On 2007-08-19 12:01 +0900, Ken Yamada <ken_at_tydfam.jp> wrote: > Does this mean that GCC 4.2.1 does not solve "loop optimization bug" > pointed out by Andrey Chernov (http://docs.freebsd.org/cgi/getmsg.cgi?fetch=282888+0+archive/2007/freebsd-current/20070701.freebsd-current) on 4.2.0? > > Is it a good idea of adding -fno-tree-vrp to CFLAGS in /etc/make.conf > to avoid this optimization bug for all compilation? (BTW, I leave -O3 > of CFLAGS as is in make.conf and just added -fno-tree-vrp to the end of > the line.) I did just that (added -fno-tree-vrp to CFLAGS) after it was found that gcc-4.2 had the optimizer bug, and have continued to build my system with -O2 (or other optimization levels as required). This seems to work just fine (no problems with ports that are not working when built with a plain -O2). I had suggested to make -fno-tree-vrp the default for our CC (could be overridden on the command line, but would allow to use all -O levels without being hit by the compiler bug; but it appears that nobody else liked the idea at that time, i.e. no response at all ...). Regards, STefanReceived on Sun Aug 19 2007 - 06:06:37 UTC
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