Fix config-settings handling in pip install (#9115)

* Fix config_settings handling in pip install

* Fix formatting

* Fix flag use_system_libxgboost

* Add setuptools to doc requirements.txt

* Fix mypy

python-package/packager/build_config.py

@@ -26,23 +26,18 @@ class BuildConfiguration:  # pylint: disable=R0902
     # Special option: See explanation below
     use_system_libxgboost: bool = False
 
-    def _set_config_setting(
-        self, config_settings: Dict[str, Any], field_name: str
-    ) -> None:
-        if field_name in config_settings:
+    def _set_config_setting(self, config_settings: Dict[str, Any]) -> None:
+        for field_name in config_settings:
             setattr(
                 self,
                 field_name,
                 (config_settings[field_name].lower() in ["true", "1", "on"]),
             )
-        else:
-            raise ValueError(f"Field {field_name} is not a valid config_settings")
 
     def update(self, config_settings: Optional[Dict[str, Any]]) -> None:
         """Parse config_settings from Pip (or other PEP 517 frontend)"""
         if config_settings is not None:
-            for field_name in [x.name for x in dataclasses.fields(self)]:
-                self._set_config_setting(config_settings, field_name)
+            self._set_config_setting(config_settings)
 
     def get_cmake_args(self) -> List[str]:
         """Convert build configuration to CMake args"""

python-package/packager/nativelib.py

@@ -130,20 +130,21 @@ def locate_or_build_libxgboost(
     """Locate libxgboost; if not exist, build it"""
     logger = logging.getLogger("xgboost.packager.locate_or_build_libxgboost")
 
-    libxgboost = locate_local_libxgboost(toplevel_dir, logger=logger)
-    if libxgboost is not None:
-        return libxgboost
     if build_config.use_system_libxgboost:
         # Find libxgboost from system prefix
         sys_prefix = pathlib.Path(sys.prefix).absolute().resolve()
-        libxgboost = sys_prefix / "lib" / _lib_name()
-        if not libxgboost.exists():
+        libxgboost_sys = sys_prefix / "lib" / _lib_name()
+        if not libxgboost_sys.exists():
             raise RuntimeError(
                 f"use_system_libxgboost was specified but {_lib_name()} is "
-                f"not found in {libxgboost.parent}"
+                f"not found in {libxgboost_sys.parent}"
             )
 
-        logger.info("Using system XGBoost: %s", str(libxgboost))
+        logger.info("Using system XGBoost: %s", str(libxgboost_sys))
+        return libxgboost_sys
+
+    libxgboost = locate_local_libxgboost(toplevel_dir, logger=logger)
+    if libxgboost is not None:
         return libxgboost
 
     if toplevel_dir.joinpath("cpp_src").exists():

python-package/packager/pep517.py

@@ -79,7 +79,8 @@ def build_wheel(
         libxgboost = locate_or_build_libxgboost(
             TOPLEVEL_DIR, build_dir=build_dir, build_config=build_config
         )
-        copy_with_logging(libxgboost, lib_path, logger=logger)
+        if not build_config.use_system_libxgboost:
+            copy_with_logging(libxgboost, lib_path, logger=logger)
 
         with cd(workspace):
             wheel_name = hatchling.build.build_wheel(