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Date:   Tue, 21 Oct 2014 20:27:57 +0200
From:   Richard Cochran <richardcochran@gmail.com>
To:     David Daney <ddaney.cavm@gmail.com>
Cc:     David Miller <davem@davemloft.net>, markos.chandras@imgtec.com,
        linux-mips@linux-mips.org, corbet@lwn.net, netdev@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        Peter Foley <pefoley2@pefoley.com>
Subject: Re: [PATCH] Documentation: ptp: Fix build failure on MIPS cross
 builds
Message-ID: <20141021182757.GA3960@localhost.localdomain>
References: <1413794538-28465-1-git-send-email-markos.chandras@imgtec.com>
 <20141021110724.GA16479@netboy>
 <20141021.123544.9516812519754063.davem@davemloft.net>
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(adding Makefile author Peter Foley onto CC)

On Tue, Oct 21, 2014 at 09:58:51AM -0700, David Daney wrote:
> On 10/21/2014 09:35 AM, David Miller wrote:
> >From: Richard Cochran <richardcochran@gmail.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?

Yes.

Peter, could you please fix it?

Thanks,
Richard