Switch to scikit-build-core (#20)

This commit switches from scikit-build to scikit-build-core, which significantly simplifies the example build system and brings other benefits like a stable ABI3 wheels.

Author: henryiii

.github/workflows/wheels.yml

@@ -12,7 +12,6 @@ on:
 
 env:
   # Python 3.12+ is handled using the stable ABI, no need to build later versions
-  CIBW_PROJECT_REQUIRES_PYTHON: ">=3.8, <=3.12"
   # Only build for PyPy 3.9
   CIBW_SKIP: "pp37* pp38*"
   # Target 64 bit architectures (x86_64, and arm64 on macOS)
@@ -66,7 +65,7 @@ jobs:
       with:
         submodules: true
 
-    - uses: pypa/cibuildwheel@v2.12.0
+    - uses: pypa/cibuildwheel@v2.13.0
 
     - name: Verify clean directory
       run: git diff --exit-code

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.18...3.22)
+cmake_minimum_required(VERSION 3.15...3.26)
 
 project(nanobind_example LANGUAGES CXX)
 
@@ -17,28 +17,14 @@ if (NOT SKBUILD)
   in your environment once and use the following command that avoids
   a costly creation of a new virtual environment at every compilation:
   =====================================================================
-   $ python setup.py install
+   $ pip install --no-build-isolation -v .
   =====================================================================")
 endif()
 
-# Perform a release build by default
-if (NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
-  set(CMAKE_BUILD_TYPE Release CACHE STRING "Choose the type of build." FORCE)
-  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release" "MinSizeRel" "RelWithDebInfo")
-endif()
-
-# Create CMake targets for all Python components needed by nanobind
-if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.26 AND Python_INTERPRETER_ID STREQUAL "Python")
-  find_package(Python 3.8 COMPONENTS Interpreter Development.Module Development.SABIModule REQUIRED)
-else()
-  find_package(Python 3.8 COMPONENTS Interpreter Development.Module REQUIRED)
-endif()
-
-# Determine the nanobind CMake include path and register it
-execute_process(
-  COMMAND "${Python_EXECUTABLE}" -m nanobind --cmake_dir
-  OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE NB_DIR)
-list(APPEND CMAKE_PREFIX_PATH "${NB_DIR}")
+# Try to import all Python components potentially needed by nanobind
+find_package(Python 3.8
+  REQUIRED COMPONENTS Interpreter Development.Module
+  OPTIONAL_COMPONENTS Development.SABIModule)
 
 # Import nanobind through CMake's find_package mechanism
 find_package(nanobind CONFIG REQUIRED)
@@ -66,4 +52,4 @@ nanobind_add_module(
 )
 
 # Install directive for scikit-build
-install(TARGETS nanobind_example_ext LIBRARY DESTINATION .)
+install(TARGETS nanobind_example_ext LIBRARY DESTINATION nanobind_example)

pyproject.toml

@@ -1,11 +1,24 @@
 [build-system]
-requires = [
-    "setuptools>=42",
-    "wheel",
-    "scikit-build>=0.16.7",
-    "cmake>=3.18",
-    "nanobind>=1.1.0",
-    "ninja; platform_system!='Windows'"
+requires = ["scikit-build-core >=0.4.3", "nanobind >=1.3.1"]
+build-backend = "scikit_build_core.build"
+
+[project]
+name = "nanobind-example"
+version = "0.0.1"
+description = "An example minimal project that compiles bindings using nanobind and scikit-build"
+readme = "README.md"
+requires-python = ">=3.8"
+authors = [
+    { name = "Wenzel Jakob", email = "[email protected]" },
+]
+classifiers = [
+    "License :: BSD",
 ]
 
-build-backend = "setuptools.build_meta"
+[project.urls]
+Homepage = "https://github.com/wjakob/nanobind_example"
+
+
+[tool.scikit-build]
+# Build stable ABI wheels for CPython 3.12+
+wheel.py-api = "cp312"