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From: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
To: ast@kernel.org, daniel@iogearbox.net, yhs@fb.com,
	davem@davemloft.net, jakub.kicinski@netronome.com,
	hawk@kernel.org, john.fastabend@gmail.com
Cc: linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org, clang-built-linux@googlegroups.com,
	Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Subject: [PATCH bpf-next 11/11] samples: bpf: makefile: add sysroot support
Date: Tue, 10 Sep 2019 13:38:30 +0300
Message-ID: <20190910103830.20794-12-ivan.khoronzhuk@linaro.org> (raw)
In-Reply-To: <20190910103830.20794-1-ivan.khoronzhuk@linaro.org>

Basically it only enables that was added by previous couple fixes.
For sure, just make tools/include to be included after sysroot
headers.

export ARCH=arm
export CROSS_COMPILE=arm-linux-gnueabihf-
make samples/bpf/ SYSROOT="path/to/sysroot"

Sysroot contains correct libs installed and its headers ofc.
Useful when working with NFC or virtual machine.

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
 samples/bpf/Makefile   |  5 +++++
 samples/bpf/README.rst | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 4edc5232cfc1..68ba78d1dbbe 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -177,6 +177,11 @@ ifeq ($(ARCH), arm)
 CLANG_EXTRA_CFLAGS := $(D_OPTIONS)
 endif
 
+ifdef SYSROOT
+ccflags-y += --sysroot=${SYSROOT}
+PROGS_LDFLAGS := -L${SYSROOT}/usr/lib
+endif
+
 ccflags-y += -I$(objtree)/usr/include
 ccflags-y += -I$(srctree)/tools/lib/bpf/
 ccflags-y += -I$(srctree)/tools/testing/selftests/bpf/
diff --git a/samples/bpf/README.rst b/samples/bpf/README.rst
index 5f27e4faca50..786d0ab98e8a 100644
--- a/samples/bpf/README.rst
+++ b/samples/bpf/README.rst
@@ -74,3 +74,13 @@ 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
+
+If need to use environment of target board (headers and libs), the SYSROOT
+also can be set, pointing on FS of target board:
+
+export ARCH=arm64
+export CROSS_COMPILE="aarch64-linux-gnu-"
+make samples/bpf/ SYSROOT=~/some_sdk/linux-devkit/sysroots/aarch64-linux-gnu
+
+Setting LLC and CLANG is not necessarily if it's installed on HOST and have
+in its targets appropriate arch triple (usually it has several arches).
-- 
2.17.1


  parent reply index

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-10 10:38 [PATCH bpf-next 00/11] samples: bpf: improve/fix cross-compilation Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 01/11] samples: bpf: makefile: fix HDR_PROBE "echo" Ivan Khoronzhuk
2019-09-10 10:46   ` Sergei Shtylyov
2019-09-10 14:54     ` Ivan Khoronzhuk
2019-09-11 11:02       ` Sergei Shtylyov
2019-09-13 19:56         ` Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 02/11] samples: bpf: makefile: fix cookie_uid_helper_example obj build Ivan Khoronzhuk
2019-09-13 20:48   ` Yonghong Song
2019-09-13 21:25     ` Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 03/11] samples: bpf: makefile: use --target from cross-compile Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 04/11] samples: bpf: use own EXTRA_CFLAGS for clang commands Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 05/11] samples: bpf: makefile: use D vars from KBUILD_CFLAGS to handle headers Ivan Khoronzhuk
2019-09-13 21:12   ` Yonghong Song
2019-09-13 21:24     ` Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 06/11] samples: bpf: makefile: drop unnecessarily inclusion for bpf_load Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 07/11] samples: bpf: add makefile.prog for separate CC build Ivan Khoronzhuk
2019-09-13 21:33   ` Yonghong Song
2019-09-13 22:14     ` Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 08/11] samples: bpf: makefile: base progs build on makefile.progs Ivan Khoronzhuk
2019-09-13 21:41   ` Yonghong Song
2019-09-13 22:25     ` Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 09/11] samples: bpf: makefile: use CC environment for HDR_PROBE Ivan Khoronzhuk
2019-09-10 10:38 ` [PATCH bpf-next 10/11] libbpf: makefile: add C/CXX/LDFLAGS to libbpf.so and test_libpf targets Ivan Khoronzhuk
2019-09-13 21:43   ` Yonghong Song
2019-09-13 22:33     ` Ivan Khoronzhuk
2019-09-10 10:38 ` Ivan Khoronzhuk [this message]
2019-09-13 21:45   ` [PATCH bpf-next 11/11] samples: bpf: makefile: add sysroot support Yonghong Song
2019-09-13 22:36     ` Ivan Khoronzhuk

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