linux-kernel - Re: [PATCH 2/7] selftests: add CFLAGS

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Date:	Thu, 27 Aug 2015 20:23:10 +1000
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>
Cc:	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	khilman@...aro.org, tyler.baker@...aro.org, shuahkh@....samsung.com
Subject: Re: [PATCH 2/7] selftests: add CFLAGS_EXTRA

On Tue, 2015-08-25 at 20:49 +0800, Bamvor Zhang Jian wrote:
> 
> On 08/24/2015 11:48 AM, Michael Ellerman wrote:
> > On Fri, 2015-08-14 at 21:43 +0800, Bamvor Jian Zhang wrote:
> >> One may pass the "-I /path/to/headers -L /path/to/lib" through
> >> CFLAGS_EXTRA for cross compiling. mqueue could compile pass
> >> in this way when we provide the popt.h and libpopt.so. And kdbus
> >> could compile pass with sys/capability and libcap.so
> > 
> > There should be no need to define a new variable.
> > 
> > You should just update the relevant Makefiles to use CFLAGS += rather than
> > CFLAGS =. And then you can just specifiy CFLAGS on the command line.

> yeap, it works for me. There is only one line need to be changed:

OK, so please send a patch to update that Makefile.

> diff --git a/tools/testing/selftests/mqueue/Makefile b/tools/testing/selftests/mqueue/Makefile
> index 0e3b41e..ca8327f 100644
> --- a/tools/testing/selftests/mqueue/Makefile
> +++ b/tools/testing/selftests/mqueue/Makefile
> @@ -1,4 +1,4 @@
> -CFLAGS = -O2
> +CFLAGS += -O2
>  
>  all:
>  	$(CC) $(CFLAGS) mq_open_tests.c -o mq_open_tests -lrt

And this can be simplified to:

LDLIBS = -lrt

all: mq_open_tests

cheers


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