"illegal instruction" is a compiler bug, right?

[Rex Dieter]

Quentin Spencer wrote:
> I just got a report from a user of the Octave RPM on FC4 that he got a
> crash due to an illegal instruction on an old AMD K6-3. I was able to
> duplicate this on a Pentium 233 (yes, I still have one), but not on my
> Centrino laptop. This shouldn't happen, right? The configure command
> from the spec file is:
> 
> CXXFLAGS="$RPM_OPT_FLAGS -D_GNU_SOURCE" ./configure \
>        --enable-shared=yes --enable-lite-kernel --enable-static=no \
>        --prefix=%{_prefix} --infodir=%{_infodir} --libdir=%{_libdir}
> 
> This should produce something that runs on an i386, right?

Not right.

By not using %configure, and manually using ./configure, you've built a
binary that possibly optimizes for the build-host, though $RPM_OPT_FLAGS
*should* avoid that problem.  NOTE: You only set CXXFLAGS, but not
CFLAGS or FFLAGS (like what %configure does).

Is there a reason you didn't use the %configure macro?

-- Rex