linux-kernel - Re: [PATCH v4 4/4] samples/bpf: Add documentation on cross compilation

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Date:   Wed, 20 Sep 2017 09:50:07 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Joel Fernandes <joelaf@...gle.com>, linux-kernel@...r.kernel.org
Cc:     netdev@...r.kernel.org, alison@...-devel.com, juri.lelli@....com,
        fengc@...gle.com, daniel@...earbox.net, davem@...emloft.net,
        ast@...nel.org, kernel-team@...roid.com
Subject: Re: [PATCH v4 4/4] samples/bpf: Add documentation on cross
 compilation

On 09/20/17 09:11, Joel Fernandes wrote:
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> Signed-off-by: Joel Fernandes <joelaf@...gle.com>
> ---
>  samples/bpf/README.rst | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst
> index 79f9a58f1872..2b906127ef54 100644
> --- a/samples/bpf/README.rst
> +++ b/samples/bpf/README.rst
> @@ -64,3 +64,13 @@ It is also possible to point make to the newly compiled 'llc' or
>  'clang' command via redefining LLC or CLANG on the make command line::
>  
>   make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
> +
> +Cross compiling samples
> +-----------------------
> +Inorder to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH

   In order to

> +environment variables before calling make. This will direct make to build
> +samples for the cross target.
> +
> +export ARCH=arm64
> +export CROSS_COMPILE="aarch64-linux-gnu-"
> +make samples/bpf/ LLC=~/git/llvm/build/bin/llc CLANG=~/git/llvm/build/bin/clang
> 


-- 
~Randy