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]
> > 
> > > > 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

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

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