debug gdb and ROS

edit

I have been trying to debug my rosnode with gdb because I am getting a segmentation fault. My package name is renv and the executable inside it is names env

I can run rosrun renv env --env 1 and it works. When I do rosrun renv env --env 2 it gives me a SegFault.

I tried:

gdb --args rosrun renv env --env 2 and gdb says rosrun is not executable (makes sense as it's a shell script)

gdb --args renv env --env 2 and gdb says renv not found

gdb --args env --env 2 and gdb gets confused and trued running /usr/bin/env

I have enabled debugging symbols in CMake using

if(MSVC)  
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zi")  
else()  
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g")  
endif()

And I find a lot of answers pointing to Roslaunch nodes and gdb + valgrind ... and It's difficult for me to understand that ... I think it says to use gdb --args for the gdb part - But I don't know what to put after that :P