A test version of GMP is available that removes the foillowing new
feature of the previous 6.1.0-1 release:
Speedup for Intel Broadwell and Skylake though assembly code making
use of new ADX instructions.
Based on reports on the Cygwin mailing list I suspect that this change
might be responsible for the problems with GNU compilers. After manual
installation in setup, please feed back on the mailing list if it solves
the problems on Broadwell/Skylake and still works correctly everywhere
else.
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