Description

assignee = None
closed_at = None
created_at = <Date 2013-10-03.16:36:53.114>
labels = ['3.11', 'type-bug', '3.9', '3.10', 'docs']
title = '[doc] Embedding into a shared library fails again'
updated_at = <Date 2021-12-05.12:34:31.228>
user = 'https://bugs.python.org/rinatous'

activity = <Date 2021-12-05.12:34:31.228>
actor = 'iritkatriel'
assignee = 'docs@python'
closed = False
closed_date = None
closer = None
components = ['Documentation']
creation = <Date 2013-10-03.16:36:53.114>
creator = 'rinatous'
dependencies = []
files = []
hgrepos = []
issue_num = 19153
keywords = []
message_count = 4.0
messages = ['198900', '198945', '198961', '198962']
nosy_count = 5.0
nosy_names = ['doko', 'pitrou', 'sandro.tosi', 'docs@python', 'rinatous']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue19153'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

Activity

1. rinatous commented on Oct 3, 2013

   

   rinatousmannequin

   on Oct 3, 2013

   MannequinAuthor

   More actions

   I have same error as here described http://bugs.python.org/issue4434

   I made everythings according this article http://docs.python.org/2/extending/embedding.html#compiling-and-linking-under-unix-like-systems and more but when i try to call interpriter from C++ it fails with errors

   python_support::pre_process_payment() failed
   Traceback (most recent call last):
     File "<string>", line 1, in <module>
     File "<hidden-path>/payments/__init__.py", line 1, in <module>
       from .factory import *
     File "<hidden-path>/payments/factory.py", line 7, in <module>
       import psycopg2
     File "/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.py", line 50, in <module>
       from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
   ImportError: /usr/local/lib/python2.7/dist-packages/psycopg2/_psycopg.so: undefined symbol: PyExc_SystemError
   Error in sys.excepthook:
   Traceback (most recent call last):
     File "/usr/lib/python2.7/dist-packages/apport_python_hook.py", line 66, in apport_excepthook
       from apport.fileutils import likely_packaged, get_recent_crashes
     File "/usr/lib/python2.7/dist-packages/apport/__init__.py", line 1, in <module>
       from apport.report import Report
     File "/usr/lib/python2.7/dist-packages/apport/report.py", line 16, in <module>
       from xml.parsers.expat import ExpatError
     File "/usr/lib/python2.7/xml/parsers/expat.py", line 4, in <module>
       from pyexpat import *
   ImportError: /usr/lib/python2.7/lib-dynload/pyexpat.so: undefined symbol: _Py_ZeroStruct
   
   Original exception was:
   Traceback (most recent call last):
     File "<string>", line 1, in <module>
     File "<hidden-path>/payments/__init__.py", line 1, in <module>
       from .factory import *
     File "<hidden-path>/payments/factory.py", line 7, in <module>
       import psycopg2
     File "/usr/local/lib/python2.7/dist-packages/psycopg2/__init__.py", line 50, in <module>
       from psycopg2._psycopg import BINARY, NUMBER, STRING, DATETIME, ROWID
   ImportError: /usr/local/lib/python2.7/dist-packages/psycopg2/_psycopg.so: undefined symbol: PyExc_SystemError

   Environment
   3.2.0-54-generic-pae #82-Ubuntu (12.04)
   g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
   Boost.Python 1.48
   Python 2.7.3 (default, Sep 26 2013, 20:08:41)
   [GCC 4.6.3] on linux2

   No custom builds. Every package from ubuntu repository. Psycopg2 installed by pip

   Project is big so i can't to provide code
2. rinatous

   added

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Oct 3, 2013
3. pitrou commented on Oct 4, 2013

   

   pitrou

   on Oct 4, 2013

   Member

   More actions

   No custom builds. Every package from ubuntu repository. Psycopg2 installed by pip

   You may have to rebuild packages using the custom Python, not the system Python, since the linker options have to be different (especially the "shared" part: Ubuntu's Python is a static build, not a shared library build).

   Or perhaps you can dlopen the CPython shared library with the RTLD_GLOBAL flag. I don't know.

   I don't know if this is something that we can alleviate in Python itself.
4. rinatous commented on Oct 4, 2013

   

   rinatousmannequin

   on Oct 4, 2013

   MannequinAuthor

   More actions

   Or perhaps you can dlopen the CPython shared library with the RTLD_GLOBAL flag. I don't know.

   Yes, it works. I made it is my shared library before boost block like this

   {
     void* handle = dlopen("libpython2.7.so", RTLD_LAZY | RTLD_GLOBAL);
     // boost wrapper for python call
     dlclose(handle);
   }

   I think if nothing helps, i'll put this code into __attribute__((ctor|dtor)) functions

   Thanks a lot
5. pitrou commented on Oct 4, 2013

   

   pitrou

   on Oct 4, 2013

   Member

   More actions

   Ok, making it a documentation issue in case it deserves clarification in the docs.
6. pitrou

   added

   docsDocumentation in the Doc dirDocumentation in the Doc dir

   and removed

   stdlibStandard Library Python modules in the Lib/ directoryStandard Library Python modules in the Lib/ directory

   on Oct 4, 2013
7. pitrou

   assigned

   docspython

   on Oct 4, 2013
8. iritkatriel

   added

   3.9 (EOL)end of lifeend of life

   3.10 (EOL)end of lifeend of life

   3.11only security fixesonly security fixes

   on Dec 5, 2021
9. iritkatriel

   changed the title [-]Embedding into a shared library fails again[/-] [+][doc] Embedding into a shared library fails again[/+] on Dec 5, 2021
10. ezio-melotti

    transferred this issue fromon Apr 10, 2022

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