Test serialization fixes for macOS, Windows

[lb90]

Add directories in PATH for depends like we do for args

Fixes #4668

[lb90]

Should I add a test?

[bruchar1]

Should I add a test?

Yes, I think having a test would be great. I'm not sure how easy it can be however.

[bruchar1]

If you add the test first, and then the fix, you could ensure that it isn't working before the fix...

[lb90]

Question; how should I address https://github.com/mesonbuild/meson/actions/runs/15275533157/job/42960871671?pr=14649#step:5:16?

[bruchar1]

Question; how should I address https://github.com/mesonbuild/meson/actions/runs/15275533157/job/42960871671?pr=14649#step:5:16?

You can probably do something like: extra_bdeps.extend(t.depends)

[lb90]

Alright, test failure is here: https://github.com/mesonbuild/meson/actions/runs/15276070921/job/42962652326?pr=14649#step:5:320. I'm going to add the fix now :)

EDIT: better wait for the entire CI to finish...

[lb90]

I can easily make the test cross-platform using dlopen + dlsym on UNIX, then it could be moved to common/. Would you be interested in that?

[bruchar1]

I can easily make the test cross-platform using dlopen + dlsym on UNIX, then it could be moved to common/. Would you be interested in that?

If this is easy, yes, I have no objection. I guess it would test that the LD_LIBRARY_PATH is correctly populated, isn't it?

[lb90]

I guess it would test that the LD_LIBRARY_PATH is correctly populated, isn't it?

Yes 👍

Now I wonder if the test will pass on macOS...

EDIT: yeah, it's failing: https://github.com/mesonbuild/meson/actions/runs/15296442821/job/43026602442?pr=14649#step:7:583

[bruchar1]

You can skip the test on Mac by adding

if host_machine.system() == 'darwin'
    error('MESON_SKIP_TEST reason for the skip')
endif

to the build file, and

"expect_skip_on_jobname": ["macos"]

in test.json

[lb90]

Thanks :) The test is working an shows an actual issue on macOS, namely that Meson doesn't set LD_LIBRARY_PATH: https://github.com/mesonbuild/meson/blob/1.8.1/mesonbuild/backend/backends.py#L1293 (cfr #14430). So I'd repurpose this PR to fix both the macOS and Windows issues

[lb90]

Ok, all lights are green! I'm going to add the final commits now: first the test, then the necessary fixes

[bruchar1]

LGTM! Thank you.

[lb90]

Thanks a lot for your help!