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Some debuggers support macro expansion when you use -g3 ", while -g does not include this extra information. The broader answer is that gcc supports four levels of debug information, from -g0 (debug information disabled) through -g3 (maximum debug information). Specifying -g is equivalent to -g2. Curiously, the gcc docs say little about what ...
Scripting is a nice GDB feature. First you set a breakpoint, like: b someFunction\n. Then you run command: commands\n. GDB will ask for commands for that breakpoint. Common scenario is to print some value and then continue, so you will enter: p someVar\n continue\n. To end the script press: Ctrl-D.
In short, the following commands are all you need to get started using gdb: break file:lineno - sets a breakpoint in the file at lineno. set args - sets the command line arguments. run - executes the debugged program with the given command line arguments. next (n) and step (s) - step program and step program until it.
I guess the best solution is to update gdb to a newer version, by compiling it from the official repository. Another solution would be to pre-compile the code manually and inject it manually within gdb, as explained here. Sounds fun but not sure this is the easy way! On Ubuntu 19.04 GDB 8.2.91, I can use simple compiles such as compile code i ...
It reads an external file for compiler flags. For gdb, I include the neccisary -g flag. This works for me to debug via the text interface. However, this text interface is becoming increasingly frustrating to use compared to a IDE, and I know that Visual Studio uses gdb as a backend to debug C++ files by default.
51. The first step is to compile your program with -g to include debugging information within the executable: g++ -g -o myprog.exe mycode.cpp. Then the program can be loaded into gdb: gdb myprog.exe. A few commands to get you started: break main will cause the debugger to break when main is called.
To get useful information you also need to compile with the -g flag. Whenever you get the message: Segmentation fault (core dumped) a core file is written into your current directory. And you can examine it with the command. gdb your_program core_file. The file contains the state of the memory when the program crashed.
Name it to some name e.g. your_name.conf. 2) Add a ~/.gdbinit file to home directory if you don't have one. 3) Add a line source /your/path/your_name.conf to your ~/.gdbinit. 4) Restart gdb. Try pvector. You can find help information with commands like help pvector. e.g. pvector vec 5 # Prints element[5] in vec.
The solution was to use gdb-python (on MSYS; on Linux typically gdb comes with Python built-in already?), hook backtrace, use . python stack_trace = gdb.execute('backtrace', False, True') Then process stack_trace with Python's regexes, and print them out. Bold and other colours are achieved by a function like this:
gcc and g ++ are both GNU compiler. They both compile c and c++. The difference is for *.c files gcc treats it as a c program, and g++ sees it as a c ++ program. *.cpp files are considered to be c ++ programs. c++ is a super set of c and the syntax is more strict, so be careful about the suffix.