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The default implementation of the fenv.h methods return -EOPNOTSUP. Some of these have implementations appropriate for soft-float. The intention of the new fenv.h is that it be portable and that architectures provide their own implementation of sys/fenv.h.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Cygwin documentation is available on the net at https://cygwin.com You might especially be interested in https://cygwin.com/faq/faq.html#faq.programming.building-cygwin