Garrett Cooper schrieb am 2010-03-21:

i've experimented with setting CPUTYPE to native yesterday, but still couldn't figure out what the cause of it is. only a few points i'd like to point out:

1. this is very easily reproducible for me. i just need to set CPUTYPE=native in my /etc/make.conf and everything that gets linked against libc and uses the strlen() function won't compile due to gcc segfaulting. this is the case with /usr/src/bin/cat e.g. as well as kernel, world and probably lots of other stuff.

also the following gcc command segfaults too (no need for setting CPUTYPE=native in this case, because -mtune gets set manually):

gcc -v -x c -E -mtune=native /dev/null -o /dev/null 2>&1

2. there seems to be a connection with strlen.c because gcc alaways segfaults here. also i've been using CPUTYPE=native for years now and never had any problems with it. for me the segfault always happens in:

#0 strlen (str=Variable "str" is not available. ) at /usr/src/lib/libc/string/strlen.c:100 100 va = (*lp - mask01);

it would be nice if people with arch i386 and amd64 could try to reproduce this (i believe the other archs don't support CPUTYPE=native). again the easiest way to trigger this (you don't need to edit your /etc/make.conf for this) should be running:

gcc -v -x c -E -mtune=native /dev/null -o /dev/null 2>&1

for now i'm using the attached patch to prevent myself from shooting me in the foot again. ;)

cheers. alex

Index: share/mk/bsd.cpu.mk =================================================================== --- share/mk/bsd.cpu.mk (revision 205390) +++ share/mk/bsd.cpu.mk (working copy) @@ -53,10 +53,16 @@ CPUTYPE = athlon-mp . elif ${CPUTYPE} == "k7" CPUTYPE = athlon +#XXX: compiling gcc with -march=native causes libc problems +. elif ${CPUTYPE} == "native" +.error CPUTYPE native is not supported. . endif . elif ${MACHINE_ARCH} == "amd64" . if ${CPUTYPE} == "prescott" || ${CPUTYPE} == "core2" CPUTYPE = nocona +#XXX: compiling gcc with -march=native causes libc problems +. elif ${CPUTYPE} == "native" +.error CPUTYPE native is not supported. . endif . endif