On Thu, 22 Jun 2017 11:48:38 +0800 kbuild test robot <fengguang.wu@xxxxxxxxx> wrote: > tree: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git thin-ar > head: f9aac183deb53716ea92f528595758e3c9ef3539 > commit: c5784ad98b773d08562a34b700e9c5e84763c0d8 [5/8] ia64: thin archives fix linking > config: ia64-allnoconfig (attached as .config) > compiler: ia64-linux-gcc (GCC) 6.2.0 > reproduce: > wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > git checkout c5784ad98b773d08562a34b700e9c5e84763c0d8 > # save the attached .config to linux build tree > make.cross ARCH=ia64 > > All warnings (new ones prefixed by >>): > > >> ia64-linux-ld: warning: .note.gnu.build-id section discarded, --build-id ignored. Sigh. What's happening here is that when performing the final link with the -R option, the linker forgets to emit the --build-id section it was asked to. This is the final link command line that causes the error: $ ia64-linux-ld -static -R arch/ia64/kernel/gate-syms.o --build-id -o vmlinux -T ./arch/ia64/kernel/vmlinux.lds --whole-archive built-in.o --no-whole-archive --start-group lib/lib.a arch/ia64/lib/lib.a --end-group However it links successfully if I do this: $ ia64-linux/bin/ia64-linux-ld -r -R arch/ia64/kernel/gate-syms.o -o syms.o $ ia64-linux/bin/ia64-linux-ld -static syms.o --build-id -o vmlinux -T ./arch/ia64/kernel/vmlinux.lds --whole-archive built-in.o --no-whole-archive --start-group lib/lib.a arch/ia64/lib/lib.a --end-group I.e., create an intermediate object file with the symbols first using symbols from gate-syms.o, and use that in the final link rather than -R Alan do you have any idea what the problem might be here? If it turns out to be a toolchain bug or limitation, I can do the same workaround in the kernel. Thanks, Nick -- To unsubscribe from this list: send the line "unsubscribe linux-kbuild" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
