uv fails to build uWSGI when run from inside virtual env

[Tonius]

When using pip, installing uWSGI works:

(.env) $ pip install uWSGI==2.0.24

  Collecting uWSGI==2.0.24
    Downloading uwsgi-2.0.24.tar.gz (810 kB)
      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 810.6/810.6 kB 7.5 MB/s eta 0:00:00
    Installing build dependencies ... done
    Getting requirements to build wheel ... done
    Preparing metadata (pyproject.toml) ... done
  Building wheels for collected packages: uWSGI
    Building wheel for uWSGI (pyproject.toml) ... done
    Created wheel for uWSGI: filename=uWSGI-2.0.24-cp311-cp311-linux_x86_64.whl size=595370 sha256=ce6d03e32afc79de4a29f1dea85ed70e17abca0ca133d982b92797fbf180c119
    Stored in directory: /home/tonius/.cache/pip/wheels/e0/d0/b6/701d5fb26ab6f65edf139106f9f890a43b7b2cf7979d5171a6
  Successfully built uWSGI
  Installing collected packages: uWSGI
  Successfully installed uWSGI-2.0.24

It also works when using a 'regular' install of uv, for example when installed using pipx:

(.env) $ ~/.local/bin/uv pip install uWSGI==2.0.24

  Resolved 1 package in 988ms
     Built uwsgi==2.0.24                                                                                                                                                                                                     
  Downloaded 1 package in 10.44s
  Installed 1 package in 0ms
   + uwsgi==2.0.24

But when uv is installed inside the virtual env and run from there, it fails with the following error:

(.env) $ python -m uv pip install uWSGI==2.0.24

  Resolved 1 package in 921ms
  error: Failed to download distributions
    Caused by: Failed to fetch wheel: uwsgi==2.0.24
    Caused by: Failed to build: uwsgi==2.0.24
    Caused by: Build backend failed to build wheel through `build_wheel()`:
  --- stdout:
  running bdist_wheel
  running build
  running build_py
  creating build
  creating build/lib
  copying uwsgidecorators.py -> build/lib
  installing to build/bdist.linux-x86_64/wheel
  running install
  using profile: buildconf/default.ini
  detected include path: ['/usr/include', '/usr/local/include']
  --- stderr:
  /tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/_distutils/dist.py:265: UserWarning: Unknown distribution option: 'descriptions'
    warnings.warn(msg)
  Traceback (most recent call last):
    File "/home/tonius/.cache/uv/built-wheels-v0/pypi/uwsgi/2.0.24/1qJiuyeK8BlA1eq0B7wMy/uwsgi-2.0.24.tar.gz/uwsgiconfig.py", line 754, in __init__
      gcc_version_components = gcc_version.split('.')
                              ^^^^^^^^^^^^^^^^^
  AttributeError: 'NoneType' object has no attribute 'split'

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "<string>", line 6, in <module>
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/build_meta.py", line 404, in build_wheel
      return self._build_with_temp_dir(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/build_meta.py", line 389, in _build_with_temp_dir
      self.run_setup()
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/build_meta.py", line 480, in run_setup
      super().run_setup(setup_script=setup_script)
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/build_meta.py", line 311, in run_setup
      exec(code, locals())
    File "<string>", line 117, in <module>
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/__init__.py", line 103, in setup
      return distutils.core.setup(**attrs)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 185, in setup
      return run_commands(dist)
            ^^^^^^^^^^^^^^^^^^
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/_distutils/core.py", line 201, in run_commands
      dist.run_commands()
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 969, in run_commands
      self.run_command(cmd)
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/dist.py", line 963, in run_command
      super().run_command(command)
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
      cmd_obj.run()
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/wheel/bdist_wheel.py", line 403, in run
      self.run_command("install")
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/_distutils/cmd.py", line 318, in run_command
      self.distribution.run_command(command)
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/dist.py", line 963, in run_command
      super().run_command(command)
    File "/tmp/.tmpeseF7y/.venv/lib/python3.11/site-packages/setuptools/_distutils/dist.py", line 988, in run_command
      cmd_obj.run()
    File "<string>", line 77, in run
    File "/home/tonius/.cache/uv/built-wheels-v0/pypi/uwsgi/2.0.24/1qJiuyeK8BlA1eq0B7wMy/uwsgi-2.0.24.tar.gz/uwsgiconfig.py", line 762, in __init__
      raise Exception("you need a C compiler to build uWSGI")
  Exception: you need a C compiler to build uWSGI
  ---

[zanieb]

This looks like it should be fixed by #1667

[Tonius]

Tried again with uv 0.1.5 and it appears to be fixed, thanks! 👍