Subject: Re: chroot method: archs combos allowed - msg#00189

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Re: chroot method: archs combos allowed

Any 64bit system with 32bit emulation in the kernel can chroot. As for checking, cat > dummy.c << "EOF" && #include <stdio.h> int main() { printf("Hi!\n"); } EOF (gcc -m32 dummy.c -o dummy && ./dummy | grep "Hi" >/dev/null) || echo "You can not run 32bit programs" If the program can run it will print Hi. if grep doesn't see Hi you can take action todo what ever you want. -- http://linuxfromscratch.org/mailman/listinfo/cross-lfs FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page

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Re: chroot method: archs combos allowed

On Sat, 25 Mar 2006, M.Canales.es wrote: My concern is that we could to test if the 32-bits libraries are presents, but in a pure-64 system, how could we test if the 32-bit emulation is supported by the kernel? That I don't know. In practical terms, you might want to stick with looking for the 32-bit libraries (or Joe's -m32, although it will only succeed on multilib) For ppc, 'G5' macs (970 processors) need a 64-bit kernel anyway, so you have to go beyond the book to build the headers, C cross-compiler and binutils (only). Therefore, they can equally chroot while trying to build ppc64 multilib. I'm lost when spooking about that archs. I will need "answers for dumbs" to know what triplets combos are allowed and what not :-? I suspect ppc64 is not for the dumb, which is why I have so much trouble with it :-( When mine runs 32-bit userspace, I use linux32 to invoke gdm (or init, I think) so that userspace is convinced it's really on just ppc - think of linux32 as another sort of uname hack, which alters the kernel personality. Certainly, in recent 2.6 it cannot boot with a 32-bit kernel, but that has not always been true. It's easy enough for me to -know- I need a 64-bit kernel, but pretty hard to codify. Something like cat /proc/cpuinfo | grep PPC970 >/dev/null && echo "chroot is supported" Ken -- das eine Mal als Tragödie, das andere Mal als Farce -- http://linuxfromscratch.org/mailman/listinfo/cross-lfs FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page

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Re: chroot method: archs combos allowed

Any 64bit system with 32bit emulation in the kernel can chroot. As for checking, cat > dummy.c << "EOF" && #include <stdio.h> int main() { printf("Hi!\n"); } EOF (gcc -m32 dummy.c -o dummy && ./dummy | grep "Hi" >/dev/null) || echo "You can not run 32bit programs" If the program can run it will print Hi. if grep doesn't see Hi you can take action todo what ever you want. -- http://linuxfromscratch.org/mailman/listinfo/cross-lfs FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page

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Re: chroot method: archs combos allowed

Ken Moffat wrote: > I don't think that will help on pure64, where no 32-bit libraries are > installed :-( ok, so use the cross-compiler and a little bit of a different method. cat > dummy.c << "EOF" && int main() { return 0; } EOF ($LFS_TARGET-gcc dummy.c -o dummy && ./dummy) || echo "You can't chroot" -- http://linuxfromscratch.org/mailman/listinfo/cross-lfs FAQ: http://www.linuxfromscratch.org/faq/ Unsubscribe: See the above information page