[issue38987] 3.8.0 on GNU/Linux fails to find shared library

[Christian Heimes]

Christian Heimes  added the comment:

ld.so and ldd don't use /etc/ld.so.conf to locate libraries. They use 
/etc/ld.so.cache, which is created by ldconfig from /etc/ld.so.conf. The cache 
is typically the first file opened by a dynamically linked binary.

# ls -la /usr/local/lib/libpython3.*
lrwxrwxrwx. 1 root root   19 Dec  9 16:49 /usr/local/lib/libpython3.8.so -> 
libpython3.8.so.1.0
-rwxr-xr-x. 1 root root 17356488 Dec  9 16:49 /usr/local/lib/libpython3.8.so.1.0
-rwxr-xr-x. 1 root root 7448 Dec  9 16:49 /usr/local/lib/libpython3.so
# ldd /usr/local/bin/python3.8
linux-vdso.so.1 (0x7fff499d9000)
libpython3.8.so.1.0 => not found
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x7fd1cd2f9000)
/lib64/ld-linux-x86-64.so.2 (0x7fd1cd8ec000)
# ldconfig
# ldd /usr/local/bin/python3.8
linux-vdso.so.1 (0x7ffe19d9a000)
libpython3.8.so.1.0 => /usr/local/lib/libpython3.8.so.1.0 
(0x7ff7f46f7000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x7ff7f4306000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 
(0x7ff7f40e7000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x7ff7f3ee3000)
libutil.so.1 => /lib/x86_64-linux-gnu/libutil.so.1 (0x7ff7f3ce)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x7ff7f3942000)
/lib64/ld-linux-x86-64.so.2 (0x7ff7f4ea4000)

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[issue38987] 3.8.0 on GNU/Linux fails to find shared library

[Christian Heimes]

Christian Heimes  added the comment:

On Ubuntu and other Linux distros you must run ldconfig any time you install or 
change a shared library. Otherwise the dynamic linker won't be able to locate 
the shared library. 

I'm able to confirm that python3.8 does not work prior to calling, but works 
after calling ldconfig.

# ./configure --enable-shared
# make
# make install
# python3.8
python3.8: error while loading shared libraries: libpython3.8.so.1.0: cannot 
open shared object file: No such file or directory
# ldconfig
# python3.8
Python 3.8.0 (default, Dec  9 2019, 16:36:58) 
[GCC 7.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

--
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed
type: crash -> resource usage

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[issue38987] 3.8.0 on GNU/Linux fails to find shared library

[Kevin Buchs]

Kevin Buchs  added the comment:

No, I didn’t. But I had made no changes, so it should not have needed
changing.

On Sun, Dec 8, 2019 at 4:59 PM Christian Heimes 
wrote:

>
> Christian Heimes  added the comment:
>
> Did you update the ld.so cache with ldconfig?
>
> --
> nosy: +christian.heimes
>
> ___
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> 
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>

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[issue38987] 3.8.0 on GNU/Linux fails to find shared library

[Christian Heimes]

Christian Heimes  added the comment:

Did you update the ld.so cache with ldconfig?

--
nosy: +christian.heimes

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[issue38987] 3.8.0 on GNU/Linux fails to find shared library

[Ned Deily]

Change by Ned Deily :


--
nosy: +doko

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[issue38987] 3.8.0 on GNU/Linux fails to find shared library

[Kevin Buchs]

New submission from Kevin Buchs :

I just downloaded Python 3.8.0 and built (from source) on Ubuntu 18.04. I used 
these options to configure:

  ./configure --enable-shared --enable-ipv6 --enable-optimizations

The shared library gets installed into /usr/local/lib:

  find / -type f -name libpython3.8.so.1.0
  /usr/local/src/Python-3.8.0/libpython3.8.so.1.0
  /usr/local/lib/libpython3.8.so.1.0
  
/usr/local/lib is defined as a path to search for shared libraries: 

  # /etc/ld.so.conf loads all /etc/ld.so.conf.d/*.conf
  grep /usr/local  /etc/ld.so.conf.d/*.conf
  /etc/ld.so.conf.d/i386-linux-gnu.conf:/usr/local/lib/i386-linux-gnu
  /etc/ld.so.conf.d/i386-linux-gnu.conf:/usr/local/lib/i686-linux-gnu
  /etc/ld.so.conf.d/libc.conf:/usr/local/lib
  /etc/ld.so.conf.d/x86_64-linux-gnu.conf:/usr/local/lib/x86_64-linux-gnu

But, the python executable is unable to find it:
  /usr/local/bin/python3.8
  /usr/local/bin/python3.8: error while loading shared libraries: 
libpython3.8.so.1.0: cannot open shared object file: No such file
or directory

--
components: Installation
messages: 357924
nosy: buchs
priority: normal
severity: normal
status: open
title: 3.8.0 on GNU/Linux fails to find shared library
type: crash
versions: Python 3.8

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