undefined symbol: PyExc_SystemError #81

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1. jenner commented on Nov 8, 2019

   

   jenner

   on Nov 8, 2019

   Author

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   Found the problem: in ecbdcf1 print(distutils.sysconfig.get_config_var("LDLIBRARY")) yields libpython3.7m.so, which is not a valid linker argument. Replacing it with print(distutils.sysconfig.get_config_var("BLDLIBRARY")) works though:

   ~# python3.7 -c 'import distutils.sysconfig; print(distutils.sysconfig.get_config_var("BLDLIBRARY"))'
   -lpython3.7m
   

   I guess the config var depends on the platform.

   👍React with 👍1Reacted by unixo
2. grisha

   closed this as completedon Jan 9, 2020
3. grisha

   reopened this on Jan 12, 2020
4. ewah commented on Feb 10, 2020

   

   ewah

   on Feb 10, 2020

   Last edited by ewah

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   BLDLIBRARY isn't consistent depending on the how the original python got built.

   > python  -m sysconfig | grep BLDLIB
   	BLDLIBRARY = "-L. -lpython2.7"
   

   > python  -m sysconfig | grep BLDLIB
   	BLDLIBRARY = ""
   

   > python -m sysconfig | grep BLDLIB
   	BLDLIBRARY = "libpython3.8.a"
   

   ---

   locally i've reverted the config code back to pre-ecbdcf17884551b823fcef12cd5bd91103bde1fc (nov 7, 2019)

   +    if test "$PyMAJVERSION" -eq "3"; then
   +        LDLIBS1="-lpython${PyMAJVERSION}"
   +    else
   +        LDLIBS1="-lpython${PyVERSION}"
   +    fi
   -    LDLIBS1=`${PYTHON_BIN} -c 'import distutils.sysconfig;\
   -        print(distutils.sysconfig.get_config_var("LDLIBRARY"))'`
   
5. thkatsou commented on Dec 2, 2020

   

   thkatsou

   on Dec 2, 2020

   Last edited by thkatsou

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   trying to compile mod-python on ubuntu 20.10 against python 2.7 .
   Compilation and installation goes ok but apache2 does not start with same error.

   apachectl configtest
   apache2: Syntax error on line 146 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/python.load: Cannot load /usr/lib/apache2/modules/mod_python.so into server: /usr/lib/apache2/modules/mod_python.so: undefined symbol: PyExc_SystemError
   Action 'configtest' failed.
   The Apache error log may have more information.

   tried all of the patches on makefile.in still no luck.

   update: this modification on configure script worked ana apache2 started.
   0e436f1
   now I am facing
   ImportError: Import by filename is not supported.
6. diegobill commented on Apr 22, 2024

   

   diegobill

   on Apr 22, 2024

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   any update from this error? I am still seeing on Docker in Ubuntu 16.04:

   FROM python:2.7.18-slim
   
   # Install packages
   RUN apt-get -yqq update && \
       apt-get -yqq install mercurial git vim apache2 apache2-dev libapache2-mod-python openssl libmariadb-dev fonts-freefont-ttf libssl-dev cron logrotate lynx htop zabbix-agent && \
       apt-get clean
   
   WORKDIR /usr/local/src
   RUN git clone git+https://github.com/grisha/mod_python.git@e7ec956eaeba9f75e33f5d0036a6699ac3f0d816
   WORKDIR /usr/local/src/mod_python
   COPY patches/patch-Py_Initialize.txt /tmp
   RUN LIBS="-lpython2.7" ./configure && \
       # configure gets the libpython2.7.so link argument wrong, so fix it
       sed -i.bak 's/libpython2.7.so/-lpython2.7/g' /usr/local/src/mod_python/src/Makefile && \
       patch -p1 < /tmp/patch-Py_Initialize.txt && \
       LIBS="-lpython2.7" make && \
       make install