seg fault

[Benjaminmar8]

Dear All,
I managed to compile the but_velodyne_lib and but_velodyne_ros based on #3
Now I am trying to test the program and I got a seg fault. I also run the program with gdb (rosrun --prefix 'gdb -ex run --args' but_velodyne_ros but_velodyne_ros_node ) and I got the output as shown below. Is there anything I did wrongly? Thanks a lot for the help!

GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1
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Reading symbols from /home/vc1/catkin_ws/devel/lib/but_velodyne_ros/but_velodyne_ros_node...(no debugging symbols found)...done.
Starting program: /home/vc1/catkin_ws/devel/lib/but_velodyne_ros/but_velodyne_ros_node
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
Traceback (most recent call last):
File "/usr/share/gdb/auto-load/usr/lib/i386-linux-gnu/libstdc++.so.6.0.19-gdb.py", line 63, in
from libstdcxx.v6.printers import register_libstdcxx_printers
ImportError: No module named 'libstdcxx'

Program received signal SIGSEGV, Segmentation fault.
__strcmp_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:241
241 ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S: No such file or directory.
(gdb) continue
Continuing.

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.

[martin-velas]

Hi - this library is ROS independent. Please, take a look and try to run the script demo.sh to find out, if the problem is related to the library or the ROS implementation. From this error output I can not tell anything.

[Benjaminmar8]

I think my issue is that my cmake could not find the module config file for but_velodyne_lib. Quick question, how do you let cmake look for the but_velodyne_lib module config file, suppose I have compiled the but_velodyne_lib at my home directory? Thanks a lot.

[ompugao]

I think my issue is that my cmake could not find the module config file for but_velodyne_lib.

Nope

Quick question, how do you let cmake look for the but_velodyne_lib module config file, suppose I have compiled the but_velodyne_lib at my home directory?

installpath=$HOME/install
cd path/to/but_velodyne_lib
mkdir build; cd build
cmake .. -DCMAKE_INSTALL_PREFIX=$installpath
make install
echo export CMAKE_PREFIX_PATH='$CMAKE_PREFIX_PATH':"$installpath" | tee >> $HOME/.bashrc
exec $SHELL

ImportError: No module named 'libstdcxx'

mkdir -p $HOME/.gdb
svn co https://gcc.gnu.org/svn/gcc/trunk/libstdc++-v3/python ~/.gdb/python
cat > $HOME/.gdbinit
python
import sys
import os
sys.path.insert(0, os.path.join(os.environ['HOME'],'.gdb/python/'))
sys.path.append(os.path.join(os.environ['HOME'],'.gdb/python/libstdcxx/v6/'))
from libstdcxx.v6.printers import register_libstdcxx_printers
#register_libstdcxx_printers (None)
end
<C-d>

Program received signal SIGSEGV, Segmentation fault.

try backtrace on gdb

[Benjaminmar8]

This is what I get after I entered backtrace on gdb:
(gdb) backtrace
#0 __strcmp_ssse3 () at ../sysdeps/i386/i686/multiarch/strcmp-ssse3.S:241
#1 0xaef0d023 in QMetaType::registerNormalizedType(QByteArray const&, void ()(void), void* ()(void const), void ()(void), void* ()(void, void const_), int, QFlagsQMetaType::TypeFlag, QMetaObject const_) ()
from /usr/lib/i386-linux-gnu/libQt5Core.so.5
#2 0xae8ddd48 in ?? () from /usr/lib/i386-linux-gnu/libQt5Gui.so.5
#3 0xb7fecd77 in call_init (l=, argc=argc@entry=1,
argv=argv@entry=0xbfffe9b4, env=env@entry=0xbfffe9bc) at dl-init.c:78
#4 0xb7fece64 in call_init (env=0xbfffe9bc, argv=0xbfffe9b4, argc=1,
l=) at dl-init.c:36
#5 _dl_init (main_map=0xb7fff938, argc=1, argv=0xbfffe9b4, env=0xbfffe9bc)
at dl-init.c:126
#6 0xb7fdf10f in _dl_start_user () from /lib/ld-linux.so.2

Any idea what went wrong? Thanks!