New submission from STINNER Victor <vstin...@redhat.com>:
Since 2010, the Fedora packages of Python are using a patch on distutils UnixCCompiler to remove standard library path from rpath. The patch has been written by David Malcolm for Python 2.6.4: * https://src.fedoraproject.org/rpms/python38/blob/master/f/00001-rpath.patch * https://src.fedoraproject.org/rpms/python2/c/f5df1f834310948b32407933e3b8713e1121105b I propose to make this change upstream so other Linux distributions will benefit on this change: see attached PR. "rpath" stands for "run-time search path". Dynamic linking loaders use the rpath to find required libraries: https://en.wikipedia.org/wiki/Rpath Full example. Install Python in /opt/py38 with RPATH=/opt/py38/lib, to ensure that Python looks for libpython in this directory: $ cd path/to/python/sources $ ./configure --prefix /opt/py38 LDFLAGS="-Wl,-rpath=/opt/py38/lib/" --enable-shared $ make $ make install # on my system, my user can write into /opt ;-) $ objdump -a -x /opt/py38/bin/python3.8|grep -i rpath RPATH /opt/py38/lib/ $ objdump -a -x /opt/py38/lib/libpython3.8m.so|grep -i rpath RPATH /opt/py38/lib/ Python is installed with RPATH: $ /opt/py38/bin/python3.8 -m sysconfig|grep -i rpath BLDSHARED = "gcc -pthread -shared -Wl,-rpath=/opt/py38/lib/" CONFIGURE_LDFLAGS = "-Wl,-rpath=/opt/py38/lib/" CONFIG_ARGS = "'--prefix' '/opt/py38' 'LDFLAGS=-Wl,-rpath=/opt/py38/lib/' '--enable-shared'" LDFLAGS = "-Wl,-rpath=/opt/py38/lib/" LDSHARED = "gcc -pthread -shared -Wl,-rpath=/opt/py38/lib/" PY_CORE_LDFLAGS = "-Wl,-rpath=/opt/py38/lib/" PY_LDFLAGS = "-Wl,-rpath=/opt/py38/lib/" Now the difference is how these flags are passed to third party C extensions. $ cd $HOME $ /opt/py38/bin/python3.8 -m venv opt_env $ opt_env/bin/python -m pip install lxml $ objdump -a -x $(opt_env/bin/python -c 'import lxml.etree; print(lxml.etree.__file__)')|grep -i rpath RPATH /opt/py38/lib/ lxml is compiled with the RPATH. This issue proposes to omit the Python RPATH here. Comparison with Fedora Python which already contains the change: $ python3 -m venv fed_venv # FYI: it's Python 3.7 on Fedora 29 $ fed_venv/bin/python -m pip install lxml $ objdump -a -x $(fed_venv/bin/python -c 'import lxml.etree; print(lxml.etree.__file__)')|grep -i rpath ^^ empty output: no RPATH, it's the expected behavior ... I'm not sure that the example using /usr/bin/python3.7 is useful, because it's not built using RPATH ... $ objdump -a -x /usr/bin/python3.7 |grep -i rpath $ python3.7 -m sysconfig|grep -i rpath $ objdump -a -x /usr/lib64/libpython3.7m.so |grep -i rpath ^^ no output, it's not built with RPATH ---------- components: Library (Lib) messages: 340496 nosy: vstinner priority: normal severity: normal status: open title: distutils UnixCCompiler: Remove standard library path from rpath versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36659> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
