Messages in this thread | | | Date | Sat, 14 Feb 2004 14:03:22 +0100 | From | Herbert Poetzl <> | Subject | Re: Kernel Cross Compiling |
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On Sat, Feb 14, 2004 at 12:32:07AM -0800, Timothy D. Witham wrote: > Just to point out that we (OSDL) already do this. > > http://www.osdl.org/projects/26lnxstblztn/results/ > > We are willing to add more but it is always willing > to look at adding more.
thanks, yes, I knew about that, but the thing is, I would like to use this as automated test (well first step of an automated test) for linux-vserver[1] development, and for that purpose i386/ia64 and ppc/ppc64 is a good start but not nearly sufficient, we currently 'support' (or at least try to ;) the following archs:
alpha, i386, ia64, mips/64, hppa/64, ppc/64 sparc/64, s390/x, x86_64, uml
and got an officially assigned syscall number for
i386, s390, sparc/64, sh3/4, x86_64
but if you are interested in extending this and making it available for linux-vserver kernel compile tests too, I'm willing to help if I can ...
TIA, Herbert
> Tim > > On Fri, 2004-02-13 at 12:57, Herbert Poetzl wrote: > > Hi Folks! > > > > I'm currently investigating the requirements/doability > > of a kernel cross compiling test bed/setup, able to do > > automated kernel builds for different architecture, > > just to see if it compiles and later to verify if a > > given patch breaks that compile on any of the tested > > archs ... > > > > here a short status, and some issues I ran into so far, > > some of them with solutions, others without, and some > > interesting? observations ... > > > > I would be happy if somebody who has done similar, or > > knows how to do it properly ;) could comment on that, > > and/or point out possible improvements ... > > > > TIA, > > Herbert > > > > > > 1) CROSS COMPILER / TOOLCHAIN > > > > after reading and testing several cross build and > > toolchain building howtos, I decided to do it a little > > different, because I do not need glibc to compile the > > kernel ... > > > > the result are two .spec files[1], or the commands > > used to build an appropriate toolchain ... > > > > for the binutils the required commands are: > > > > configure \ > > --disable-nls \ > > --prefix=/usr \ > > --mandir=/usr/share/man \ > > --infodir=/usr/share/info \ > > --target=${CROSS_ARCH}-linux > > make > > > > and for the gcc (after the binutils have been > > installed on the host): > > > > configure \ > > --enable-languages=c \ > > --disable-nls \ > > --disable-threads \ > > --disable-shared \ > > --disable-checking \ > > --prefix=/usr \ > > --mandir=/usr/share/man \ > > --infodir=/usr/share/info \ > > --target=${CROSS_ARCH}-linux > > make TARGET_LIBGCC2_CFLAGS='-Dinhibit_libc \ > > -D__gthr_posix_h' > > > > where ${CROSS_ARCH} is the target architecture you want > > to compile the toochain for, in my case, this where one > > of the following: > > > > alpha, hppa, hppa64, i386, ia64, m68k, mips, > > mips64, ppc, ppc64, s390, sparc, sparc64, x86_64 > > > > PROBLEMS HERE: > > > > I decided to use binutils 2.14.90.0.8, and gcc 3.3.2, > > but soon discovered that gcc-3.3.2 will not be able > > to build a cross compiler for some archs like the > > alpha, ia64, powerpc and even i386 ;) without some > > modifications[2] but with some help, I got all headers > > fixed, except for the ia64, which still doesn't work > > > > > > 2) KERNEL CROSS COMPILING > > > > equipped with the cross compiling toolchains for all > > but one of the architectures mentioned above, I wrote > > a little script, which basically does nothing else > > but compiling a given kernel for all possible archs. > > > > basically this can be accomplished by doing: > > > > make ARCH=<arch> CROSS_COMPILE=<arch>-linux- > > > > > > the first result was harrowing: > > > > 2.4.25-pre 2.6.2-rc > > ---------------------------------------------------- > > [ARCH alpha/alpha] succeeded. succeeded. > > [ARCH hppa/parisc] failed. failed. > > [ARCH hppa64/parisc] failed. failed. > > [ARCH i386/i386] succeeded. succeeded. > > [ARCH m68k/m68k] failed. failed. > > [ARCH mips/mips] failed. failed. > > [ARCH mips64/mips] failed. failed. > > [ARCH ppc/ppc] succeeded. succeeded. > > [ARCH ppc64/ppc64] failed. failed. > > [ARCH s390/s390] failed. failed. > > [ARCH sparc/sparc] failed. succeeded. > > [ARCH sparc64/sparc] failed. failed. > > [ARCH x86_64/x86_64] failed. succeeded. > > > > so only alpha, i386 and ppc did work on the first run. > > > > what I discovered was, that there IS a big difference > > between an empty .config file and a non exististing > > one, where latter allowed the make oldconfig to work > > similar to the make defaultconfig available on 2.6, > > and added some archs (see [3] for details) > > > > PROBLEMS & SOLUTIONS HERE: > > > > ppc64: > > CROSS32_COMPILE=ppc-linux- > > is needed to make this work as expected. > > > > hppa/hppa64: > > seems not to compile without using a very big > > patch, which changes a lot inside the kernel > > > > mips/mips64: > > seem to use the 'obsoleted' -mcpu= option > > which results in a cc1: error: invalid option > > `cpu=<cpu-here>' > > > > m68k: > > fails with a hundred errors in the includes > > > > > > 3) CONCLUSIONS > > > > it seems that recent kernels (2.4 and 2.6) do not support > > most of the architectures they contain without heavy > > patching (haven't tested for arm, sh3/4, ...) > > > > building cross compiler toolchains isn't that often done > > otherwise it would not require such modifications, and > > the documentation would be up to date ... > > > > it seems that with some minor patches and kernel tweaks > > an automated build is in reach, although some archs seem > > to break from one release to the other ... > > > > the non mainline branches, if they exist are some kernel > > versions behind the current mainstream kernel, which > > might not mean anything ... > > > > > > 4) LINKS & REFERENCES > > > > [1] http://vserver.13thfloor.at/Stuff/Cross/binutils-cross.spec > > http://vserver.13thfloor.at/Stuff/Cross/gcc-cross.spec > > > > [2] http://vserver.13thfloor.at/Stuff/Cross/ > > gcc-3.3.2-cross-alpha-fix.diff.bz2 > > gcc-3.3.2-cross-i386-fix.diff.bz2 > > gcc-3.3.2-cross-ia64-fix.diff.bz2 > > gcc-3.3.2-cross-powerpc-fix.diff.bz2 > > > > [3] http://vserver.13thfloor.at/Stuff/Cross/compile.info > > > > ia64: http://www.gelato.unsw.edu.au/kerncomp/ > > mips: http://www.linux-mips.org/kernel.html > > hppa: http://www.parisc-linux.org/kernel/index.html > > ppc64: http://linuxppc64.org/ > > > > > > - > > To unsubscribe from this list: send the line "unsubscribe linux-gcc" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- > Timothy D. Witham - Lab Director - wookie@osdl.org > Open Source Development Lab Inc - A non-profit corporation > 12725 SW Millikan Way - Suite 400 - Beaverton OR, 97005 > (503)-626-2455 x11 (office) (503)-702-2871 (cell) > (503)-626-2436 (fax) > > - > To unsubscribe from this list: send the line "unsubscribe linux-gcc" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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