Date: Fri, 12 Sep 2003 21:10:17 +0000 From: Jens Rehsack <rehsack@liwing.de> To: culverk@yumyumyum.org Cc: freebsd-current@freebsd.org Subject: Re: GCC tickling obscure hardware bug or...? Message-ID: <3F623639.9070102@liwing.de> In-Reply-To: <1063396562.945f4dc2da041@mailhub.yumyumyum.org> References: <1063396282.9261.18.camel@borges> <1063396562.945f4dc2da041@mailhub.yumyumyum.org>
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culverk@yumyumyum.org wrote: > Quoting Scott Reese <sreese@codysbooks.com>: > > >>Hello all, I'm rephrasing my previous question to reflect new findings >>in my situation in the hopes that someone may have an idea of what's >>going on here (see thread "Internal compiler error in >>reload_cse_simplify_operands" from earlier this week). >> >>In a nutshell, I have upgraded my machine to a PIV 2.4 GHz processor on >>a VIA P4B 400 motherboard with 512 MB Samsung 2700 DDRAM. I have a 300 >>Watt power supply with a ball-bearing fan and a Seagate 40 GB HD. The >>problem I'm having that I did not see with my PIII is that I'm getting >>intermittent internal compiler errors when attempting to compile >>anything (again, see previous thread for an example). I even did a >>fresh install of the system yesterday in order to rule out something >>random getting hosed causing problems with my compiler. Through >>experimentation, I've found that toggling the CFLAGS from -O to -O2 or >>vice-versa works around the problem (actually, I've had greater success >>leaving my CFLAGS set to -O2 -pipe and occasionally bringing them back >>to -O -pipe when I run into an ICE and then setting them back again). >>My hunch is that some hardware bug is being tickled by gcc somehow. I >>don't think it's the standard "broken hardware" thing because I've not >>received any signal 11/7/4 errors at all and the system runs >>wonderfully. So far it's been up for over 24 hours, compiling ports and >>running without a hitch. The only strangeness is the compiler's >>behavior. Also, I should mention that I added >> >>options DISABLE_PSE >>options DISABLE_PG_G >> >>to my kernel config but the ICE's still persist, though they seem to be >>less frequent now. >> >>Attached is my dmesg, please let me know if anyone would like any more >>information about this or if you have any idea what might be going on >>here. >> >>Thank you, >>Scott >> > > > Whenever I've had problems like this, it's been either bad memory, or bad memory > settings in bios. I'd check both of those things. > > Ken According to several bug reports on gcc.gnu.org related to cse and p4 I strongly recommend to all whose using -On (with n>1) to add -fno-gcse etc. for all cse options. Of course, any interested can add themself as watcher for each interested reported gcc bug. Best, Jens
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