[PATCH] tools: gpio: add kernel headers in CFLAGS

[Bamvor Jian Zhang <bamv2005@xxxxxxxxx>]

From: Bamvor Jian Zhang <bamvor.zhangjian@xxxxxxxxxx>

Gpio tools require linux/gpio.h which may be only exist in kernel
source code in a cross compile environment.

Add such header to CFLAGS to avoid compiling failure.

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@xxxxxxxxxx>
---
 tools/gpio/Makefile | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/gpio/Makefile b/tools/gpio/Makefile
index 4d198d5..6b8804f 100644
--- a/tools/gpio/Makefile
+++ b/tools/gpio/Makefile
@@ -1,5 +1,11 @@
+ifneq ($(INSTALL_HDR_PATH),)
+KERNEL_HEADERS := $(INSTALL_HDR_PATH)/include
+else
+KERNEL_HEADERS ?= $(abspath ../../usr/include)
+endif
+
 CC = $(CROSS_COMPILE)gcc
-CFLAGS += -Wall -g -D_GNU_SOURCE
+CFLAGS += -Wall -g -D_GNU_SOURCE -I $(KERNEL_HEADERS)
 
 all: lsgpio
 
-- 
2.6.2

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