SHA1 was correct.
When I checked where objdump was, however, I found it in two places: my separate MSYS installation, and the strawberry one. Once I removed all of the MINGW stuff from the path, strawberry no longer had any trouble compiling XS stuff. Maybe I had a wrong version of MINGW or something; either way, I'm happy it works now. Thanks!
in reply to Re^5: Can't compile XS code
in thread Can't compile XS code