LDC compatibility

[hmmdyl]

LDC for the moment is incompatible with a GCC C/C++ backend. The cause of the issue is error/exception handling.

I will need to write glue code to accept LDC's compiler generated exception-code and make it interact with GCC's (not GDC!!) exception code.

[hmmdyl]

This is LDC's exception handling implementation and you'll notice that it is incompatible with our GDC-based exception handling. For refence, this is GDC's exception handling code.