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fnstenv MUST be followed by fldenv in fegetenv(), as the former disables all exceptions in the x87 FPU, which is not appropriate here (fegetenv() ). fldenv after fnstenv should reload the x87 FPU w/ the configuration that was saved by fnstenv, i.e. a configuration that might have exceptions enabled. Note: x86_64 uses SSE for floating-point, not the x87 FPU. However, because feraiseexcept() attempts to provoke an exception using the x87 FPU, the bug in fegetenv() will make this attempt futile here (x86_64). Note: WoW uses the x87 FPU for floating-point, not SSE. Here anything that would normally result in triggering an exception, not only feraiseexcept(), will not be able to, as result of the bug in fegetenv().
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