[PATCH] dtc: Add -i option to support search paths

[Simon Glass]

Hi David,

On Mon, Mar 12, 2012 at 4:53 PM, David Gibson
<david at gibson.dropbear.id.au> wrote:
> On Tue, Mar 06, 2012 at 05:10:12PM -0800, Simon Glass wrote:
>> It is often inconvenient to place device tree files in the same directory
>> as their includes, or to specify the full path to include files.
>>
>> An example of this is in U-Boot where we have a .dtsi file for each SOC
>> type, and this is included by the board .dts file. We need to either use
>> a mechanism like:
>>
>> /include/ ARCH_CPU_DTS
>>
>> with sed or cpp to perform the replacement with the correct path, or
>> we must specify the full path in the file:
>>
>> /include/ "../../arch/arm/dts/tegra20.dtsi"
>>
>> The first option is not desirable since it requires anyone compiling the
>> file to first pre-process it. The second is not desirable since it
>> introduces a path which is project-specific into a file which is supposed
>> to be a hardware description. For example Linux and U-Boot are unlikely to
>> put these include files in the same place.
>>
>> It is much more convenient to specify the search patch on the command line
>> as is done with C pre-processors, for example.
>>
>> Introduce a -i option to add to the list of search paths used to find
>> source and include files.
>>
>> We cannot use -I as it is already in use. Other suggestions welcome.
>
> Looks pretty nice.  Include paths is a feature we've been kind of
> wanting for a bit, and this implementation looks reasonable. Obviously
> the fact that it's -i not -I like gcc isn't great, but as you say -I
> is already used, and I can't see a better option.

OK thanks.

>
> The only potential problem I can see is that it uses the same search
> path for /include/ and /incbin/.  I'm not sure if that's what we want
> or not.

Me neither, although it shouldn't hurt I think. I should at least
update the log message.

I will tidy up a few things and resend.

Regards,
Simon

>
> --
> David Gibson                    | I'll have my music baroque, and my code
> david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
>                                | _way_ _around_!
> http://www.ozlabs.org/~dgibson