Re: Removing #:skip-build? from the crate importer?

[Hartmut Goebel]

Hi,

since rust does not support anything like static or dynamic libraries, 
building (intermediate) crates is useless like a hole in my head. Any 
output on any intermediate crate will just be thrown away.

> Often, when new rust package definitions are submitted at guix-
> patches@, I see #:skip-build? #false.  Apparently it's added by default
> in (guix import cargo), with some exceptions.
The idea behind is to have #:skip-buiild #f for all "top level" crates, 
which are assumed to be programs. Thus, only crates imported recursively 
will get get #:skip-buiild #t. If one imports a single crate, it well 
get #:skip-buiild #f — which is what you experience.

>    However, ‘(guix)Rust
> Crates’ states:
>
>     Care should be taken to ensure the correct version of dependencies
> are used; to this end we try to refrain from skipping the tests or
> using ‘#:skip-build?’ when possible. Of course this is not always
> possible [...]

This text is from 2020-02-17 (written by Effraim) and predates 
269c1db41bd8 (committed 2020-12-02).

While I understand the intention of this, I'm not convinces about it. 
Primary this will lead to a huge wast of time and electrical power - 
just to trash the results. This will not only effect our own build farm, 
but also each user.

Please be aware, that with #:skip-buiild #t, every crate will be build 
again by every other crate using it. So if crate AA is used by B1 and B2 
and C1 depends on B1 and B2, AA will be build 4 times!


> As such, WDYT of removing #:skip-build? #false from (guix import
> crate)?  FWIW, this was added in commit

I would propose the opposite: Keep it and make #t the default.

--
Regards
Hartmut Goebel

| Hartmut Goebel          | h.goebel@crazy-compilers.com               |
| www.crazy-compilers.com | compilers which you thought are impossible |