iostream exceptions uncaught with CYGWIN GCC/7.3.0

[Lavrentiev, Anton (NIH/NLM/NCBI) [C] via cygwin]

> Cygwin GCC is configured and built with the old C++ ABI, I'm guess that's the problem?

The problem is that it does not work correctly because G++ and its run-time are not consistent.

GCC doc says version 7.x uses new ABI by default, so I'd guess that's the C++ stdlib which was built with the old ABI -- i.e. the other way around.

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