Merge pull request #11919 from sbidoul/deprecate-legacy-ignore-config-settings-sbi

Deprecate legacy projects ignoring config settings

2 files changed, 10 insertions, 1 deletions

diff --git a/src/pip/_internal/pyproject.py b/src/pip/_internal/pyproject.py
index 57fef5707..eb8e12b2d 100644
--- a/src/pip/_internal/pyproject.py
+++ b/src/pip/_internal/pyproject.py
@@ -91,7 +91,7 @@ def load_pyproject_toml(
     # If we haven't worked out whether to use PEP 517 yet,
     # and the user hasn't explicitly stated a preference,
     # we do so if the project has a pyproject.toml file
-    # or if we cannot import setuptools.
+    # or if we cannot import setuptools or wheels.
 
     # We fallback to PEP 517 when without setuptools or without the wheel package,
     # so setuptools can be installed as a default build backend.
diff --git a/src/pip/_internal/req/req_install.py b/src/pip/_internal/req/req_install.py
index a0ea58bd1..d01b24a91 100644
--- a/src/pip/_internal/req/req_install.py
+++ b/src/pip/_internal/req/req_install.py
@@ -486,6 +486,15 @@ class InstallRequirement:
         )
 
         if pyproject_toml_data is None:
+            if self.config_settings:
+                deprecated(
+                    reason=f"Config settings are ignored for project {self}.",
+                    replacement=(
+                        "to use --use-pep517 or add a "
+                        "pyproject.toml file to the project"
+                    ),
+                    gone_in="23.3",
+                )
             self.use_pep517 = False
             return