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bpo-21536: On Cygwin, C extensions must be linked with libpython (GH-13549)

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It is also possible to link against a library or executable with a
statically linked libpython, but not both with the same DLL.  In fact
building a statically linked python is currently broken on Cygwin
for other (related) reasons.

The same problem applies to other POSIX-like layers over Windows
(MinGW, MSYS) but Python's build system does not seem to attempt
to support those platforms at the moment.
This commit is contained in:
E. M. Bray 2019-05-24 17:33:47 +02:00 • committed by Victor Stinner
parent 438a12dd9d
commit c994c8fc19
6 changed files with 40 additions and 26 deletions
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36
Lib/distutils/command/build_ext.py
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@ -714,20 +714,32 @@ class build_ext(Command):
# don't extend ext.libraries, it may be shared with other
# extensions, it is a reference to the original list
return ext.libraries + [pythonlib]
# On Android only the main executable and LD_PRELOADs are considered
# to be RTLD_GLOBAL, all the dependencies of the main executable
# remain RTLD_LOCAL and so the shared libraries must be linked with
# libpython when python is built with a shared python library (issue
# bpo-21536).
else:
# On Android only the main executable and LD_PRELOADs are considered
# to be RTLD_GLOBAL, all the dependencies of the main executable
# remain RTLD_LOCAL and so the shared libraries must be linked with
# libpython when python is built with a shared python library (issue
# bpo-21536).
# On Cygwin (and if required, other POSIX-like platforms based on
# Windows like MinGW) it is simply necessary that all symbols in
# shared libraries are resolved at link time.
from distutils.sysconfig import get_config_var
link_libpython = False
if get_config_var('Py_ENABLE_SHARED'):
# Either a native build on an Android device or the
# cross-compilation of Python.
if (hasattr(sys, 'getandroidapilevel') or
('_PYTHON_HOST_PLATFORM' in os.environ and
get_config_var('ANDROID_API_LEVEL') != 0)):
ldversion = get_config_var('LDVERSION')
return ext.libraries + ['python' + ldversion]
# A native build on an Android device or on Cygwin
if hasattr(sys, 'getandroidapilevel'):
link_libpython = True
elif sys.platform == 'cygwin':
link_libpython = True
elif '_PYTHON_HOST_PLATFORM' in os.environ:
# We are cross-compiling for one of the relevant platforms
if get_config_var('ANDROID_API_LEVEL') != 0:
link_libpython = True
elif get_config_var('MACHDEP') == 'cygwin':
link_libpython = True
if link_libpython:
ldversion = get_config_var('LDVERSION')
return ext.libraries + ['python' + ldversion]
return ext.libraries