On Wed, 2024-07-24 at 18:14 -0400, Eli Schwartz wrote:
> On 7/24/24 6:07 PM, James Le Cuirot wrote:
> > Rust packages have a tendency to rebuild parts during test and install.
> > It is not clear whether this can be addressed. We were therefore relying
> > on some environment variables set during the compile phase for
> > cross-compiling to work in the later phases. This is not ideal,
> > especially if you need to build for multiple targets.
> 
> 
> Oof, yeah, as I mentioned on Monday in -dev, I have a package that
> actually produces meaningfully different programs if you rebuild it
> during test.
> 
> dev-util/ruff will, when built with FEATURES=test, not show color when
> you run it. Don't know why, feel a bit too freaked out about rebuilding
> for tests *at all* to even think about fixing this in a "src_test
> compatible way".
> 
> So I wonder if maybe we can somehow switch to e.g. doing the test phase
> in a different directory such that it doesn't modify the artifacts we
> actually want to install.

It can happen due to files or environment variables changing. It sounds like
the tests inadvertently cause that in this case. You could copy the
$(cargo_target_dir) to $(cargo_target_dir)-test and then set CARGO_TARGET_DIR
to the latter before running the tests.