linux-kernel - [PATCH v3 2/2] selftests: gpio: Fix OUTPUT directory in Makefile

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Date:   Fri,  7 Sep 2018 09:34:55 -0500
From:   Daniel Díaz <daniel.diaz@...aro.org>
To:     shuahkh@....samsung.com, linux-kselftest@...r.kernel.org
Cc:     linus.walleij@...aro.org,
        Daniel Díaz <daniel.diaz@...aro.org>,
        Bamvor Jian Zhang <bamv2005@...il.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Shuah Khan <shuah@...nel.org>,
        linux-gpio@...r.kernel.org (open list:GPIO MOCKUP DRIVER),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 2/2] selftests: gpio: Fix OUTPUT directory in Makefile

When simply running `make' from the selftests top dir, this
error shows up:

  cc -O2 -g -std=gnu99 -Wall -I../../../../usr/include/ -I/usr/include/libmount -I/usr/include/blkid -I/usr/include/uuid    gpio-mockup-chardev.c ../../../gpio/gpio-utils.o  -lmount -o gpio-mockup-chardev
  cc: 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

because the output directory is set to "selftests/gpio" and
all binaries built from ../../../gpio/ end up there. In fact,
they appear as, exempli gratia:
* gpiogpio-event-mon
* gpiogpio-hammer
* gpioinclude/
* gpiolsgpio
which is wrong, as it's missing a directory separator
somewhere.

This patch sets straight the output directory when building
../../../gpio/ so that binaries don't cross paths.

Signed-off-by: Daniel Díaz <daniel.diaz@...aro.org>
---
 tools/testing/selftests/gpio/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile
index a4a01ec8..4664842 100644
--- a/tools/testing/selftests/gpio/Makefile
+++ b/tools/testing/selftests/gpio/Makefile
@@ -7,7 +7,7 @@ TEST_PROGS := gpio-mockup.sh
 TEST_FILES := gpio-mockup-sysfs.sh
 TEST_PROGS_EXTENDED := gpio-mockup-chardev
 
-GPIODIR := ../../../gpio
+GPIODIR := $(realpath ../../../gpio)
 GPIOOBJ := gpio-utils.o
 
 include ../lib.mk
@@ -16,11 +16,11 @@ all: $(TEST_PROGS_EXTENDED)
 
 override define CLEAN
 	$(RM) $(TEST_PROGS_EXTENDED)
-	$(MAKE) -C $(GPIODIR) clean
+	$(MAKE) -C $(GPIODIR) OUTPUT=$(GPIODIR)/ clean
 endef
 
 $(TEST_PROGS_EXTENDED):| khdr
 $(TEST_PROGS_EXTENDED): $(GPIODIR)/$(GPIOOBJ)
 
 $(GPIODIR)/$(GPIOOBJ):
-	$(MAKE) -C $(GPIODIR)
+	$(MAKE) OUTPUT=$(GPIODIR)/ -C $(GPIODIR)
-- 
2.7.4