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ENH: Add libitk-wrapping pixi-build package recipe
Add a rattler-build recipe to produce a conda package containing ITK C++ libraries with full Python wrapping artifacts (SWIG interfaces, CastXML outputs, compiled Python modules, stubs). This package can be consumed as a host-dependency to skip the expensive ITK C++ build when generating Python wheels for ITK or remote modules. The recipe supports overriding the ITK source repository and tag via ITK_GIT_URL and ITK_GIT_TAG environment variables, enabling builds from feature branches and PRs for testing. Build scripts are provided for both Unix and Windows platforms. CMake flags match conda-forge's libitk-feedstock (using system libraries) plus the additional wrapping options needed for Python wheel generation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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‎packages/libitk-wrapping/build-libitk-wrapping.bat‎

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@echo off
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setlocal enabledelayedexpansion
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:: Build ITK C++ with Python wrapping for use as a conda package (Windows).
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set BUILD_DIR=%SRC_DIR%\..\build
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mkdir %BUILD_DIR%
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cd %BUILD_DIR%
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cmake ^
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-G "Ninja" ^
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%CMAKE_ARGS% ^
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-D BUILD_SHARED_LIBS:BOOL=ON ^
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-D BUILD_TESTING:BOOL=OFF ^
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-D BUILD_EXAMPLES:BOOL=OFF ^
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-D CMAKE_BUILD_TYPE:STRING=Release ^
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-D "CMAKE_INSTALL_PREFIX=%LIBRARY_PREFIX%" ^
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^
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-D ITK_WRAP_PYTHON:BOOL=ON ^
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-D ITK_WRAP_DOC:BOOL=ON ^
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-D ITK_LEGACY_SILENT:BOOL=ON ^
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-D CMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON ^
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^
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-D ITK_WRAP_unsigned_short:BOOL=ON ^
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-D ITK_WRAP_double:BOOL=ON ^
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-D ITK_WRAP_complex_double:BOOL=ON ^
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-D "ITK_WRAP_IMAGE_DIMS:STRING=2;3;4" ^
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^
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-D WRAP_ITK_INSTALL_COMPONENT_IDENTIFIER:STRING=PythonWheel ^
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-D WRAP_ITK_INSTALL_COMPONENT_PER_MODULE:BOOL=ON ^
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^
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-D ITK_USE_SYSTEM_EXPAT:BOOL=ON ^
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-D ITK_USE_SYSTEM_HDF5:BOOL=ON ^
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-D ITK_USE_SYSTEM_JPEG:BOOL=ON ^
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-D ITK_USE_SYSTEM_PNG:BOOL=ON ^
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-D ITK_USE_SYSTEM_TIFF:BOOL=ON ^
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-D ITK_USE_SYSTEM_ZLIB:BOOL=ON ^
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-D ITK_USE_SYSTEM_FFTW:BOOL=ON ^
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-D ITK_USE_SYSTEM_EIGEN:BOOL=ON ^
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-D ITK_USE_FFTWD:BOOL=ON ^
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-D ITK_USE_FFTWF:BOOL=ON ^
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^
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-D ITK_BUILD_DEFAULT_MODULES:BOOL=ON ^
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-D Module_ITKReview:BOOL=ON ^
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-D Module_ITKTBB:BOOL=ON ^
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-D Module_MGHIO:BOOL=ON ^
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-D Module_ITKIOTransformMINC:BOOL=ON ^
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-D Module_GenericLabelInterpolator:BOOL=ON ^
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-D Module_AdaptiveDenoising:BOOL=ON ^
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^
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-D ITK_USE_KWSTYLE:BOOL=OFF ^
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-D "ITK_DEFAULT_THREADER:STRING=Pool" ^
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^
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"%SRC_DIR%"
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if errorlevel 1 exit /b 1
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cmake --build . --config Release
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if errorlevel 1 exit /b 1
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cmake --install . --config Release
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if errorlevel 1 exit /b 1

‎packages/libitk-wrapping/build-libitk-wrapping.sh‎

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#!/bin/bash
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set -euo pipefail
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# Build ITK C++ with Python wrapping for use as a conda package.
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# This produces headers, shared libraries, CMake config, and all
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# wrapping metadata (SWIG .i/.idx/.mdx files, Python stubs) needed
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# by downstream ITK remote modules.
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BUILD_DIR="${SRC_DIR}/../build"
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mkdir -p "${BUILD_DIR}"
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cd "${BUILD_DIR}"
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# Use TBB on Linux; macOS has known issues with conda TBB
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use_tbb=ON
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if [ "$(uname)" = "Darwin" ]; then
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use_tbb=OFF
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fi
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# Handle cross-compilation try-run results if available
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if [[ "${CONDA_BUILD_CROSS_COMPILATION:-0}" == "1" ]]; then
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try_run_results="${RECIPE_DIR}/TryRunResults-${target_platform}.cmake"
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if [[ -f "${try_run_results}" ]]; then
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CMAKE_ARGS="${CMAKE_ARGS} -C ${try_run_results}"
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fi
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fi
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cmake \
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-G "Ninja" \
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${CMAKE_ARGS} \
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-D BUILD_SHARED_LIBS:BOOL=ON \
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-D BUILD_TESTING:BOOL=OFF \
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-D BUILD_EXAMPLES:BOOL=OFF \
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-D CMAKE_BUILD_TYPE:STRING=Release \
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-D "CMAKE_INSTALL_PREFIX=${PREFIX}" \
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\
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-D ITK_WRAP_PYTHON:BOOL=ON \
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-D ITK_WRAP_DOC:BOOL=ON \
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-D ITK_LEGACY_SILENT:BOOL=ON \
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-D CMAKE_POSITION_INDEPENDENT_CODE:BOOL=ON \
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\
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-D ITK_WRAP_unsigned_short:BOOL=ON \
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-D ITK_WRAP_double:BOOL=ON \
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-D ITK_WRAP_complex_double:BOOL=ON \
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-D "ITK_WRAP_IMAGE_DIMS:STRING=2;3;4" \
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\
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-D WRAP_ITK_INSTALL_COMPONENT_IDENTIFIER:STRING=PythonWheel \
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-D WRAP_ITK_INSTALL_COMPONENT_PER_MODULE:BOOL=ON \
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\
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-D ITK_USE_SYSTEM_EXPAT:BOOL=ON \
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-D ITK_USE_SYSTEM_HDF5:BOOL=ON \
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-D ITK_USE_SYSTEM_JPEG:BOOL=ON \
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-D ITK_USE_SYSTEM_PNG:BOOL=ON \
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-D ITK_USE_SYSTEM_TIFF:BOOL=ON \
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-D ITK_USE_SYSTEM_ZLIB:BOOL=ON \
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-D ITK_USE_SYSTEM_FFTW:BOOL=ON \
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-D ITK_USE_SYSTEM_EIGEN:BOOL=ON \
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-D ITK_USE_FFTWD:BOOL=ON \
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-D ITK_USE_FFTWF:BOOL=ON \
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\
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-D ITK_BUILD_DEFAULT_MODULES:BOOL=ON \
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-D Module_ITKReview:BOOL=ON \
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-D Module_ITKTBB:BOOL=${use_tbb} \
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-D Module_MGHIO:BOOL=ON \
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-D Module_ITKIOTransformMINC:BOOL=ON \
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-D Module_GenericLabelInterpolator:BOOL=ON \
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-D Module_AdaptiveDenoising:BOOL=ON \
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\
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-D ITK_USE_KWSTYLE:BOOL=OFF \
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-D NIFTI_SYSTEM_MATH_LIB= \
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-D GDCM_USE_COREFOUNDATION_LIBRARY:BOOL=OFF \
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-D "ITK_DEFAULT_THREADER:STRING=Pool" \
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\
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"${SRC_DIR}"
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cmake --build . --config Release
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cmake --install . --config Release

‎packages/libitk-wrapping/pixi.toml‎

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[workspace]
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channels = ["https://prefix.dev/conda-forge"]
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platforms = ["linux-64", "linux-aarch64", "osx-arm64", "osx-64", "win-64"]
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preview = ["pixi-build"]
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[dependencies]
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libitk-wrapping = { path = "." }
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python = ">=3.10"
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[package]
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name = "libitk-wrapping"
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version = "6.99.0"
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[package.build]
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backend = { name = "pixi-build-rattler-build", version = "0.3.*" }

‎packages/libitk-wrapping/recipe.yaml‎

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package:
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name: libitk-wrapping
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version: "6.99.0"
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source:
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git: ${{ env.get("ITK_GIT_URL", "https://github.com/BRAINSia/ITK.git") }}
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tag: ${{ env.get("ITK_GIT_TAG", "itk-conda-pythonpackage-support") }}
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build:
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number: 0
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script:
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- if: unix
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then: bash ${RECIPE_DIR}/build-libitk-wrapping.sh
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- if: win
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then: cmd /c ${RECIPE_DIR}/build-libitk-wrapping.bat
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requirements:
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build:
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- ${{ compiler('c') }}
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- ${{ compiler('cxx') }}
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- cmake >=3.26
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- ninja
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host:
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- python
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- swig >=4.1
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- castxml
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- expat
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- hdf5
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- libjpeg-turbo
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- libtiff
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- libpng
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- eigen
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- zlib
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- fftw
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- tbb-devel
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- doxygen
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run:
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- python
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- tbb
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- hdf5
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- fftw
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- libjpeg-turbo
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- libtiff
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- libpng
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- expat
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- zlib
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about:
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home: https://itk.org
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license: Apache-2.0
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license_file: LICENSE
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summary: >
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ITK C++ libraries with Python wrapping artifacts (SWIG interfaces,
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CastXML outputs, compiled Python modules). Used as a build dependency
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for ITK Python wheel generation and remote module packaging.
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dev_url: https://github.com/InsightSoftwareConsortium/ITK

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