$ ldd.exe lib/auto/Win32/Win32.xs.dll
        ntdll.dll => /c/Windows/SYSTEM32/ntdll.dll (0x76db0000)
        kernel32.dll => /c/Windows/system32/kernel32.dll (0x76c90000)
        KERNELBASE.dll => /c/Windows/system32/KERNELBASE.dll (0x7fefc9d0000)
        ??? => ??? (0x64cc0000)

##</code><code>##

gendef -a mydll.dll
then, using the generated mydll.def:
dlltool --kill-at --input-def mydll.def --output-lib libmydll.a