Merge pull request #2236 from pypa/bugfix/2228-spawn-missing

Restore support for spawn when compiler is missing

CHANGES.rst

+v49.0.1
+-------
+
+* #2228: Applied fix for pypa/distutils#3, restoring expectation that spawn will raise a DistutilsExecError when attempting to execute a missing file.
+
+
 v49.1.0
 -------
 

setuptools/_distutils/spawn.py

@@ -71,9 +71,15 @@ def spawn(cmd, search_path=1, verbose=0, dry_run=0):
             env = dict(os.environ,
                        MACOSX_DEPLOYMENT_TARGET=cur_target)
 
+    try:
         proc = subprocess.Popen(cmd, env=env)
         proc.wait()
         exitcode = proc.returncode
+    except OSError as exc:
+        if not DEBUG:
+            cmd = cmd[0]
+        raise DistutilsExecError(
+            "command %r failed: %s" % (cmd, exc.args[-1])) from exc
 
     if exitcode:
         if not DEBUG:

setuptools/_distutils/tests/test_spawn.py

@@ -126,6 +126,11 @@ class SpawnTestCase(support.TempdirManager,
                     rv = find_executable(program)
                     self.assertEqual(rv, filename)
 
+    def test_spawn_missing_exe(self):
+        with self.assertRaises(DistutilsExecError) as ctx:
+            spawn(['does-not-exist'])
+            assert 'command does-no-exist failed' in str(ctx)
+
 
 def test_suite():
     return unittest.makeSuite(SpawnTestCase)