1 From b881a79adcd4ae5ac8fe4f49d0fc77c47f777919 Mon Sep 17 00:00:00 2001
2 From: Hongxu Jia <hongxu.jia@windriver.com>
3 Date: Fri, 4 Aug 2017 11:16:14 +0800
4 Subject: [PATCH] setup.py: pass missing libraries to Extension for
7 In the following commit:
9 commit e711cafab13efc9c1fe6c5cd75826401445eb585
10 Author: Benjamin Peterson <benjamin@python.org>
11 Date: Wed Jun 11 16:44:04 2008 +0000
13 Merged revisions 64104,64117 via svnmerge from
14 svn+ssh://pythondev@svn.python.org/python/trunk
16 (see diff in setup.py)
17 It assigned libraries for multiprocessing module according
18 the host_platform, but not pass it to Extension.
20 In glibc, the following commit caused two definition of
21 sem_getvalue are different.
22 https://sourceware.org/git/?p=glibc.git;a=commit;h=042e1521c794a945edc43b5bfa7e69ad70420524
23 (see diff in nptl/sem_getvalue.c for detail)
24 `__new_sem_getvalue' is the latest sem_getvalue@@GLIBC_2.1
25 and `__old_sem_getvalue' is to compat the old version
26 sem_getvalue@GLIBC_2.0.
28 To build python for embedded Linux systems:
29 http://www.yoctoproject.org/docs/2.3.1/yocto-project-qs/yocto-project-qs.html
30 If not explicitly link to library pthread (-lpthread), it will
31 load glibc's sem_getvalue randomly at runtime.
33 Such as build python on linux x86_64 host and run the python
34 on linux x86_32 target. If not link library pthread, it caused
35 multiprocessing bounded semaphore could not work correctly.
37 >>> import multiprocessing
38 >>> pool_sema = multiprocessing.BoundedSemaphore(value=1)
39 >>> pool_sema.acquire()
41 >>> pool_sema.release()
42 Traceback (most recent call last):
43 File "<stdin>", line 1, in <module>
44 ValueError: semaphore or lock released too many times
47 And the semaphore issue also caused multiprocessing.Queue().put() hung.
49 Upstream-Status: Submitted [https://github.com/python/cpython/pull/2999]
51 Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
54 1 file changed, 5 insertions(+), 2 deletions(-)
56 diff --git a/setup.py b/setup.py
57 index b7a36a6..658ead3 100644
60 @@ -1584,8 +1584,10 @@ class PyBuildExt(build_ext):
61 elif host_platform.startswith('netbsd'):
65 - else: # Linux and other unices
66 + elif host_platform.startswith(('linux')):
68 + libraries = ['pthread']
69 + else: # Other unices
73 @@ -1603,6 +1605,7 @@ class PyBuildExt(build_ext):
75 exts.append ( Extension('_multiprocessing', multiprocessing_srcs,
76 define_macros=list(macros.items()),
77 + libraries=libraries,
78 include_dirs=["Modules/_multiprocessing"]))