cross-compiling kernel using a 32-bit toolchain on a 64-bit machine

[Rock Lee]

On 2015/4/7 6:50, Mandeep Sandhu wrote:
> Hi All,
>
> I'm having trouble compiling my kernel using a 32-bit toolchain (for
> ARM) on a 64-bit host (Ubuntu 14.10). The kernel version is 3.14.17.
>
> I understand that 32-bit binaries require "ia32-libs" (or equivalent)
> for compiling on 64-bit hosts. I installed the required packages
> (lib32z1 lib32ncurses5 lib32bz2-1.0 for Ubuntu 14.10), but still keep
> getting errors:
>
> $ make CROSS_COMPILE=arm-none-linux-gnueabi- all
> Makefile:616: Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR:
> -fstack-protector not supported by compiler
> make: arm-none-linux-gnueabi-gcc: Command not found
>    CHK     include/config/kernel.release
>    CHK     include/generated/uapi/linux/version.h
>    CHK     include/generated/utsrelease.h
> make[1]: `include/generated/mach-types.h' is up to date.
>    CC      kernel/bounds.s
> /bin/sh: 1: arm-none-linux-gnueabi-gcc: not found
> make[1]: *** [kernel/bounds.s] Error 127
> make: *** [prepare0] Error 2
>
> I've ensured that the PATH to the toolchain binaries is correct.
>
> If I try to export CROSS_COMPILE to my environment, then too I get an
> error (although it's for a different reason):
>
> $ make all
> Makefile:616: Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR:
> -fstack-protector not supported by compiler
>    CHK     include/config/kernel.release
>    CHK     include/generated/uapi/linux/version.h
>    CHK     include/generated/utsrelease.h
> make[1]: `include/generated/mach-types.h' is up to date.
>    CC      kernel/bounds.s
> gcc: error: unrecognized argument in option ‘-mabi=aapcs-linux’
> gcc: note: valid arguments to ‘-mabi=’ are: ms sysv
> gcc: error: unrecognized command line option ‘-mlittle-endian’
> gcc: error: unrecognized command line option ‘-mapcs’
> gcc: error: unrecognized command line option ‘-mno-sched-prolog’
> gcc: error: unrecognized command line option ‘-mno-thumb-interwork’
> gcc: error: unrecognized command line option ‘-mfpu=vfp’
> make[1]: *** [kernel/bounds.s] Error 1
> make: *** [prepare0] Error 2
>
> It looks like make is starting a new shell which does not have either
> PATH (1st case) or  CROSS_COMPILE (2nd case) set.
>
> Any hints on how to get make to use the toolchain?
>
> Thanks,
> -mandeep
>
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Edit .config and set  CONFIG_CROSS_COMPILE to the path where your cross 
compiler is located.