Ch

Author: Behemyth

.vscode/settings.json

@@ -15,5 +15,9 @@
         },
         "editor.defaultFormatter": "charliermarsh.ruff"
     },
-    "cmake.ignoreCMakeListsMissing": true
+    "cmake.ignoreCMakeListsMissing": true,
+    "files.associations": {
+        "*.md": "markdown",
+        "xstring": "cpp"
+    }
 }

cppython/build/backend.py

@@ -28,18 +28,23 @@ def _inject_toolchain(config_settings: dict[str, Any] | None, toolchain_file: Pa
     settings = dict(config_settings) if config_settings else {}
 
     if toolchain_file and toolchain_file.exists():
-        # scikit-build-core accepts cmake.define.VAR_NAME format
-        toolchain_key = 'cmake.define.CMAKE_TOOLCHAIN_FILE'
-
-        # Don't override if user explicitly set a toolchain file
-        if toolchain_key not in settings:
-            settings[toolchain_key] = str(toolchain_file.absolute())
-            logger.info('CPPython: Injected CMAKE_TOOLCHAIN_FILE=%s', toolchain_file)
+        # scikit-build-core accepts cmake.args for passing CMake arguments
+        # Using cmake.args passes the toolchain via -DCMAKE_TOOLCHAIN_FILE=...
+        args_key = 'cmake.args'
+        toolchain_arg = f'-DCMAKE_TOOLCHAIN_FILE={toolchain_file.absolute()}'
+
+        # Append to existing args or create new
+        if args_key in settings:
+            existing = settings[args_key]
+            # Check if toolchain is already specified
+            if 'CMAKE_TOOLCHAIN_FILE' not in existing:
+                settings[args_key] = f'{existing};{toolchain_arg}'
+                logger.info('CPPython: Appended CMAKE_TOOLCHAIN_FILE to cmake.args')
+            else:
+                logger.info('CPPython: User-specified toolchain file takes precedence')
         else:
-            logger.info(
-                'CPPython: User-specified toolchain file takes precedence: %s',
-                settings[toolchain_key],
-            )
+            settings[args_key] = toolchain_arg
+            logger.info('CPPython: Injected CMAKE_TOOLCHAIN_FILE=%s', toolchain_file)
 
     return settings
 

cppython/plugins/conan/plugin.py

@@ -87,7 +87,7 @@ def _install_dependencies(self, *, update: bool = False, groups: list[str] | Non
             raise ProviderInstallationError('conan', f'Failed to prepare {operation} environment: {e}', e) from e
 
         try:
-            build_types = ['Release', 'Debug']
+            build_types = self.data.build_types
             for build_type in build_types:
                 logger.info('Installing dependencies for build type: %s', build_type)
                 self._run_conan_install(conanfile_path, update, build_type, logger)
@@ -161,6 +161,13 @@ def _run_conan_install(self, conanfile_path: Path, update: bool, build_type: str
         # Build conan install command arguments
         command_args = ['install', str(conanfile_path)]
 
+        # Use build_path as the output folder directly
+        output_folder = self.core_data.cppython_data.build_path
+        command_args.extend(['--output-folder', str(output_folder)])
+
+        # Override cmake_layout's default 'build' subfolder to normalize path structure
+        command_args.extend(['-c', 'tools.cmake.cmake_layout:build_folder=.'])
+
         # Add build missing flag
         command_args.extend(['--build', 'missing'])
 
@@ -276,6 +283,8 @@ def _create_cmake_sync_data(self) -> CMakeSyncData:
         Returns:
             CMakeSyncData configured for Conan integration
         """
+        # With tools.cmake.cmake_layout:build_folder=. and --output-folder=build_path,
+        # generators are placed directly in build_path/generators/
         conan_toolchain_path = self.core_data.cppython_data.build_path / 'generators' / 'conan_toolchain.cmake'
 
         return CMakeSyncData(

cppython/plugins/conan/resolution.py

@@ -123,4 +123,5 @@ def resolve_conan_data(data: dict[str, Any], core_data: CorePluginData) -> Conan
         remotes=parsed_data.remotes,
         skip_upload=parsed_data.skip_upload,
         profile_dir=profile_dir,
+        build_types=parsed_data.build_types,
     )

cppython/plugins/conan/schema.py

@@ -295,6 +295,7 @@ class ConanData(CPPythonModel):
     remotes: list[str]
     skip_upload: bool
     profile_dir: Path
+    build_types: list[str]
 
 
 class ConanfileGenerationData(CPPythonModel):
@@ -328,3 +329,13 @@ class ConanConfiguration(CPPythonModel):
             "If a relative path is provided, it will be resolved relative to the tool's working directory."
         ),
     ] = 'profiles'
+    build_types: Annotated[
+        list[str],
+        Field(
+            alias='build-types',
+            description='List of CMake build types to install dependencies for. '
+            'For multi-config generators (Visual Studio), use both Release and Debug. '
+            'For single-config generators or build backends like scikit-build-core, '
+            'use only the build type you need (e.g., ["Release"]).',
+        ),
+    ] = ['Release', 'Debug']

examples/conan_cmake/extension/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.15...3.30)
+cmake_minimum_required(VERSION 4.0)
 project(example_extension LANGUAGES CXX)
 
 # Find Python and nanobind (nanobind will be found via Conan toolchain)

examples/conan_cmake/extension/pyproject.toml

@@ -27,3 +27,5 @@ dependencies = ["fmt>=11.0.2", "nanobind>=2.4.0"]
 
 [tool.cppython.providers.conan]
 # Conan provider configuration
+# Only install Release build type for scikit-build-core (single-config builds)
+build-types = ["Release"]

examples/conan_cmake/extension/src/example_extension/_core.cpp

@@ -6,6 +6,7 @@
  */
 
 #include <nanobind/nanobind.h>
+#include <nanobind/stl/string.h>
 #include <fmt/core.h>
 
 namespace nb = nanobind;

examples/conan_cmake/library/pyproject.toml

@@ -17,8 +17,6 @@ install-path = "install"
 
 dependencies = ["fmt>=12.1.0"]
 
-[tool.cppython.generators.cmake]
-cmake_binary = "C:/Program Files/CMake/bin/cmake.exe"
 
 [tool.cppython.providers.conan]
 

examples/conan_cmake/simple/pyproject.toml

@@ -17,9 +17,6 @@ install-path = "install"
 
 dependencies = ["fmt>=12.1.0"]
 
-[tool.cppython.generators.cmake]
-cmake_binary = "C:/Program Files/CMake/bin/cmake.exe"
-
 [tool.cppython.providers.conan]
 
 [tool.pdm]