Re: antioxidant update: librsvg builds, and other things (core-updates)

[Maxime Devos <maximedevos@telenet.be>]

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On 28-08-2022 00:04, Liliana Marie Prikler wrote:
> Am Samstag, dem 27.08.2022 um 22:01 +0200 schrieb Maxime Devos:
>> On 27-08-2022 21:54, Liliana Marie Prikler wrote:
>>>> * Due to how regularised the Rust build system is, it's feasible
>>>> to compile tests even when cross-compiling (*), so cross-compiled
>>>> could run the cross-compiled tests on the system they are
>>>> cross-compiling for after the cross-compilation to verify their
>>>> cross-compiled software.
>>> How exactly does this work without emulating the system in
>>> question?
>> It works by not performing any work except compilation -- Guix'
>> responsibility would only be to cross-compile and install the tests
>> (_not_  running them), you are supposed to install the cross-compiled
>> thing (including tests) on the target system and run the tests on the
>> target system.
> This doesn't strike me as a rust-specific setup, though.  In principle,
> you should be able to do the same with a C/C++ program, but most of the
> time "make check" implies both building and running the tests.

The difference between Rust and many C/C++ setups here, is that with 
Rust it's trivial to only compile and install the tests without running 
them (currently, antioxidant-build-system compiles+installs and runs the 
tests in separate phases), whereas in case of C/C++, there usually isn't 
a convenient '"make install-the-tests-without-running-them" target, 
rather building and running the tests is combined in a single "make 
check" as you note.

As I've written previously:

> Due to how regularised the Rust build system is, it's feasible
> to compile tests even when cross-compiling (*)
but that does not appear to be the case for C/C++, as you've noted with 
your comments about "make check" both building and running the tests.

Greetings,
Maxime.

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