I might need a bit of help here.
./configure --cross-prefix=x86_64-w64-mingw32- --target-list=ppc-softmmu --enable-gtk --enable-sdl --enable-debug
C:\qemu-debugging>gdb --args c:\qemu-master-msys2\qemu-system-ppc.exe -L c:\qemu-master-msys2\pc-bios -boot c -m 256 -M mac99,via=pmu -hda c:\Mac-disks\9.2.img
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Reading symbols from c:\qemu-master-msys2\qemu-system-ppc.exe...done.
(gdb) run
Starting program: c:\qemu-master-msys2\qemu-system-ppc.exe -L c:\qemu-master-msys2\pc-bios -boot c -m 256 -M "mac99,via=pmu" -hda c:\Mac-disks\9.2.img
[New Thread 3076.0x1384]
[New Thread 3076.0x9a0]
[New Thread 3076.0x3074]
[New Thread 3076.0x3014]
[Thread 3076.0x9a0 exited with code 0]
[Thread 3076.0x3014 exited with code 0]
[Thread 3076.0x3074 exited with code 0]
[Inferior 1 (process 3076) exited with code 035610000]
(gdb) thread apply all bt full
I get no output.