[yocto] When I build kernel with toolchain comes from yocto, I met an issue

[Paul Eggleton]

On Friday 23 January 2015 02:36:30 Lei, Maohui wrote:
> I compiled my kernel by toolchain that supported by yocto 1.7.
> The following is my steps:
> 1. Run the following command to install the toolchain.
>    # ./poky-lsb-glibc-x86_64-meta-toolchain-ppce500v2-toolchain-1.7.sh
> 
> 2. Set up the cross-development environment:
>    # . /opt/poky-lsb/1.7/environment-setup-ppce500v2-poky-linux-gnuspe
> 
> And then, I compiled the kernel source. But an error occurred:
> ----------------------------------------------------------------------------
> powerpc-poky-linux-gnuspe-ld: unrecognized option '-Wl,-O1'
> powerpc-poky-linux-gnuspe-ld: use the --help option for usage information
> make[1]: *** [init/mounts.o] Error 1
> make: *** [init] Error 2
> ----------------------------------------------------------------------------
> 
> I have to unset "LDFLAGS" to continue the build.
> 
> Is there some wrong with my step? Is there some good method to build a
> kernel source by the toolchain?

We generally expect the linker to be gcc rather than ld, hence our default 
value of LDFLAGS, so I think for building those bits of software that use ld 
directly (such as the kernel) it is expected that you need to either unset 
LDFLAGS or set it to a value that is appropriate for passing directly to ld 
(i.e. by removing -Wl, prefixes from all options).

Cheers,
Paul

-- 

Paul Eggleton
Intel Open Source Technology Centre