Pass CMAKE_MAKE_PROGRAM if Ninja from Python venv is used

src/py_build_cmake/build.py

@@ -1,7 +1,9 @@
 from __future__ import annotations
 
+import contextlib
 import logging
 import os
+import platform
 import shutil
 import tempfile
 from pathlib import Path
@@ -434,6 +436,17 @@ def python_tag_to_cmake(x: str | None):
         if btype:  # -D CMAKE_BUILD_TYPE={type}
             options["CMAKE_BUILD_TYPE:STRING"] = btype
 
+        # Check if we need to pass the Ninja path to CMake
+        generator: str | None = cmake_cfg.get("generator")
+        make_program: Path | None = None
+        if generator is not None and "ninja" in generator.lower():
+            with contextlib.suppress(ImportError):
+                import ninja  # type: ignore[import-not-found]
+
+                make_program = Path(ninja.BIN_DIR) / "ninja"
+                if platform.system() == "Windows":
+                    make_program = make_program.with_suffix(".exe")
+
         # CMake options
         return CMaker(
             cmake_settings=CMakeSettings(
@@ -452,7 +465,8 @@ def python_tag_to_cmake(x: str | None):
                 options=options,
                 args=cmake_cfg.get("args", []),
                 preset=cmake_cfg.get("preset"),
-                generator=cmake_cfg.get("generator"),
+                generator=generator,
+                make_program=make_program,
                 cross_compiling=cross_compiling,
                 **cross_opts,
             ),

src/py_build_cmake/commands/cmake.py

@@ -36,6 +36,7 @@ class CMakeConfigureSettings:
     args: list[str]
     preset: str | None
     generator: str | None
+    make_program: Path | None
     cross_compiling: bool
     toolchain_file: Path | None
     python_prefix: Path | None
@@ -200,6 +201,17 @@ def get_configure_options_install(self) -> list[Option]:
             ]
         return []
 
+    def get_configure_options_make(self) -> list[Option]:
+        """Sets CMAKE_MAKE_PROGRAM."""
+        if self.conf_settings.make_program:
+            opt = Option(
+                "CMAKE_MAKE_PROGRAM",
+                self.conf_settings.make_program.as_posix(),
+                "FILEPATH",
+            )
+            return [opt]
+        return []
+
     def get_configure_options_toolchain(self) -> list[str]:
         """Sets CMAKE_TOOLCHAIN_FILE."""
         return (
@@ -223,6 +235,7 @@ def get_preload_options(self) -> list[Option]:
         """Get the list of options set in the CMake pre-load script (-C)."""
         return (
             self.get_configure_options_package()
+            + self.get_configure_options_make()
             + self.get_configure_options_python()
             + self.get_configure_options_install()
         )