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[Bug fortran/29621] lapack runs into infinite loop with -03
- From: "sgk at troutmask dot apl dot washington dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Oct 2006 01:40:30 -0000
- Subject: [Bug fortran/29621] lapack runs into infinite loop with -03
- References: <bug-29621-13059@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #13 from sgk at troutmask dot apl dot washington dot edu 2006-10-28 01:40 -------
Subject: Re: lapack runs into infinite loop with -03
On Sat, Oct 28, 2006 at 01:34:48AM -0000, fkar at nemesis-project dot org
wrote:
>
> I used (on three different XP boxes) the source code as provided by netlib
> http://www.netlib.org/lapack/lapack.tgz,
> the latest gfortran binaries, namely
> http://quatramaran.ens.fr/~coudert/gfortran/gfortran-windows.exe,
> posted on
> http://gcc.gnu.org/wiki/GFortranBinaries,
> and dated 2006-10-21 (mingw build), and I followed the (fairly) straightforward
> instructions given in the description. I also used g77 (included in mingw
> 3.4.2., now dropped from the gcc mainline) always ending up in the same result,
> reproducible by anyone but me, hence I do not think that this should be filed
> then as a bug.
> I appreciate your time very much.
>
Are you building slamch.f and dlamch.f with -O3 or even -O1?
Don't. These files try to determine machine values (e.g.,
epsilon). Optimization can give some really strange answers.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29621