. A new, shiny module! This is exactly what I was looking for when
originally writing the script. Updated.

0001-gnu-Add-j.patch
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