Re: was: bad datatypes time and timestamp - wrong gcc option

Thomas Lockhart wrote:
> > you were right about the wrong compiler-options: it was not the -O3 but
> > the -ffast-math option that made the wrong rounding (and other stuff) ;-)
> > I compiled a ManDrake source RPM that used the default rpmrc in
> > /usr/lib/rpm/rpmrc, in which the optflags are set incorrectly:

> > ... -O3 ... -ffast-math ...

> > But this behaviour may be found in any distribution based onto the RedHat
> > system, at least when utilizing the RPM-utility unchanged. My RPM is
> > version 3.0.3 here.

On my RedHat 6.2 buildbox, I get -02 -m486 -fno_strength_reduce (using
the very useful 'rpm --showrc|grep optflags' -- the optflags macro gets
placed in the RPM_OPT_FLAGS envvar during rpm startup) -- sounds like a
Mandrakeism.

> > A hot fix for the SPEC-file would be, to eliminate that option by
> > RPM_OPT_FLAGS=`echo $RPM_OPT_FLAGS | sed -e "s/-ffast-math//"`

> Thanks for tracking this down. I'll look at my RPM setup for
> Mandrake-7.1 to confirm the behavior, and then perhaps Lamar can
> introduce an appropriate fix to the canonical spec file.

I will look into doing this, although Mandrake really should fix this,
if it is not recommended by the gcc people to combine -O stuff and
-ffast_math.

--
Lamar Owen
WGCR Internet Radio
1 Peter 4:11