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Subject[PATCH v4 bpf-next 14/15] samples/bpf: add sysroot support
Date
Basically it only enables that was added by previous couple fixes.
Sysroot contains correct libs installed and its headers. Useful when
working with NFC or virtual machine.

Usage example:

clean (on demand)
make ARCH=arm -C samples/bpf clean
make ARCH=arm -C tools clean
make ARCH=arm clean

configure and install headers:

make ARCH=arm defconfig
make ARCH=arm headers_install

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

Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
---
samples/bpf/Makefile | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 6b161326ac67..4df11ddb9c75 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -187,6 +187,11 @@ TPROGS_CFLAGS += -I$(srctree)/tools/lib/
TPROGS_CFLAGS += -I$(srctree)/tools/include
TPROGS_CFLAGS += -I$(srctree)/tools/perf

+ifdef SYSROOT
+TPROGS_CFLAGS += --sysroot=$(SYSROOT)
+TPROGS_LDFLAGS := -L$(SYSROOT)/usr/lib
+endif
+
TPROGCFLAGS_bpf_load.o += -Wno-unused-variable

TPROGS_LDLIBS += $(LIBBPF) -lelf
--
2.17.1
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