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Date: Mon, 13 Aug 2018 10:23:27 +0200
From: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] TEST RELEASE: Cygwin 2.11.0-0.1
Message-ID: <20180813082327.GI3747@calimero.vinschen.de>
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On Aug 13 10:03, Houder wrote:
> On 2018-08-10 14:43, Houder wrote:
> > On Fri, 10 Aug 2018 13:42:54, Corinna Vinschen wrote:
> > [snip]
> >=20
> > > > Note: the following line must be changed in STC-FENV.c (the STC tha=
t was
> > > > attached to the bug report -- the last one above).
> > > >
> > > > from:
> > > > const int xxx =3D3D 0x3d; // FE_ALL_EXCEPT on Linux, i.e. the denor=
mal-...
> > > >                         // exception is excluded on Linux
> > > >
> > > > to:
> > > > const int xxx =3D3D 0x3f; // Cygwin allows the denormal-operand exc=
eption;
> > > >                         // Linux (Andreas Jaeger) does not.
> > > >                         // This exception is not defined by the IEE=
E 754
> > > >                         // standard (Floating-Point Arithmetic)
> > >=20
> > > Shall we change that?  A patch would be nice. ;)
> >=20
> > That is possible ...
> >=20
> > As on Linux, the denormal-operand exception will always be masked after
> > this
> > change ... (both in the default env. and in the "nomask" env.)
> >=20
> > Meaning that, after this change, this exception can * no longer * be
> > enabled
> > through the API of fenv.h
> >=20
> > Objections? Anyone?
> >=20
> > The modication would require changing:
> >=20
> > winsup/cygwin/fenv.cc (_feinitialise() )
> > winsup/cygwin/include/fenv.h (FE_ALL_EXCEPT)
> >=20
> > /usr/include/fenv.h (which is a copy of the above, I am guessing ?????)
>=20
> Stupid question:
>=20
> Does the modification of winsup/cygwin/include/fenv.h "automatically"
> propogate
> to /usr/include/fenv.h

Yes, `make install' copies the files where they belong, just usually
not to /usr/include/fenv.h but to ${INSTALL_DIR}/usr/include/fenv.h
for later packaging.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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