From: Joel Fernandes <joelaf@google.com>
Date: Wed, 20 Sep 2017 16:11:59 +0000 (-0700)
Subject: samples/bpf: Add documentation on cross compilation
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8bf2ac25a96c69985a1a9fbbad7da22ae4343a38;p=linux.git

samples/bpf: Add documentation on cross compilation

Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Joel Fernandes <joelaf@google.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst
index 79f9a58f18727..5f27e4faca50c 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
+-----------------------
+In order to cross-compile, say for arm64 targets, export CROSS_COMPILE and ARCH
+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