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Date:	Mon, 13 Aug 2018 10:03:11 +0200
From:	Houder <houder AT xs4all DOT nl>
To:	cygwin AT cygwin DOT com
Subject:	Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.11.0-0.1
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On 2018-08-10 14:43, Houder wrote:
> On Fri, 10 Aug 2018 13:42:54, Corinna Vinschen wrote:
> [snip]
> 
>> > Note: the following line must be changed in STC-FENV.c (the STC that was
>> > attached to the bug report -- the last one above).
>> >
>> > from:
>> > const int xxx =3D 0x3d; // FE_ALL_EXCEPT on Linux, i.e. the denormal-...
>> >                         // exception is excluded on Linux
>> >
>> > to:
>> > const int xxx =3D 0x3f; // Cygwin allows the denormal-operand exception;
>> >                         // Linux (Andreas Jaeger) does not.
>> >                         // This exception is not defined by the IEEE 754
>> >                         // standard (Floating-Point Arithmetic)
>> 
>> Shall we change that?  A patch would be nice. ;)
> 
> That is possible ...
> 
> As on Linux, the denormal-operand exception will always be masked after 
> this
> change ... (both in the default env. and in the "nomask" env.)
> 
> Meaning that, after this change, this exception can * no longer * be 
> enabled
> through the API of fenv.h
> 
> Objections? Anyone?
> 
> The modication would require changing:
> 
> winsup/cygwin/fenv.cc (_feinitialise() )
> winsup/cygwin/include/fenv.h (FE_ALL_EXCEPT)
> 
> /usr/include/fenv.h (which is a copy of the above, I am guessing ?????)

Stupid question:

Does the modification of winsup/cygwin/include/fenv.h "automatically" 
propogate
to /usr/include/fenv.h

Said differently, does "your" machinery (build) take care of that?

Regards,
Henri

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