Support reusing the wheels built for earlier Python implementations if they are compatible with the subsequent implementations being built. This includes pure Python wheels in packages that do not set DISTUTILS_EXT, and stable ABI wheels.
Closes: https://bugs.gentoo.org/931689 Signed-off-by: Michał Górny <mgo...@gentoo.org> --- eclass/distutils-r1.eclass | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/eclass/distutils-r1.eclass b/eclass/distutils-r1.eclass index 29e901720e6c..a8f9817a3cf0 100644 --- a/eclass/distutils-r1.eclass +++ b/eclass/distutils-r1.eclass @@ -189,6 +189,18 @@ esac # ${DISTUTILS_DEPS}" # @CODE +# @ECLASS_VARIABLE: DISTUTILS_ALLOW_WHEEL_REUSE +# @DEFAULT_UNSET +# @USER_VARIABLE +# @DESCRIPTION: +# If set to a non-empty value, the eclass is allowed to reuse a wheel +# that was built for a prior Python implementation, provided that it is +# compatible with the current one, rather than building a new one. +# +# This is an optimization that can avoid the overhead of calling into +# the build system in pure Python packages and packages using the stable +# Python ABI. + if [[ -z ${_DISTUTILS_R1_ECLASS} ]]; then _DISTUTILS_R1_ECLASS=1 @@ -1585,6 +1597,32 @@ distutils-r1_python_compile() { esac if [[ ${DISTUTILS_USE_PEP517} ]]; then + if [[ ${DISTUTILS_ALLOW_WHEEL_REUSE} ]]; then + local whl + for whl in "${!DISTUTILS_WHEELS[@]}"; do + # use only wheels corresponding to the current directory + if [[ ${PWD} != ${DISTUTILS_WHEELS["${whl}"]} ]]; then + continue + fi + + # 1. Use pure Python wheels only if we're not expected + # to build extensions. Otherwise, we may end up + # not building the extension at all when e.g. PyPy3 + # is built without one. + # + # 2. For CPython, we can reuse stable ABI wheels. Note + # that this relies on the assumption that we're building + # from the oldest to the newest implementation, + # and the wheels are forward-compatible. + if [[ ( ! ${DISTUTILS_EXT} && ${whl} == *py3-none-any* ) || + ( ${EPYTHON} == python* && ${whl} == *-abi3-* ) ]] + then + distutils_wheel_install "${BUILD_DIR}/install" "${whl}" + return + fi + done + fi + distutils_pep517_install "${BUILD_DIR}/install" DISTUTILS_WHEELS+=( "${DISTUTILS_WHEEL_PATH}" "${PWD}" ) fi -- 2.45.1
