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Mingw-w64 exception handling configuration


I see that the default EH behavior for a biarch mingw-w64 target GCC is to use SJLJ for the 32-bit multilib and SEH for the 64-bit one, but that there are #errors in cygming.h and mingw32.h that prevent you from configuring a biarch build with --disable-sjlj-exceptions to use DWARF-2 and SEH, respectively. Is there a deep reason for this, or is this just a case where nobody updated the configuration logic after SEH was implemented? I understand that before that, you had to use SJLJ for 64-bit targets because the DWARF-2 support is restricted to 32-bit targets, so it was completely reasonable to error out.

The reason I'm asking is, I have a third-party 32-bit library that was built for DWARF-2 EH....

-Sandra


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