linux-kernel - Re: [PATCH v2] selftests: gpio: fix Makefile

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Date:   Thu, 30 Mar 2017 21:14:38 +0800
From:   Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>
To:     Fathi Boudra <fathi.boudra@...aro.org>
Cc:     linux-kselftest@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: Re: [PATCH v2] selftests: gpio: fix Makefile

Hi, Fathi

Thanks for your patch.

On 28 March 2017 at 13:36, Fathi Boudra <fathi.boudra@...aro.org> wrote:
> * Fix hardcoded and misplaced libmount headers. Use pkg-config instead to
>   figure out CFLAGS/LDLIBS, fixing also their value for cross-compilation.
>   Note: if pkg-config is missing (command not found), it will fail to
>   build because headers can't be found or libmount library can't be
>   linked.
>
> * Fix the clean target to clean up also gpio-utils.
>
> * Fix gpio-mockup-chardev installation by using TEST_PROGS_EXTENDED
>   instead of BINARIES which is not supported by the top-level lib.mk.
>
> * Get rid of INSTALL_HDR_PATH. We don't need it since make -C is putting
>   us in the right location.
>
> * Improve readibility:
>   - introduce GPIODIR/GPIOOBJ/GPIOINC variables
>   - split CFLAGS on multiple lines
>
> Signed-off-by: Fathi Boudra <fathi.boudra@...aro.org>
> ---
>
> in v2:
>  * per Michael Ellerman request, revert to use exported headers instead of uapi.
>
>  tools/testing/selftests/gpio/Makefile | 31 ++++++++++++++++++-------------
>  1 file changed, 18 insertions(+), 13 deletions(-)
>
> diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile
> index 205e4d10e085..41826897af35 100644
> --- a/tools/testing/selftests/gpio/Makefile
> +++ b/tools/testing/selftests/gpio/Makefile
> @@ -1,23 +1,28 @@
> +CFLAGS += -O2 -g -std=gnu99 -Wall
> +CFLAGS += -I../../../../usr/include/
> +CFLAGS += $(shell pkg-config --cflags mount)
> +LDLIBS += $(shell pkg-config --libs mount)
>
>  TEST_PROGS := gpio-mockup.sh
> -TEST_FILES := gpio-mockup-sysfs.sh $(BINARIES)
> -BINARIES := gpio-mockup-chardev
> +TEST_PROGS_EXTENDED := gpio-mockup-chardev
> +TEST_FILES := gpio-mockup-sysfs.sh
> +
> +GPIODIR := ../../../gpio
> +GPIOOBJ := gpio-utils.o
> +GPIOINC := gpio.h
>
>  include ../lib.mk
>
> -all: $(BINARIES)
> +all: $(GPIOINC) $(TEST_PROGS_EXTENDED)
All the TEST_PROGS_EXTENDED should be TEST_GEN_FILES which will output to
KBUILD_OUTPUT/O directory when it enabled.
>
>  clean:
> -       $(RM) $(BINARIES)
> -
> -CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/
> -LDLIBS += -lmount -I/usr/include/libmount
> -
> -$(BINARIES): ../../../gpio/gpio-utils.o ../../../../usr/include/linux/gpio.h
> +       $(RM) $(TEST_PROGS_EXTENDED)
> +       $(MAKE) -C $(GPIODIR) clean
When I enable KBUILD_OUTPUT, it will affect the output directory in
tools/gpio and
output to wired directory:

$ make KBUILD_OUTPUT=$PWD/2001 -C tools/testing/selftests/ TARGETS=gpio
make: Entering directory
`/home/bamvor/works/source/kernel/linux/tools/testing/selftests'
for TARGET in gpio; do \
BUILD_TARGET=$BUILD/$TARGET; \
mkdir $BUILD_TARGET -p; \
make OUTPUT=$BUILD_TARGET -C $TARGET;\
done;
make[1]: Entering directory
`/home/bamvor/works/source/kernel/linux/tools/testing/selftests/gpio'
Makefile:19: warning: overriding commands for target `clean'
../lib.mk:55: warning: ignoring old commands for target `clean'
make -C ../../../gpio
make[2]: Entering directory `/home/bamvor/works/source/kernel/linux/tools/gpio'
mkdir -p /home/bamvor/works/source/kernel/linux/2001/gpioinclude/linux
2>&1 || true
ln -sf /home/bamvor/works/source/kernel/linux/tools/gpio/../../include/uapi/linux/gpio.h
/home/bamvor/works/source/kernel/linux/2001/gpioinclude/linux/gpio.h
make -f /home/bamvor/works/source/kernel/linux/tools/build/Makefile.build
dir=. obj=lsgpio
make[3]: Entering directory `/home/bamvor/works/source/kernel/linux/tools/gpio'
CC /home/bamvor/works/source/kernel/linux/2001/gpiolsgpio.o
CC /home/bamvor/works/source/kernel/linux/2001/gpiogpio-utils.o
LD /home/bamvor/works/source/kernel/linux/2001/gpiolsgpio-in.o

It could be fixed by building the tools/gpio manually or passing the
correct absolute path:
$(MAKE) OUTPUT=$(realpath $(GPIODIR))/ -C $(GPIODIR) clean

I looked for a bettter fix. But no progress so far. Loop Amaldo, hope could
get some input.
>
> -../../../gpio/gpio-utils.o:
> -       make ARCH=$(ARCH) CROSS_COMPILE=$(CROSS_COMPILE) -C ../../../gpio
> +$(TEST_PROGS_EXTENDED): $(GPIODIR)/$(GPIOOBJ)
>
> -../../../../usr/include/linux/gpio.h:
> -       make -C ../../../.. headers_install INSTALL_HDR_PATH=$(shell pwd)/../../../../usr/
> +$(GPIODIR)/$(GPIOOBJ):
> +       $(MAKE) -C $(GPIODIR)
Similiar to the above clean target.

Regards

Bamvor
>
> +$(GPIOINC):
> +       $(MAKE) -C ../../../.. headers_install
> --
> 2.11.0