Re: -ffast-math option at compling octave in FreeBSD ports ?

[John W. Eaton]

On  8-Dec-2008, Tatsuro MATSUOKA wrote:

| To:address@hidden, address@hidden
| 
| cc.Thomas and Hajaek
| 
| First I would like to express thanks to Thomas and Hajaek for their replies.
| 
| Due to my writing being poor, I could not represent what I would like to say
| correctly. 
| 
| I have a little knowledge about -ffast-math option in GCC and the option 
perhaps may causes troubles with in the numerical calculation. So this option 
should be treated with grate care.
| 
| The questioner in the octave thread in Japan seems to be user of the Free 
BSD.  He felt that it was strange that --ffast-math option was described in the 
compiling octave in the package of octave in the FreeBSD port.
| 
| I feel that now this is matter of ML of FreeBSD  matter but not that of 
octave-help (and/or octave-maintainers).  
| 
| However I myself am not a FreeBSD user so that it would be grateful for me if 
somebody in these MLs who are users of FreeBSD will answer to his question:
| 
| Why are the -ffast-math option included in the compiling octave in the 
FreeBSD port of octave?

I think you should ask the people who packaged Octave for FreeBSD.

Based on the description in the GCC manual, I would generally
recommend against using -ffast-math.

jwe