Warn when doing a PEP 517 build in presence of --global-option

news/9774.feature.rst

@@ -0,0 +1,3 @@
+Warn instead of erroring out when doing a PEP 517 build in presence of
+``--build-option``. Warn when doing a PEP 517 build in presence of
+``--global-option``.

src/pip/_internal/operations/build/wheel.py

@@ -1,6 +1,6 @@
 import logging
 import os
-from typing import List, Optional
+from typing import Optional
 
 from pip._vendor.pep517.wrappers import Pep517HookCaller
 
@@ -13,7 +13,6 @@ def build_wheel_pep517(
     name,  # type: str
     backend,  # type: Pep517HookCaller
     metadata_directory,  # type: str
-    build_options,  # type: List[str]
     tempd,  # type: str
 ):
     # type: (...) -> Optional[str]
@@ -22,11 +21,6 @@ def build_wheel_pep517(
     Returns path to wheel if successfully built. Otherwise, returns None.
     """
     assert metadata_directory is not None
-    if build_options:
-        # PEP 517 does not support --build-options
-        logger.error('Cannot build wheel for %s using PEP 517 when '
-                     '--build-option is present', name)
-        return None
     try:
         logger.debug('Destination directory: %s', tempd)
 

src/pip/_internal/wheel_builder.py

@@ -244,11 +244,18 @@ def _build_one_inside_env(
         if req.use_pep517:
             assert req.metadata_directory
             assert req.pep517_backend
+            if global_options:
+                logger.warning(
+                    'Ignoring --global-option when building %s using PEP 517', req.name
+                )
+            if build_options:
+                logger.warning(
+                    'Ignoring --build-option when building %s using PEP 517', req.name
+                )
             wheel_path = build_wheel_pep517(
                 name=req.name,
                 backend=req.pep517_backend,
                 metadata_directory=req.metadata_directory,
-                build_options=build_options,
                 tempd=temp_dir.path,
             )
         else:

tests/functional/test_pep517.py

@@ -263,7 +263,20 @@ def test_pep517_and_build_options(script, tmpdir, data, common_wheels):
         '--build-option', 'foo',
         '-f', common_wheels,
         project_dir,
-        expect_error=True
     )
-    assert 'Cannot build wheel' in result.stderr
-    assert 'when --build-option is present' in result.stderr
+    assert 'Ignoring --build-option when building' in result.stderr
+    assert 'using PEP 517' in result.stderr
+
+
+@pytest.mark.network
+def test_pep517_and_global_options(script, tmpdir, data, common_wheels):
+    """Backend generated requirements are installed in the build env"""
+    project_dir, name = make_pyproject_with_setup(tmpdir)
+    result = script.pip(
+        'wheel', '--wheel-dir', tmpdir,
+        '--global-option', 'foo',
+        '-f', common_wheels,
+        project_dir,
+    )
+    assert 'Ignoring --global-option when building' in result.stderr
+    assert 'using PEP 517' in result.stderr