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Subject[PATCH v3 bpf-next 13/14] samples: bpf: makefile: add sysroot support
Date
Basically it only enables that was added by previous couple fixes.
Sysroot contains correct libs installed and its headers ofc. Useful
when working with NFC or virtual machine.

Usage:

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 133123d4c7d7..57ddf055d6c3 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -194,6 +194,11 @@ 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
+
EXTRA_CXXFLAGS := $(TPROGS_CFLAGS)

# options not valid for C++
--
2.17.1
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