[gentoo-commits] repo/gentoo:master commit in: eclass/

["Michał Górny" <mgorny@gentoo.org>]

commit:     314c6b009037cf21ddfb35b6c372c5dd3819e0c5
Author:     Michał Górny <mgorny <AT> gentoo <DOT> org>
AuthorDate: Tue May 14 12:09:24 2024 +0000
Commit:     Michał Górny <mgorny <AT> gentoo <DOT> org>
CommitDate: Mon May 20 16:56:43 2024 +0000
URL:        https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=314c6b00

distutils-r1.eclass: Support reusing prior wheels when compatible

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 <mgorny <AT> 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