Configure GDB pretty printer for Msys2

From Code::Blocks

This is my way to use gdb python pretty printer for the libstdcxx under msys2. Suppose you use 64bit gcc compiler. My msys2 is installed under F:\msys64

In the Menu->Settings->Debugger settings. Open the debugger plugin setting dialog.

Then, in the "Executable path" field, select "F:\msys64\mingw64\bin\gdb.exe" in the "Debugger initialization commands" field, put the following text in the edit control. 

source F:\msys64\mingw64\etc\gdbinit

I see that I have to modify the file "F:\msys64\mingw64\etc\gdbinit" file: below is the original code 

python
import sys
sys.path.insert(0, sys.path[0] + '/../../gcc-9.2.0/python')
from libstdcxx.v6.printers import register_libstdcxx_printers
end

But you have to add one line before the "end" statement like below to let the register_libstdcxx_printers function get executed. 

python
import sys
sys.path.insert(0, sys.path[0] + '/../../gcc-9.2.0/python')
from libstdcxx.v6.printers import register_libstdcxx_printers
register_libstdcxx_printers(None)
end

BTW: It is the same thing to add the python pretty printer for wxWidgets. You can use this file: 

https://github.com/wxWidgets/wxWidgets/blob/master/misc/gdb/print.py


Use predefined macros for the paths

Under Code::Blocks, you can used some predefined path macros.

For example, you don't need to write 

source F:\msys64\mingw64\etc\gdbinit

Instead, you can use this: 

source $(TARGET_COMPILER_DIR)etc\gdbinit

Since you have already defined the compiler master path in the "Menu->Settings->Compiler->Toolchain executables" as "F:\msys2\mingw64", so the second way is more portable. Also, to mention gdb.exe, you can use 

$(TARGET_COMPILER_DIR)bin\gdb.exe

Add the pretty printer for wxWidgets

Here is the full gdbinit content when using latest gcc under msys2/mingw64 

python
import sys
sys.path.insert(0, sys.path[0] + '/../../gcc-12.2.0/python')
from libstdcxx.v6.printers import register_libstdcxx_printers
register_libstdcxx_printers (None)

sys.path.insert(0, sys.path[0] + '/../../../etc')
import wxprint

end

Note that the two lines were added to the original gdbinit(note once you use pacman to upgrade you gcc, this gdbinit file will get overwritten) 

sys.path.insert(0, sys.path[0] + '/../../../etc')
import wxprint

Here, the "wxprint" is a file named "wxprint.py", which is just the same file as: https://github.com/wxWidgets/wxWidgets/blob/master/misc/gdb/print.py, I just put this "wxprint.py" in the same folder as the gdbinit file.


Useful Links

Debugger: use gdb python pretty printer for the libstdcxx under msys2

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