linux-kernel - Re: [PATCH 3/3] selftests/kcmp: Always try to build the test

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Date:	Tue, 02 Dec 2014 16:44:02 +1100
From:	Michael Ellerman <mpe@...erman.id.au>
To:	Christopher Covington <cov@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, shuahkh@....samsung.com,
	linux-api@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	gorcunov@...nvz.org
Subject: Re: [PATCH 3/3] selftests/kcmp: Always try to build the test

On Thu, 2014-10-23 at 09:06 -0400, Christopher Covington wrote:
> Hi Michael,
> 
> On 10/23/2014 01:07 AM, Michael Ellerman wrote:
> > Don't prevent the test building on non-x86. Just try and build it and
> > let the chips fall where they may.
> 
> As a user of kcmp via CRIU on arm and arm64, thanks!
> 
> > diff --git a/tools/testing/selftests/kcmp/Makefile b/tools/testing/selftests/kcmp/Makefile
> > index 4f00c0524501..cda9cc4004c9 100644
> > --- a/tools/testing/selftests/kcmp/Makefile
> > +++ b/tools/testing/selftests/kcmp/Makefile
> > @@ -1,21 +1,7 @@
> > -uname_M := $(shell uname -m 2>/dev/null || echo not)
> > -ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/i386/)
> > -ifeq ($(ARCH),i386)
> > -        ARCH := x86
> > -	CFLAGS := -DCONFIG_X86_32 -D__i386__
> > -endif
> > -ifeq ($(ARCH),x86_64)
> > -	ARCH := x86
> > -	CFLAGS := -DCONFIG_X86_64 -D__x86_64__
> > -endif
> >  CFLAGS += -I../../../../usr/include/
> >  
> >  all:
> > -ifeq ($(ARCH),x86)
> >  	gcc $(CFLAGS) kcmp_test.c -o kcmp_test
> 
> Not that this needs to be addressed in this patch, but this looks broken for
> cross compilation. It looks like some of the other selftests use:
> 
> CC = $(CROSS_COMPILE)gcc
> 
> But perhaps this should be set (and perhaps with ':=') once at the top level.

The best solution IMHO is:

  CC := $(CROSS_COMPILE)$(CC)

Because it allows cross compiling, but also allows overriding of CC.

Will resend with that change.

cheers


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