linux-kernel - Re: [PATCH] Documentation: ptp: Fix build failure on MIPS cross builds

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Message-ID: <544690CB.4030307@gmail.com>
Date:	Tue, 21 Oct 2014 09:58:51 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	David Miller <davem@...emloft.net>
CC:	richardcochran@...il.com, markos.chandras@...tec.com,
	linux-mips@...ux-mips.org, corbet@....net, netdev@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Documentation: ptp: Fix build failure on MIPS cross builds

On 10/21/2014 09:35 AM, David Miller wrote:
> From: Richard Cochran <richardcochran@...il.com>
> Date: Tue, 21 Oct 2014 13:07:25 +0200
>
>> On Mon, Oct 20, 2014 at 09:42:18AM +0100, Markos Chandras wrote:
>>> diff --git a/Documentation/ptp/Makefile b/Documentation/ptp/Makefile
>>> index 293d6c09a11f..397c1cd2eda7 100644
>>> --- a/Documentation/ptp/Makefile
>>> +++ b/Documentation/ptp/Makefile
>>> @@ -1,5 +1,15 @@
>>>   # List of programs to build
>>> +ifndef CROSS_COMPILE
>>>   hostprogs-y := testptp
>>> +else
>>> +# MIPS system calls are defined based on the -mabi that is passed
>>> +# to the toolchain which may or may not be a valid option
>>> +# for the host toolchain. So disable testptp if target architecture
>>> +# is MIPS but the host isn't.
>>> +ifndef CONFIG_MIPS
>>> +hostprogs-y := testptp
>>> +endif
>>> +endif
>>
>> It seems like a shame to simply give up and not compile this at all.
>> Is there no way to correctly cross compile this for MIPS?
>
> Yeah seriously, we should try to make this work instead of throwing our
> hands in the air.
>

We cross compile things successfully all the time for all the various 
MIPS ABIs.

It is a simple matter of having the Makefile setup for cross compiling.

What I don't understand is why we are using hostprogs in this Makefile. 
  Isn't this a program that would run on the target, not the build host?

David Daney
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