Date: Mon, 4 Jun 2001 09:38:00 -0400 (EDT) From: Andrew Gallatin <gallatin@cs.duke.edu> To: Riccardo.Veraldi@fi.infn.it Cc: <freebsd-alpha@FreeBSD.ORG> Subject: Re: make.conf Message-ID: <15131.36664.854626.740288@grasshopper.cs.duke.edu> In-Reply-To: <Pine.NEB.4.33.0106040909390.11253-100000@nikita.fi.infn.it> References: <Pine.NEB.4.33.0106040909390.11253-100000@nikita.fi.infn.it>
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Riccardo.Veraldi@fi.infn.it writes:
>
> I wanted to change the make.conf options in:
>
> cc -mcup=ev56 -O3 -funroll-loops -fexpensive-optimizations -fschedule-insns2
>
> Can I do it safely for compiling ports ?? or d o usuggest me to use the
> default gcc options cc -O -pipe only ??
>
> thanks
>
> Rick
Have you tried -O3 and seen this message?
cc1: warning:
***
*** The -O3 flag TRIGGERS KNOWN OPTIMIZER BUGS ON THIS PLATFORM
***
Which part of this message do you not understand? It seems rather
clear to me.
You can try to build something with -O3 -- The executable may work
fine, or it may crash. It might even crash the compiler during
compilation.
So use non-standard optimization flags at your own risk. And don't
report any "problems" you find after compiling with anything but the
standard optimization flags.
Drew
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