Debugger for C++ (specifically GCC).
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If you normally run:
you now run:
This loads the executable but does not run it. At the gdb prompt set your breakpoints (break class::functionName or break filename.cpp:linenumber), then start the program (run).
Symbols not found
If symbols are not found, but you are sure they should be, consider clearing the build folder and re-running CMake/make.