From: Joel Fernandes Subject: [PATCH RFC v2 5/5] samples/bpf: Add documentation on cross compilation Date: Mon, 7 Aug 2017 06:06:02 -0700 Message-ID: <20170807130602.31785-6-joelaf@google.com> References: <20170807130602.31785-1-joelaf@google.com> Cc: Chenbo Feng , Alison Chaiken , Juri.Lelli@arm.com, Joel Fernandes , Alexei Starovoitov , Daniel Borkmann , netdev@vger.kernel.org (open list:BPF (Safe dynamic programs and tools)) To: linux-kernel@vger.kernel.org Return-path: In-Reply-To: <20170807130602.31785-1-joelaf@google.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Signed-off-by: Joel Fernandes --- 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