ENH: raise SystemExit when calling meson fails

Fixes #228.

mesonpy/__init__.py

@@ -649,7 +649,9 @@ def _get_config_key(self, key: str) -> Any:
     def _proc(self, *args: str) -> None:
         """Invoke a subprocess."""
         print('{cyan}{bold}+ {}{reset}'.format(' '.join(args), **_STYLES))
-        subprocess.check_call(list(args), env=self._env)
+        r = subprocess.run(list(args), env=self._env)
+        if r.returncode != 0:
+            raise SystemExit(r.returncode)
 
     def _meson(self, *args: str) -> None:
         """Invoke Meson."""

tests/test_pep517.py

@@ -27,11 +27,12 @@ def which(prog: str) -> bool:
         # smoke check for the future if we add another usage
         raise AssertionError(f'Called with {prog}, tests not expecting that usage')
 
+    subprocess_run = subprocess.run
+
     def run(cmd: List[str], *args: object, **kwargs: object) -> subprocess.CompletedProcess:
-        if cmd != ['ninja', '--version']:
-            # smoke check for the future if we add another usage
-            raise AssertionError(f'Called with {cmd}, tests not expecting that usage')
-        return subprocess.CompletedProcess(cmd, 0, f'{ninja}\n', '')
+        if cmd == ['ninja', '--version']:
+            return subprocess.CompletedProcess(cmd, 0, f'{ninja}\n', '')
+        return subprocess_run(cmd, *args, **kwargs)
 
     monkeypatch.setattr(shutil, 'which', which)
     monkeypatch.setattr(subprocess, 'run', run)