linux-kernel - [PATCH RFC v2 5/5] samples/bpf: Add documentation on cross compilation

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Message-Id: <20170807130602.31785-6-joelaf@google.com>
Date:   Mon,  7 Aug 2017 06:06:02 -0700
From:   Joel Fernandes <joelaf@...gle.com>
To:     linux-kernel@...r.kernel.org
Cc:     Chenbo Feng <fengc@...gle.com>,
        Alison Chaiken <alison@...-devel.com>, Juri.Lelli@....com,
        Joel Fernandes <joelaf@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        netdev@...r.kernel.org (open list:BPF (Safe dynamic programs and tools))
Subject: [PATCH RFC v2 5/5] samples/bpf: Add documentation on cross compilation

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
+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
-- 
2.14.0.rc1.383.gd1ce394fe2-goog