Comment # 18 on bug 1201107 from Jan Engelhardt

implementation in home:jengelh:branches:windows:mingw:win32

$ rpm -qlvp mingw32-libHX-debug-4.6-0.noarch.rpm
-rwxr-xr-x    1 root     root                   489989 Jul 22 00:52
/usr/i686-w64-mingw32/sys-root/mingw/bin/libHX-32.dll.debug
drwxr-xr-x    2 root     root                        0 Jul 22 00:52
/usr/i686-w64-mingw32/sys-root/mingw/src
drwxr-xr-x    2 root     root                        0 Jul 22 00:52
/usr/i686-w64-mingw32/sys-root/mingw/src/debug
drwxr-xr-x    2 root     root                        0 Jul 22 00:52
/usr/i686-w64-mingw32/sys-root/mingw/src/debug/libHX-4.6
drwxr-xr-x    2 root     root                        0 Jul 22 00:52
/usr/i686-w64-mingw32/sys-root/mingw/src/debug/libHX-4.6/src
-rw-r--r--    1 root     root                     3940 Jul 22 00:52
/usr/i686-w64-mingw32/sys-root/mingw/src/debug/libHX-4.6/src/deque.c
...

so we get source files again, but I have not tried if gdb is happy enough with
that.