Problems installing Python 3 with --enable-shared

Question

Problem

I\'m trying to install Python 3 with the --enable-shared option. Installation \"succeeds\" but the resulting Python is not runnable. Trying to run Python a

Answer 1

As explained in the mod_wsgi documentation, set LD_RUN_PATH at the time of installing mod_wsgi.

• http://modwsgi.readthedocs.io/en/develop/user-guides/installation-issues.html?highlight=ld_run_path#unable-to-find-python-shared-library

Answer 2

I've repeated your steps on CentOS7 and get something similar:

$ /tmp/py3/bin/python3
/tmp/py3/bin/python3: error while loading shared libraries: libpython3.5m.so.1.0: cannot open shared object file: No such file or directory

If you look at the linking of python, it isn't providing a full path to the library:

$ ldd /tmp/py3/bin/python3
    linux-vdso.so.1 =>  (0x00007fff47ba5000)
    libpython3.5m.so.1.0 => not found
    libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fdfaa32e000)
    libdl.so.2 => /lib64/libdl.so.2 (0x00007fdfaa12a000)
    libutil.so.1 => /lib64/libutil.so.1 (0x00007fdfa9f27000)
    libm.so.6 => /lib64/libm.so.6 (0x00007fdfa9c24000)
    libc.so.6 => /lib64/libc.so.6 (0x00007fdfa9862000)
    /lib64/ld-linux-x86-64.so.2 (0x000055e85eac5000)

For some reason, the Python build process isn't adding -rpath to the link line, which would "add a directory to the runtime library search path."

If you explicitly set your library path, it will work:

$ LD_LIBRARY_PATH=/tmp/py3/lib/ /tmp/py3/bin/python3
Python 3.5.1 (default, Jun 10 2016, 14:54:59) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-4)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 

So now it becomes a question as to whether you want to:

• set LD_LIBRARY_PATH globally on your system
• Edit /etc/ld.so.conf (or /etc/ld.so.conf.d/*)
• Use chrpath to change the embedded path
• export LD_RUN_PATH={prefix}/lib before you run configure and make (Where {prefix} is what you passed to --prefix. You used the wrong path.)