New submission from Sandro Mani:
I'm using Python3 as available in Fedora rawhide
(python3-3.3.0-2.fc19.x86_64).
Attempting to build a project using python3/distutils, I noticed that
find_library_file would not find any library at all. Some investigation
showed that this was due to the fact that libraries were searched with
the ".cpython-33m.so" extension. Even more investigation showed that the
library extension was read being overridden by the one defined in the
/usr/lib64/python3.3/config-3.3m/Makefile shipped by python3-libs. See
below for the detailed analysis. The python-versioned extension
obviously makes no sense for regular shared objects which are not python
binary modules, so this is clearly wrong. As a workaround I patched
sysconfig.py to comment out customize_compiler::235
(compiler.shared_lib_extension =
so_ext, see below), recompiled python (all tests still pass), and things seem
to work.
Detailed analysis:
setup.py:
def _find_library_file(self, library):
return self.compiler.find_library_file(self.compiler.library_dirs,
library)
---
In function
/usr/lib64/python3.3/distutils/unixcompiler.py at find_library_file::266:
shared_f = self.library_filename(lib, lib_type='shared')
In function
/usr/lib64/python3.3/distutils/ccompiler.py at library_filename::882:
ext = getattr(self, lib_type + "_lib_extension")
-> Where does shared_lib_extension get defined?
* At /usr/lib64/python3.3/distutils/ccompiler.py::66
shared_lib_extension = None -> default for abstract class
* At /usr/lib64/python3.3/distutils/unixcompiler.py::77
shared_lib_extension = ".so" -> this is the correct value
* In function
/usr/lib64/python3.3/distutils/sysconfig.py at customize_compiler::235
by /usr/lib64/python3.3/distutils/sysconfig.py at customize_compiler::235
compiler.shared_lib_extension = so_ext
by /usr/lib64/python3.3/distutils/sysconfig.py at customize_compiler::194
(cc, cxx, opt, cflags, ccshared, ldshared, so_ext, ar, ar_flags) = \
get_config_vars('CC', 'CXX', 'OPT', 'CFLAGS',
'CCSHARED', 'LDSHARED', 'SO', 'AR', 'ARFLAGS'))
by /usr/lib64/python3.3/distutils/sysconfig.py at get_config_vars::530
526 global _config_vars
527 if _config_vars is None:
528 func = globals().get("_init_" + os.name) # -> os.name = posix
529 if func:
530 func() # -> _init_posix, populates _config_vars
by /usr/lib64/python3.3/distutils/sysconfig.py at _init_posix::439
435 g = {}
436 # load the installed Makefile:
437 try:
438 filename = get_makefile_filename() #
/usr/lib64/python3.3/config-3.3m/Makefile
439 parse_makefile(filename, g)
...
476 global _config_vars
477 _config_vars = g # -> _config_vars["SO"] = ".cpython-33m.so"
by /usr/lib64/python3.3/config-3.3m/Makefile::122
SO= .cpython-33m.so
----------
assignee: eric.araujo
components: Distutils
messages: 177979
nosy: eric.araujo, smani, tarek
priority: normal
severity: normal
status: open
title: Incorrect shared library extension on linux
type: behavior
versions: Python 3.3
_______________________________________
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue16754>
_______________________________________
_______________________________________________
Python-bugs-list mailing list
Unsubscribe:
http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
