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Merged
NAThompson merged 1 commit into from
Oct 30, 2026
Merged

Build the nanobind layer as a wheel #1590

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11 changes: 8 additions & 3 deletions nanobind/CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
# Dev-only nanobind layer, not built by CI. Usage (venv with nanobind numpy mpmath pytest):
# cmake -S nanobind -B build-nb -G Ninja -DPython_EXECUTABLE=venv/bin/python && cmake --build build-nb
# PYTHONPATH=build-nb venv/bin/python -m pytest nanobind/tests
# A wheel, from a checkout (an sdist would lack ../include): pip wheel --no-deps -w dist nanobind

cmake_minimum_required(VERSION 3.18)
project(boost_math_nanobind LANGUAGES CXX)
Expand All @@ -17,8 +18,9 @@ endif()
# Same optimisation level as CI.
set(CMAKE_CXX_FLAGS_RELEASE "-O2")

find_package(Python 3.9 REQUIRED COMPONENTS Interpreter Development.Module)
if(NOT nanobind_DIR)
find_package(Python 3.12 REQUIRED COMPONENTS Interpreter Development.Module OPTIONAL_COMPONENTS Development.SABIModule)
# scikit-build-core puts nanobind on the prefix path itself.
if(NOT nanobind_DIR AND NOT SKBUILD)
# -I: don't let this directory (also called nanobind) shadow the package.
execute_process(
COMMAND "${Python_EXECUTABLE}" -I -m nanobind --cmake_dir
Expand Down Expand Up @@ -48,7 +50,7 @@ set(BOOST_MATH_NB_SOURCES
src/polynomial_roots.cpp
)

nanobind_add_module(_ext NOMINSIZE ${BOOST_MATH_NB_SOURCES})
nanobind_add_module(_ext NOMINSIZE STABLE_ABI ${BOOST_MATH_NB_SOURCES})
target_include_directories(_ext PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../include" "${CMAKE_CURRENT_SOURCE_DIR}/src")
target_compile_definitions(_ext PRIVATE BOOST_MATH_STANDALONE)
# Optional: boost.math.ulps needs Boost.Multiprecision (standalone, which needs Boost.Config) and zlib. Only the
Expand All @@ -69,6 +71,7 @@ if(BOOST_MATH_NB_MULTIPRECISION_INCLUDE AND BOOST_MATH_NB_CONFIG_INCLUDE AND ZLI
COMPILE_DEFINITIONS BOOST_MP_STANDALONE)
set_source_files_properties(src/module.cpp PROPERTIES COMPILE_DEFINITIONS BMPY_HAVE_ULPS)
target_link_libraries(_ext PRIVATE ZLIB::ZLIB)
install(FILES boost/math/ulps.py DESTINATION boost/math)
else()
message(STATUS "boost.math.ulps disabled: needs Boost.Multiprecision, Boost.Config and zlib "
"(set BOOST_MATH_NB_MULTIPRECISION_INCLUDE and BOOST_MATH_NB_CONFIG_INCLUDE)")
Expand All @@ -85,3 +88,5 @@ add_custom_target(boost_math_py ALL
COMMAND "${CMAKE_COMMAND}" -E make_directory "${pkg_dir}"
COMMAND "${CMAKE_COMMAND}" -E copy_if_different
"${CMAKE_CURRENT_SOURCE_DIR}/boost/math/__init__.py" "${CMAKE_CURRENT_SOURCE_DIR}/boost/math/ulps.py" "${pkg_dir}")
install(TARGETS _ext LIBRARY DESTINATION boost/math)
install(FILES boost/math/__init__.py DESTINATION boost/math)
18 changes: 18 additions & 0 deletions nanobind/pyproject.toml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,18 @@
# pip wheel --no-deps -w dist nanobind, from the root of a Boost.Math checkout; see CMakeLists.txt.
[build-system]
requires = ["scikit-build-core>=0.10", "nanobind>=2.0"]
build-backend = "scikit_build_core.build"

[project]
name = "boost-math"
version = "0.0.1"
description = "Python bindings for Boost.Math (development build)"
license = { text = "BSL-1.0" }
requires-python = ">=3.12"
dependencies = ["numpy"]

[tool.scikit-build]
minimum-version = "build-system.requires"
wheel.packages = []
# One abi3 wheel for every Python >= 3.12.
wheel.py-api = "cp312"
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