python-utils-r1.eclass: Obtain library path from the interpreter

Obtain library path as concatenation of LIBDIR and LDLIBRARY config variables (from sysconfig module) rather than hardcoding it in the eclass. This improves maintainability and fixes compatibility with ABIFLAGS-enabled Python 3.3+.
hanetzer · Nov 11, 2015 · e0d0c11 · e0d0c11
1 parent 6cdbddf
commit e0d0c11
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Showing 2 changed files with 9 additions and 16 deletions.
diff --git a/eclass/python-utils-r1.eclass b/eclass/python-utils-r1.eclass
@@ -151,7 +151,8 @@ _python_impl_supported() {
 # The path to Python library.
 #
 # Set and exported on request using python_export().
-# Valid only for CPython.
+# Valid only for CPython. Requires a proper build-time dependency
+# on the Python implementation.
 #
 # Example value:
 # @CODE
@@ -289,20 +290,12 @@ python_export() {
 				fi
 				;;
 			PYTHON_LIBPATH)
-				local libname
-				case "${impl}" in
-					python*)
-						libname=lib${impl}
-						;;
-					*)
-						die "${impl} lacks a dynamic library"
-						;;
-				esac
-
-				local path=${EPREFIX}/usr/$(get_libdir)
-
-				export PYTHON_LIBPATH=${path}/${libname}$(get_libname)
+				export PYTHON_LIBPATH=$("${PYTHON}" -c 'import os.path, sysconfig; print(os.path.join(sysconfig.get_config_var("LIBDIR"), sysconfig.get_config_var("LDLIBRARY")) if sysconfig.get_config_var("LDLIBRARY") else "")')
 				debug-print "${FUNCNAME}: PYTHON_LIBPATH = ${PYTHON_LIBPATH}"
+
+				if [[ ! ${PYTHON_LIBPATH} ]]; then
+					die "${impl} lacks a (usable) dynamic library"
+				fi
 				;;
 			PYTHON_CFLAGS)
 				local val

diff --git a/eclass/tests/python-utils-r1.sh b/eclass/tests/python-utils-r1.sh
@@ -66,8 +66,8 @@ test_var PYTHON python2_7 /usr/bin/python2.7
 test_var PYTHON_SITEDIR python2_7 /usr/lib/python2.7/site-packages
 if [[ -x /usr/bin/python2.7 ]]; then
 	test_var PYTHON_INCLUDEDIR python2_7 /usr/include/python2.7
+	test_var PYTHON_LIBPATH python2_7 "/usr/lib*/libpython2.7$(get_libname)"
 fi
-test_var PYTHON_LIBPATH python2_7 /usr/lib/libpython2.7$(get_libname)
 test_var PYTHON_PKG_DEP python2_7 '*dev-lang/python*:2.7'
 test_var PYTHON_SCRIPTDIR python2_7 /usr/lib/python-exec/python2.7
 
@@ -77,8 +77,8 @@ test_var PYTHON_SITEDIR python3_4 /usr/lib/python3.4/site-packages
 if [[ -x /usr/bin/python3.4 ]]; then
 	abiflags=$(/usr/bin/python3.4 -c 'import sysconfig; print(sysconfig.get_config_var("ABIFLAGS"))')
 	test_var PYTHON_INCLUDEDIR python3_4 "/usr/include/python3.4${abiflags}"
+	test_var PYTHON_LIBPATH python3_4 "/usr/lib*/libpython3.4${abiflags}$(get_libname)"
 fi
-test_var PYTHON_LIBPATH python3_4 /usr/lib/libpython3.4$(get_libname)
 test_var PYTHON_PKG_DEP python3_4 '*dev-lang/python*:3.4'
 test_var PYTHON_SCRIPTDIR python3_4 /usr/lib/python-exec/python3.4