The file gcc-4.3.0-20080502-mingw32-alpha-notes.txt contains the following:
NEW FEATURES SINCE MINGW GCC 3.4
Windows-specific:
-Shared libgcc: If all modules are linked with -shared-libgcc,
exceptions
can be thrown across DLL boundaries.
-Shared libstdc++: Add -lstdc++_s to your link flags to link against a
DLL
version of libstdc++.
-Zero cost exceptions: New exception model Dwarf only has performance
penalty when being thrown. The old model, SJLJ, is no longer available.
So perhaps this is fixed in 4.3?
As for the dead links in the original bug report text; the legal info
about a shared libgcc/libstdc++ can be found at:
http://web.archive.org/web/20071030200638/http://www.mingw.org/MinGWiki/index.php/SharedLibgccLegal
The links to the information for creating a shared libstdc++ from
libstdc++.a are broken, but steps detailed at this address work for me
(at least, they result in a libstdc++.dll file, I don't know if you also
have to do the same for libgcc, and whether that would work if you then
linked against it):
http://www.nabble.com/Re%3A-Libstdc%2B%2B.dll-impossible-for-a-GPL-project-because-of--exception-problems-%28contains-simple-testcase%29-p3121046.html
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Sam Morris
https://robots.org.uk/
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