[bug#51747] [PATCH]: gnu: nix: Update to 2.4.

[Zhu Zihao <all_but_last@163.com>]

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Maxime Devos <maximedevos@telenet.be> writes:

> [[PGP Signed Part:Undecided]]
> Zhu Zihao schreef op wo 12-01-2022 om 01:19 [+0800]:
>> +    (name "libcpuid") [...]
>> +    (supported-systems '("x86_64-linux" "i686-linux"))
>
> Given that 'cpuid' is a CPU instruction, I don't think
> this is Linux-specific; presumably it works on the Hurd
> as well.  According to the README, it also supports some BSDs,
> Mac OS and Windows!
>
> Could you change it to
>
> (filter (lambda (t) (or (x86-64-target? t) (or (x86-32-target? t))))
>         %supported-systems)
>
> instead (untested)?
>
> Also, the source code contains a blob
> <https://github.com/anrieff/libcpuid/blob/master/libcpuid/msrdriver.c>,
> could you remove it in an origin snippet?
>
> There might be more blobs, I didn't look at all files.
>
> Greetings,
> Maxime.
>
> [[End of PGP Signed Part]]

Interesting, It looks that these blobs are for Windows system. I don't
care about MS Windows, but blobs are tightly integrated in the source.

The source reports that they're compiled from the source in contrib/MSR
Driver/Kernel. They're PE COFF format, If we want to compile it ourself,
we have to use mingw cross compiler. This increase the complexity of
build script.

AFAIK, nix use libcpuid only in linux context. My idea is replace these
blobs with empty bytes. Maybe leave a note for who want mingw cross build. 

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Zihao

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