netdev - Re: [PATCH] bpfilter: fix user mode helper cross compilation

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Date:   Wed, 27 Jun 2018 23:17:09 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Matteo Croce <mcroce@...hat.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] bpfilter: fix user mode helper cross compilation

On Wed, 20 Jun 2018 16:04:34 +0200 Matteo Croce <mcroce@...hat.com> wrote:

> Use $(OBJDUMP) instead of literal 'objdump' to avoid
> using host toolchain when cross compiling.
> 

I'm still having issues here, with ld.

x86_64 machine, ARCH=i386:

y:/usr/src/25> make V=1 M=net/bpfilter
test -e include/generated/autoconf.h -a -e include/config/auto.conf || (       \
echo >&2;                                                       \
echo >&2 "  ERROR: Kernel configuration is invalid.";           \
echo >&2 "         include/generated/autoconf.h or include/config/auto.conf are missing.";\
echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";      \
echo >&2 ;                                                      \
/bin/false)
mkdir -p net/bpfilter/.tmp_versions ; rm -f net/bpfilter/.tmp_versions/*
make -f ./scripts/Makefile.build obj=net/bpfilter
(cat /dev/null;   echo kernel/net/bpfilter/bpfilter.ko;) > net/bpfilter/modules.order
  ld -m elf_i386   -r -o net/bpfilter/bpfilter.o net/bpfilter/bpfilter_kern.o net/bpfilter/bpfilter_umh.o ; scripts/mod/modpost net/bpfilter/bpfilter.o
ld: i386:x86-64 architecture of input file `net/bpfilter/bpfilter_umh.o' is incompatible with i386 output
scripts/Makefile.build:530: recipe for target 'net/bpfilter/bpfilter.o' failed
make[1]: *** [net/bpfilter/bpfilter.o] Error 1
Makefile:1518: recipe for target '_module_net/bpfilter' failed
make: *** [_module_net/bpfilter] Error 2

y:/usr/src/25> ld --version
GNU ld (GNU Binutils for Ubuntu) 2.29.1