Date: Sat, 16 Jul 2011 21:02:21 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: "Julian H. Stacey" <jhs@berklix.com> Cc: hackers@freebsd.org Subject: Re: Freebsd-7.4 + std gcc 4.2.1 fails to honour -march=i586 Message-ID: <20110717020220.GM6611@dan.emsphone.com> In-Reply-To: <201107170119.p6H1JdII020844@fire.js.berklix.net> References: <201107170119.p6H1JdII020844@fire.js.berklix.net>
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In the last episode (Jul 17), Julian H. Stacey said: > Hi all, > ENVIRONMENT: > Standard > gcc version 4.2.1 20070719 [FreeBSD] > that comes with > FreeBSD 7.4-RELEASE > on my 686 host with > CFLAGS += -march=i586 > in > /etc/make.conf > used with > cd /usr/src/bin/who ; make clean ; make cleandir ; make clean ; make > reports > Warning: Object directory not changed from original /usr/src/usr.bin/who > cc -O2 -fno-strict-aliasing -march=i586 -c /usr/src/usr.bin/who/who.c > cc -O2 -fno-strict-aliasing -march=i586 -o who who.o > looking with > file who > reports > who: ELF 32-bit LSB executable, Intel 80386, version 1 > (FreeBSD), for FreeBSD 7.4, dynamically linked (uses shared > libs), FreeBSD-style, not stripped > > Problem: > Use it from a 586 7.4-RELEASE host (AMD+NFS) > file /host/sony/usr/src/usr.bin/who/who > /host/sony/usr/src/usr.bin/who/who: ELF 32-bit LSB executable, > Intel 80386, version 1 (FreeBSD), for FreeBSD 7.4, dynamically > linked (uses shared libs), FreeBSD-style, not stripped > /host/sony/usr/src/usr.bin/who/who > fails with > Illegal instruction Were the crt*.o files on your fast machine also compiled with -march=i586 ? If you run gdb on the core file, can you determine what function the bad instruction is in? -- Dan Nelson dnelson@allantgroup.com
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