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https://bugzilla.redhat.com/show_bug.cgi?id=489100
--- Comment #5 from Kevin Kofler kevin@tigcc.ticalc.org 2009-03-07 21:47:46 EDT ---
Do you know about the (to me) "mysterious" DLL that gcc 4.4 installs? /usr/i686-pc-mingw32/sys-root/mingw/bin/libgcc_s_sjlj-1.dll Does it help, hinder or is it irrelevant?
That's a shared libgcc (plus, it's using sjlj, not DWARF2 which currently doesn't work across DLLs unless this was solved somehow recently), so it should fix the issue.
Note that the bug report was about 4.3.2, not 4.4, so it's quite possible 4.4 fixes it.
One thing to check is whether static or shared libgcc is the default. If it's static, you'll also need to compile both the DLL and the executable with -shared-libgcc to make it work.