feat: move to scikit-build-core

.github/workflows/emscripten.yaml

@@ -46,11 +46,11 @@ jobs:
           actions-cache-folder: emsdk-cache
 
       - name: Build
-        run: CFLAGS=-fexceptions LDFLAGS=-fexceptions pyodide build
+        run: CFLAGS=-fexceptions LDFLAGS=-fexceptions pyodide build  --exports whole_archive
 
       - uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
 
       - name: Set up Pyodide virtual environment
         run: |

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
   clang-tidy:
     name: Clang-Tidy
     runs-on: ubuntu-latest
-    container: silkeh/clang:15-bullseye
+    container: silkeh/clang:18-bookworm
 
     steps:
       - name: Install requirements
@@ -31,10 +31,10 @@ jobs:
           submodules: true
 
       - name: Install extra requirements
-        run: python3 -m pip install setuptools_scm
+        run: python3 -m pip install setuptools_scm --break-system-packages
 
       - name: Configure
-        run: cmake -S . -B build -DCMAKE_CXX_CLANG_TIDY="$(which clang-tidy);--warnings-as-errors=*"
+        run: cmake -S. -Bbuild -DCMAKE_CXX_CLANG_TIDY="$(which clang-tidy);--warnings-as-errors=*"
 
       - name: Build
         run: cmake --build build -j 2
@@ -55,6 +55,7 @@ jobs:
           pipx run nox -s pylint
 
   cmake:
+    name: CMake 🐍 ${{ matrix.python-version }}
     runs-on: ubuntu-latest
     env:
       PIP_ONLY_BINARY: numpy
@@ -66,8 +67,6 @@ jobs:
           - python-version: "3.8"
             cmake-extras: "-DCMAKE_CXX_STANDARD=17"
 
-    name: CMake Python ${{ matrix.python-version }}
-
     steps:
       - uses: actions/checkout@v4
         with:
@@ -80,10 +79,10 @@ jobs:
           allow-prereleases: true
 
       - name: Install python tools
-        run: python -m pip install -r dev-requirements.txt pytest-github-actions-annotate-failures numpy>=2.0a1
+        run: python -m pip install -r dev-requirements.txt pytest-github-actions-annotate-failures numpy>=2.0.0rc1
 
       - name: Configure
-        run: cmake -S . -B build -DCMAKE_BUILD_TYPE=Debug -DBOOST_HISTOGRAM_ERRORS=ON ${{ matrix.cmake-extras }}
+        run: cmake -S. -Bbuild -DCMAKE_BUILD_TYPE=Debug -DBOOST_HISTOGRAM_ERRORS=ON ${{ matrix.cmake-extras }}
 
       - name: Build
         run: cmake --build build -j 2
@@ -93,30 +92,56 @@ jobs:
         run: python -m pytest -ra
 
   build_wheels:
-    name: Wheels on ${{ matrix.os }}
+    name: ${{ matrix.build }}
     runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, windows-2019, macos-latest]
+        include:
+          - os: ubuntu-latest
+            build: cp312-manylinux_x86_64
+          - os: windows-2019
+            build: cp38-win32
+          - os: windows-2019
+            build: cp37-win_amd64
+          - os: macos-13
+            build: cp39-macosx_x86_64
+          - os: macos-14
+            build: cp39-macosx_arm64
 
     steps:
       - uses: actions/checkout@v4
         with:
           submodules: true
           fetch-depth: 0
 
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+
       - uses: pypa/[email protected]
         env:
-          CIBW_BUILD: cp38-win32 cp312-manylinux_x86_64 cp37-macosx_x86_64
+          CIBW_BUILD: "${{ matrix.build }}"
           CIBW_BUILD_VERBOSITY: 1
-          CIBW_ENVIRONMENT: "PIP_ONLY_BINARY=:all:"
 
       - uses: actions/upload-artifact@v4
         with:
           path: wheelhouse/*
           name: test-wheels-${{ strategy.job-index }}
 
+      # Pipx is either missing or broken on macos-14 runners ATM
+      - name: Install twine
+        run: pip install twine
+
       - name: Check wheels
-        run: pipx run twine check wheelhouse/*
+        run: twine check wheelhouse/*
         shell: bash
+
+  pass:
+    if: always()
+    needs: [clang-tidy, pylint, cmake, build_wheels]
+    runs-on: ubuntu-latest
+    steps:
+      - uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}

.github/workflows/wheels.yml

@@ -15,7 +15,6 @@ concurrency:
 
 env:
   SETUPTOOLS_SCM_PRETEND_VERSION: ${{ github.event.inputs.overrideVersion }}
-  CIBW_ENVIRONMENT: "PIP_PREFER_BINARY=1"
 
 jobs:
   build_sdist:
@@ -76,15 +75,23 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [windows-2019, macos-latest]
-        arch: [auto64]
-        build: ["*"]
-
         include:
-          - os: macos-latest
-            arch: universal2
+          - os: macos-13
+            arch: auto64
+            build: "*"
+
+          - os: macos-14
+            arch: auto64
             build: "*"
 
+          - os: windows-2019
+            arch: auto64
+            build: "cp*"
+
+          - os: windows-2019
+            arch: auto64
+            build: "pp*"
+
           - os: windows-2019
             arch: auto32
             build: "*"

CMakeLists.txt

@@ -1,8 +1,10 @@
-cmake_minimum_required(VERSION 3.10...3.26)
+cmake_minimum_required(VERSION 3.24...3.29)
 
 project(BOOST_HISTOGRAM LANGUAGES CXX)
 # Version is added later
 
+include(FetchContent)
+
 # Boost histogram requires C++14
 set(CMAKE_CXX_STANDARD
     14
@@ -35,14 +37,24 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
                                                "RelWithDebInfo")
 endif()
 
-# Display versions
-message(STATUS "CMake ${CMAKE_VERSION}")
-
 # Adding pybind11 and setting up Python
 # Will display pybind11 version
-add_subdirectory(extern/pybind11)
+set(PYBIND11_FINDPYTHON TRUE)
+set(Python_ARTIFACTS_INTERACTIVE TRUE)
 
-message(STATUS "Python ${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}")
+FetchContent_Declare(
+  pybind11
+  GIT_REPOSITORY https://github.com/pybind/pybind11.git
+  GIT_TAG 3e9dfa2866941655c56877882565e7577de6fc7b # v2.12.0
+  FIND_PACKAGE_ARGS NAMES pybind11)
+FetchContent_MakeAvailable(pybind11)
+
+# Display versions
+message(STATUS "CMake ${CMAKE_VERSION}")
+message(STATUS "Python ${Python_VERSION_MAJOR}.${Python_VERSION_MINOR}")
+if(DEFINED pybind11_VERSION)
+  message(STATUS "pybind11 ${pybind11_VERSION}")
+endif()
 
 # This is completely optional and just adds hints to IDEs - no affect on build at all.
 file(GLOB_RECURSE BOOST_HIST_FILES "extern/histogram/include/*.hpp")
@@ -53,7 +65,7 @@ file(GLOB_RECURSE BOOST_HIST_PY_HEADERS "include/bh_python/*.hpp")
 file(GLOB BOOST_HIST_PY_SRC CONFIGURE_DEPENDS src/*.cpp)
 
 # This is the Python module
-pybind11_add_module(_core SHARED ${BOOST_HIST_PY_HEADERS} ${BOOST_HIST_PY_SRC} ${BOOST_HIST_FILES})
+pybind11_add_module(_core MODULE ${BOOST_HIST_PY_HEADERS} ${BOOST_HIST_PY_SRC} ${BOOST_HIST_FILES})
 
 # Add the include directory for boost/histogram/python
 target_include_directories(_core PRIVATE include)
@@ -69,9 +81,16 @@ target_include_directories(
          extern/throw_exception/include
          extern/variant2/include)
 
-# Useful flags
-target_compile_options(_core
-                       PRIVATE $<IF:$<CXX_COMPILER_ID:MSVC>,/fp:fast,-funsafe-math-optimizations>)
+# Support older Windows from newer MSVC
+target_compile_options(_core PRIVATE $<$<CXX_COMPILER_ID:MSVC>:/d2FH4->)
+
+# Better error messages
+target_compile_definitions(_core PRIVATE PYBIND11_DETAILED_ERROR_MESSAGES)
+
+# Atomic is required for armv7l
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "armv7l")
+  target_link_libraries(_core PRIVATE atomic)
+endif()
 
 # This makes IDE's like XCode mimic the Boost Histogram structure
 source_group(
@@ -126,38 +145,37 @@ endif()
 # which confuses Python.
 set_property(TARGET _core PROPERTY LIBRARY_OUTPUT_DIRECTORY "$<1:boost_histogram>")
 
-# Collect all the python files and symlink them (3.14+) or copy them (3.12-3.13)
-# into the build directory
+# Collect all the python files and symlink them into the build directory
 # Protects from in-source builds (don't do this, please)
-if(NOT "${CMAKE_CURRENT_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_BINARY_DIR}")
+if(NOT "${CMAKE_CURRENT_SOURCE_DIR}" STREQUAL "${CMAKE_CURRENT_BINARY_DIR}" AND NOT DEFINED
+                                                                                SKBUILD)
   file(
     GLOB_RECURSE BOOST_HIST_PY_FILES
     LIST_DIRECTORIES false
     RELATIVE "${CMAKE_CURRENT_SOURCE_DIR}/src"
     CONFIGURE_DEPENDS "src/boost_histogram/*.py")
   foreach(F IN LISTS BOOST_HIST_PY_FILES)
-    if(CMAKE_VERSION VERSION_LESS 3.14)
-      get_filename_component(FDIR "${F}" DIRECTORY)
-      file(COPY "${CMAKE_CURRENT_SOURCE_DIR}/src/${F}"
-           DESTINATION "${CMAKE_CURRENT_BINARY_DIR}/${FDIR}")
-    else()
-      file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/${F}")
-      file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/src/${F}" "${CMAKE_CURRENT_BINARY_DIR}/${F}"
-           COPY_ON_ERROR SYMBOLIC)
-    endif()
+    file(REMOVE "${CMAKE_CURRENT_BINARY_DIR}/${F}")
+    file(CREATE_LINK "${CMAKE_CURRENT_SOURCE_DIR}/src/${F}" "${CMAKE_CURRENT_BINARY_DIR}/${F}"
+         COPY_ON_ERROR SYMBOLIC)
   endforeach()
 endif()
 
 # Support installing
-install(DIRECTORY "src/boost_histogram" DESTINATION ".")
-install(FILES "${CMAKE_CURRENT_BINARY_DIR}/boost_histogram/version.py"
-        DESTINATION "boost_histogram")
 install(TARGETS _core DESTINATION "boost_histogram")
 
-# Tests (Requires pytest to be available to run)
-include(CTest)
+if(NOT DEFINED SKBUILD)
+  install(DIRECTORY "src/boost_histogram" DESTINATION ".")
+  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/boost_histogram/version.py"
+          DESTINATION "boost_histogram")
 
-if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/boost_histogram/version.py")
+  # Tests (Requires pytest to be available to run)
+  include(CTest)
+endif()
+
+if(DEFINED SKBUILD)
+  # Don't worry about the version
+elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/src/boost_histogram/version.py")
   set(VERSION_REGEX [=[version[ \t]*=[ \t]*["']([0-9]+\.[0-9]+\.[0-9]+)]=])
 
   # Read in the line containing the version
@@ -170,37 +188,26 @@ else()
   pybind11_find_import(setuptools_scm REQUIRED)
 
   execute_process(
-    COMMAND
-      ${PYTHON_EXECUTABLE} -c
-      "from setuptools_scm import get_version; print(get_version(root='${CMAKE_CURRENT_SOURCE_DIR}'))"
-    RESULT_VARIABLE VERSION_PRESENT
+    COMMAND ${Python_EXECUTABLE} -c "from setuptools_scm import get_version; print(get_version())"
+    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
     OUTPUT_VARIABLE VERSION_FULL_STRING
-    ERROR_VARIABLE VERSION_ERROR)
+    OUTPUT_STRIP_TRAILING_WHITESPACE COMMAND_ERROR_IS_FATAL ANY)
 
-  if(ERROR_VARIABLE)
-    message(STATUS "Warning from setuptools_scm:\n${ERROR_VARIABLE}")
-  endif()
-
-  if(NOT VERSION_PRESENT EQUAL 0)
-    message(
-      FATAL_ERROR
-        "Cannot detect ${VERSION_PRESENT} the version from setuptools_scm\n${VERSION_STRING}")
-  endif()
-
-  string(STRIP "${VERSION_FULL_STRING}" VERSION_FULL_STRING)
   string(REGEX MATCH [=[^[0-9]+\.[0-9]+\.[0-9]+]=] VERSION_STRING "${VERSION_FULL_STRING}")
   string(REPLACE "-" "." VERSION_STRING "${VERSION_STRING}")
   file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/boost_histogram/version.py"
        "version = '${VERSION_FULL_STRING}'")
   message(STATUS "Full version output: ${VERSION_FULL_STRING}")
 endif()
 
-project(
-  BOOST_HISTOGRAM
-  LANGUAGES CXX
-  VERSION ${VERSION_STRING})
-message(STATUS "boost-histogram ${BOOST_HISTOGRAM_VERSION}")
+if(NOT DEFINED SKBUILD)
+  project(
+    BOOST_HISTOGRAM
+    LANGUAGES CXX
+    VERSION ${VERSION_STRING})
+  message(STATUS "boost-histogram ${BOOST_HISTOGRAM_VERSION}")
 
-if(BUILD_TESTING)
-  add_subdirectory(tests)
+  if(BUILD_TESTING)
+    add_subdirectory(tests)
+  endif()
 endif()

README.md

@@ -195,7 +195,7 @@ platforms have wheels provided in boost-histogram:
 | ManyLinux2014    | 64-bit      | 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 | 3.7, 3.8, 3.9, 3.10 |
 | ManyLinux2014    | ARM64       | 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 | 3.7, 3.8, 3.9, 3.10 |
 | MuslLinux_1_1    | 64-bit      | 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 |                     |
-| macOS 10.9+      | 64-bit      | 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 | 3.7, 3.8, 3.9, 3.10 |
+| macOS 10.9+      | 64-bit      | 3.7                             | 3.7, 3.8, 3.9, 3.10 |
 | macOS Universal2 | Arm64       | 3.8, 3.9, 3.10, 3.11, 3.12      |                     |
 | Windows          | 32 & 64-bit | 3.7, 3.8, 3.9, 3.10, 3.11, 3.12 |                     |
 | Windows          | 64-bit      |                                 | 3.7, 3.8, 3.9, 3.10 |

dev-requirements.txt

@@ -1,10 +1,8 @@
 cloudpickle
-dataclasses; python_version<'3.7'
 hypothesis >=6.0
 numpy
 pytest >=6,!=6.1.0,!=7.1.0
 pytest-benchmark
-setuptools >=42
 setuptools_scm[toml] >=3.4,!=4.0.0
 typing_extensions; python_version<'3.8'
 uproot