linux-kernel - Re: [PATCH] tools: iio: add ability to pass kernel headers

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Message-ID: <aa079d7f-3769-6961-1a13-8448ad0bc5cf@kernel.org>
Date:   Fri, 14 Apr 2017 16:23:51 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Randy Dunlap <rdunlap@...radead.org>, Sekhar Nori <nsekhar@...com>
Cc:     Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools: iio: add ability to pass kernel headers

On 14/04/17 16:23, Randy Dunlap wrote:
> On 04/14/17 07:42, Jonathan Cameron wrote:
>> On 11/04/17 12:06, Sekhar Nori wrote:
>>> Very often, especially when cross compiling, there is a need
>>> to pass kernel headers different from those installed on the
>>> build machine.
>>>
>>> Add support for doing this for iio utils by using the
>>> 'INSTALL_HDR_PATH' environment variable. This is supported by
>>> 'make headers_install' for installing kernel headers at a
>>> user specified location. So you will do:
>>>
>>> $ make headers_install ARCH=arm INSTALL_HDR_PATH=<absolute-path>
>>> $ make -C tools/iio ARCH=arm INSTALL_HDR_PATH=<absolute-path>
>>>
>>> Signed-off-by: Sekhar Nori <nsekhar@...com>
>>
>> It's a bit of an oddity as that usually refers to where to put
>> the headers rather than where they are.
>>
>> Is there a more general solution?  I couldn't find anything
>> particularly consistent in tools.
> 
> Whatever the solution is, it should be used for all tools/, not just iio.
> 
Agreed!
>>> ---
>>>  tools/iio/Makefile | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
>