gdb pretty-print python path

On some of my dev machines (freaking Ubuntu 14.04), gdb can't find the pretty print python extension.

(^q^) r
Starting program: /home/xatier/xxxxx
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Traceback (most recent call last):
  File "/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module>
    from libstdcxx.v6.printers import register_libstdcxx_printers
ImportError: No module named 'libstdcxx'

Let's print python path:


On Ubuntu 14.04
(^q^) python print(sys.path)
['/usr/share/gdb/python', '/usr/lib/python3.4', '/usr/lib/python3.4/plat-x86_64-linux-gnu', '/usr/lib/python3.4/lib-dynload', '/usr/local/lib/python3.4/dist-packages', '/usr/lib/python3/dist-packages']

On arch linux
(^q^) python print(sys.path)
['/usr/lib/../share/gcc-5.2.0/python', '/usr/share/gdb/python', '/usr/lib/python35.zip', '/usr/lib/python3.5', '/usr/lib/python3.5/plat-linux', '/usr/lib/python3.5/lib-dynload', '/usr/lib/python3.5/site-packages']


See? So basically the python scripts are under /usr/share/<gcc-ver>/python

$ ls /usr/share | grep gcc
gcc-4.8


Just add this line to your ~/.gdbinit :

python sys.path.append("/usr/share/gcc-4.8/python")


Now you are good.

(^q^) python print(sys.path)
['/usr/share/gdb/python', '/usr/lib/python3.4', '/usr/lib/python3.4/plat-x86_64-linux-gnu', '/usr/lib/python3.4/lib-dynload', '/usr/local/lib/python3.4/dist-packages', '/usr/lib/python3/dist-packages', '/usr/share/gcc-4.8/python']