I use the MSYS2 mingw-w64-x86_64-toolchain group to build my code and stack traces would be more useful if I had debug symbols for the standard library libgcc.
I have searched on the package manager and Google, but can't work out how to get debugging symbols for the standard library. I would expect a mingw-w64-x86_64-gcc-devel or mingw-w64-x86_64-gcc-dbgsym package.
Would I have to compile gcc from source?
Yes you need build GCC yourself with debug enabled. MSYS2 provide only release builds