[GCC] C++ program calling std::getline() crashes with certain compilation flags

[TANNHAUSER Falk]

This problem goes away when updating Cygwin x86_64 from 2.8.1 to 2.8.2 ; same for this one:
https://cygwin.com/ml/cygwin/2017-07/msg00088.html "g++ std::map initializing raises segmentation fault."

Falk
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