解决方法:http://stackoverflow.com/questions/31062010/ubuntu-14-04-gcc-4-8-4-gdb-pretty-printing-doesnt-work-because-of-python-issu
warning: File "/usr/local/lib64/libstdc++.so.6.0.21-gdb.py" auto-loading has been declined by your `auto-load safe-path' set to "$debugdir:$datadir/auto-load". To enable execution of this file add add-auto-load-safe-path /usr/local/lib64/libstdc++.so.6.0.21-gdb.py line to your configuration file "/root/.gdbinit". To completely disable this security protection add set auto-load safe-path / line to your configuration file "/root/.gdbinit".
$vi ~/.gdbinit
add-auto-load-safe-path /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py
set auto-load safe-path /
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Traceback (most recent call last): File "/usr/share/gdb/auto-load/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in <module> from libstdcxx.v6.printers import register_libstdcxx_printers ImportError: No module named 'libstdcxx'$vi ~/.gdbinit
add-auto-load-safe-path /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.19-gdb.py
set auto-load safe-path /
python sys.path.append("/usr/share/gcc-4.8/python")
