[Bug fortran/47692] Numeric inaccuracy reported in testing lapack-3.3.0 BLAS module

["sgk at troutmask dot apl.washington.edu" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47692

--- Comment #8 from Steve Kargl <sgk at troutmask dot apl.washington.edu> 2011-02-11 20:23:14 UTC ---
On Fri, Feb 11, 2011 at 07:56:05PM +0000, jrt at worldlinc dot net wrote:
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47692
> 
> --- Comment #6 from John T <jrt at worldlinc dot net> 2011-02-11 19:56:02 UTC ---
> I built the reference BLAS included with Lapack from source. I just got the
> results from blas_testing using gcc-4.4.5 and results good again. I don't know
> where to find the raw results from lapack and blas testing. Should there be an
> ieee flag in compiler settings? Any flags on how to round?
> 
> My flags were:
> #
> FORTRAN  = gfortran -fimplicit-none -g
> OPTS     = -O3
> DRVOPTS  = $(OPTS)
> NOOPT    = -g -O0
> LOADER   = gfortran -g
> LOADOPTS =
> 

I just built the blas included with lapack-3.3.0 with
-O3 of x86_64-*-freebsd with 4.5.3 and 4.6.0 (a fews
old version).  There were no errors.  Can you rebuild
with -O and see if you have problems?  If you have
problems with -O, can you then use -O0 -ffloat-store?