[PATCH] selftests: gpio: Find libmount with pkg-config if available

[PATCH] selftests: gpio: Find libmount with pkg-config if available

[Daniel Díaz]

If pkg-config is available, use it to define the CFLAGS and
LDLIBS needed for libmount; else, use the current hard-coded
paths and options.

Using pkg-config is very helpful for cross-compilation
environments, and is sometimes readily available on developer
boxes to ensure we get the right compiler/linker options for
the given package.

Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
---
 tools/testing/selftests/gpio/Makefile | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile
index 46648427d537..f22b22aef7bf 100644
--- a/tools/testing/selftests/gpio/Makefile
+++ b/tools/testing/selftests/gpio/Makefile
@@ -1,7 +1,13 @@
 # SPDX-License-Identifier: GPL-2.0
 
-CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/
-LDLIBS += -lmount -I/usr/include/libmount
+MOUNT_CFLAGS := $(shell pkg-config --cflags mount 2>/dev/null)
+MOUNT_LDLIBS := $(shell pkg-config --libs mount 2>/dev/null)
+ifeq ($(MOUNT_LDLIBS),)
+MOUNT_LDLIBS := -lmount -I/usr/include/libmount
+endif
+
+CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/ $(MOUNT_CFLAGS)
+LDLIBS += $(MOUNT_LDLIBS)
 
 TEST_PROGS := gpio-mockup.sh
 TEST_FILES := gpio-mockup-sysfs.sh
-- 
2.17.1

Re: [PATCH] selftests: gpio: Find libmount with pkg-config if available

[Linus Walleij]

Sorry for top-posting,

I don't understand the selftest environment very well so I do not know
if this is the right thing to do.

I can merge the patch through the GPIO tree but I need a nod from
someone wise, like Shuah Khan or Anders Roxell (Anders has been
using the GPIO selftests) that this is the direction we want to go.

Yours,
Linus Walleij

On Tue, Oct 16, 2018 at 11:47 PM Daniel Díaz <daniel.diaz@linaro.org> wrote:

> If pkg-config is available, use it to define the CFLAGS and
> LDLIBS needed for libmount; else, use the current hard-coded
> paths and options.
>
> Using pkg-config is very helpful for cross-compilation
> environments, and is sometimes readily available on developer
> boxes to ensure we get the right compiler/linker options for
> the given package.
>
> Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
> ---
>  tools/testing/selftests/gpio/Makefile | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile
> index 46648427d537..f22b22aef7bf 100644
> --- a/tools/testing/selftests/gpio/Makefile
> +++ b/tools/testing/selftests/gpio/Makefile
> @@ -1,7 +1,13 @@
>  # SPDX-License-Identifier: GPL-2.0
>
> -CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/
> -LDLIBS += -lmount -I/usr/include/libmount
> +MOUNT_CFLAGS := $(shell pkg-config --cflags mount 2>/dev/null)
> +MOUNT_LDLIBS := $(shell pkg-config --libs mount 2>/dev/null)
> +ifeq ($(MOUNT_LDLIBS),)
> +MOUNT_LDLIBS := -lmount -I/usr/include/libmount
> +endif
> +
> +CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/ $(MOUNT_CFLAGS)
> +LDLIBS += $(MOUNT_LDLIBS)
>
>  TEST_PROGS := gpio-mockup.sh
>  TEST_FILES := gpio-mockup-sysfs.sh
> --
> 2.17.1
>

Re: [PATCH] selftests: gpio: Find libmount with pkg-config if available

[Anders Roxell]

On Wed, 5 Dec 2018 at 22:50, Linus Walleij <linus.walleij@linaro.org> wrote:
>
> Sorry for top-posting,
>
> I don't understand the selftest environment very well so I do not know
> if this is the right thing to do.
>
> I can merge the patch through the GPIO tree but I need a nod from
> someone wise, like Shuah Khan or Anders Roxell (Anders has been
> using the GPIO selftests) that this is the direction we want to go.

Yes this makes sense and its already in linux-next.

Cheers,
Anders

>
> Yours,
> Linus Walleij
>
> On Tue, Oct 16, 2018 at 11:47 PM Daniel Díaz <daniel.diaz@linaro.org> wrote:
>
> > If pkg-config is available, use it to define the CFLAGS and
> > LDLIBS needed for libmount; else, use the current hard-coded
> > paths and options.
> >
> > Using pkg-config is very helpful for cross-compilation
> > environments, and is sometimes readily available on developer
> > boxes to ensure we get the right compiler/linker options for
> > the given package.
> >
> > Signed-off-by: Daniel Díaz <daniel.diaz@linaro.org>
> > ---
> >  tools/testing/selftests/gpio/Makefile | 10 ++++++++--
> >  1 file changed, 8 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile
> > index 46648427d537..f22b22aef7bf 100644
> > --- a/tools/testing/selftests/gpio/Makefile
> > +++ b/tools/testing/selftests/gpio/Makefile
> > @@ -1,7 +1,13 @@
> >  # SPDX-License-Identifier: GPL-2.0
> >
> > -CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/
> > -LDLIBS += -lmount -I/usr/include/libmount
> > +MOUNT_CFLAGS := $(shell pkg-config --cflags mount 2>/dev/null)
> > +MOUNT_LDLIBS := $(shell pkg-config --libs mount 2>/dev/null)
> > +ifeq ($(MOUNT_LDLIBS),)
> > +MOUNT_LDLIBS := -lmount -I/usr/include/libmount
> > +endif
> > +
> > +CFLAGS += -O2 -g -std=gnu99 -Wall -I../../../../usr/include/ $(MOUNT_CFLAGS)
> > +LDLIBS += $(MOUNT_LDLIBS)
> >
> >  TEST_PROGS := gpio-mockup.sh
> >  TEST_FILES := gpio-mockup-sysfs.sh
> > --
> > 2.17.1
> >

Re: [PATCH] selftests: gpio: Find libmount with pkg-config if available

[shuah]

On 12/5/18 4:15 PM, Anders Roxell wrote:
> On Wed, 5 Dec 2018 at 22:50, Linus Walleij <linus.walleij@linaro.org> wrote:
>>
>> Sorry for top-posting,
>>
>> I don't understand the selftest environment very well so I do not know
>> if this is the right thing to do.
>>
>> I can merge the patch through the GPIO tree but I need a nod from
>> someone wise, like Shuah Khan or Anders Roxell (Anders has been
>> using the GPIO selftests) that this is the direction we want to go.
> 
> Yes this makes sense and its already in linux-next.
> 

Linus,

Great. I pulled this in last week into kselftest next for 4.21-rc1 
thinking that this is a good direction.

thanks,
-- Shuah