spin run does not show configuration errors from meson setup

[oscarbenjamin]

If I add the following error to meson.build:

error('!!!!!!!!!!!! Wrong Cython version !!!!!!!!!!!!!!!!!!!')

Then if there is no existing build directory spin test would call meson setup and show the error message:

$ rm -r build build-install/
$ spin test
Invoking `build` prior to running tests:
 $ meson setup build --prefix=/usr
The Meson build system
Version: 1.8.2
...

meson.build:32:0: ERROR: Problem encountered: !!!!!!!!!!!! Wrong Cython version !!!!!!!!!!!!!!!!!!!

A full log can be found at /stuff/current/active/python-flint/build/meson-logs/meson-log.txt

Traceback (most recent call last):
  File "/.../.venv/lib/python3.13/site-packages/spin/cmds/meson.py", line 388, in build
    raise RuntimeError(
        "Meson configuration failed; please try `spin build` again with the `--clean` flag."
    )
RuntimeError: Meson configuration failed; please try `spin build` again with the `--clean` flag.

If you suspect this is a bug in `spin`, please file a report at:

  https://github.com/scientific-python/spin

including the above traceback and the following information:

  spin: 0.18, package: python-flint

Aborting.

If I instead do spin run then the configuration error from meson.build is not displayed:

$ rm -r build build-install/
$ spin run -- pytest 
 $ meson setup build --prefix=/usr

Traceback (most recent call last):
  File "/.../.venv/lib/python3.13/site-packages/spin/cmds/meson.py", line 388, in build
    raise RuntimeError(
        "Meson configuration failed; please try `spin build` again with the `--clean` flag."
    )
RuntimeError: Meson configuration failed; please try `spin build` again with the `--clean` flag.

If you suspect this is a bug in `spin`, please file a report at:

  https://github.com/scientific-python/spin

including the above traceback and the following information:

  spin: 0.18, package: python-flint

Aborting.

It would be better if this also showed the meson setup output and especially the useful error message "Wrong Cython version".

[oscarbenjamin]

It looks deliberate that spin run does a quiet build:

spin/spin/cmds/meson.py

Lines 886 to 887 in 8da1266

	# Also ask build to be quiet
	ctx.invoke(build_cmd, build_dir=build_dir, quiet=True)

I think maybe an exception should be made for the case where the build fails though. In that case the build output should be shown. Maybe it can be collected and displayed at the end based on the return code.