I see that other people are running into issues with the Python 2.7 dependency of the GDB bundled with 11.2, but I'm having trouble starting it even with Python 2.7 installed.
I've installed on Windows 10 using the official installer, gcc-arm-11.2-2022.02-mingw-w64-i686-arm-none-eabi.exe. I have Python 2.7 first in my PATH, so python --version shows Python 2.7.15. There is no PYTHONPATH or PYTHON_HOME environment variable set.
gcc-arm-11.2-2022.02-mingw-w64-i686-arm-none-eabi.exe
python --version
Python 2.7.15
PYTHONPATH
PYTHON_HOME
When I try to start GDB with no arguments by running .\arm-none-eabi-gdb from the installation's bin directory, it prints ImportError: No module named site and exits. No arguments seem to have any effect or produce any useful debugging info. Curiously, on my other machine (also running Windows 10, same environment settings, and same Python 2 version), GDB exits immediately with no output.
.\arm-none-eabi-gdb
bin
ImportError: No module named site
What can I do to further troubleshoot this?
Update: I found that the problem, on both machines, was that it needed the 32-bit version of Python. I finally had the thought of searching through the install tree to find share\doc\arm-none-eabi\readme.txt, which mentioned this requirement.
share\doc\arm-none-eabi\readme.txt
The readme feels a bit buried, since I couldn't find it on the toolchain page, and the installer doesn't display it even with the box checked. GDB itself should have produced some sort of useful error message, which I'm guessing should be reported upstream.