when we execute 'make' to build selftests, the TOP Makefile build gpio like:
selftests$ make ARCH= CROSS_COMPILE=
OUTPUT=/home/lizj/linux/tools/testing/selftests/gpio -C gpio
...
make[2]: Leaving directory '/home/lizj/linux/tools/gpio'
gcc -O2 -g -std=gnu99 -Wall -I../../../../usr/include/gpio-mockup-chardev.c
../../../gpio/gpio-utils.o ../../../../usr/include/linux/gpio.h
-I/usr/include/libmount -I/usr/include/blkid -I/usr/include/uuid -lmount -o
gpio-mockup-chardev
gcc: error: ../../../gpio/gpio-utils.o: No such file or directory
<builtin>: recipe for target 'gpio-mockup-chardev' failed
make[1]: *** [gpio-mockup-chardev] Error 1
make[1]: Leaving directory
'/home/lizj/linux/tools/testing/selftests/gpio'
Makefile:84: recipe for target 'all' failed
make: *** [all] Error 2
CC: Bamvor Jian Zhang <bamv2...@gmail.com>
CC: Bartosz Golaszewski <b...@bgdev.pl>
CC: Shuah Khan <sh...@kernel.org>
CC: linux-g...@vger.kernel.org
Signed-off-by: Li Zhijian <lizhij...@cn.fujitsu.com>
---
tools/testing/selftests/gpio/Makefile | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/gpio/Makefile
b/tools/testing/selftests/gpio/Makefile
index 1bbb475..e64a11c 100644
--- a/tools/testing/selftests/gpio/Makefile
+++ b/tools/testing/selftests/gpio/Makefile
@@ -24,7 +24,7 @@ LDLIBS += -lmount -I/usr/include/libmount
$(BINARIES): ../../../gpio/gpio-utils.o ../../../../usr/include/linux/gpio.h
../../../gpio/gpio-utils.o:
- make ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C ../../../gpio
+ make OUTPUT= ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C
../../../gpio
../../../../usr/include/linux/gpio.h:
make -C ../../../.. headers_install INSTALL_HDR_PATH=$(shell
pwd)/../../../../usr/
--
2.7.4
