linux-kernel - Re: [PATCH v2] parisc: dont unconditionally override CROSS

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Date:	Tue, 28 Feb 2012 08:10:45 -0600
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Mike Frysinger <vapier@...too.org>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	"kyle@...artin.ca" <kyle@...artin.ca>,
	"deller@....de" <deller@....de>,
	"dave.anglin@...l.net" <dave.anglin@...l.net>,
	"linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>
Subject: Re: [PATCH v2] parisc: dont unconditionally override CROSS_COMPILE
 for 64 bit.

On Tue, 2012-02-28 at 01:06 -0500, Mike Frysinger wrote:
> On Monday 27 February 2012 22:17:01 James Bottomley wrote:
> > On Mon, 2012-02-27 at 20:04 -0500, Mike Frysinger wrote:
> > > On Monday 27 February 2012 17:03:10 James Bottomley wrote:
> > > > --- a/arch/parisc/Makefile
> > > > +++ b/arch/parisc/Makefile
> > > > 
> > > > -CROSS_COMPILE	:= hppa64-linux-gnu-
> > > > +
> > > > +# if no default set, try to find the corresponding 64 bit compiler
> > > > +ifeq ($(CROSS_COMPILE),)
> > > > +CROSS_COMPILE	:= $(shell $(CC) -dumpmachine | sed
> > > > s/hppa-\\\(.*\\\)/hppa64-\\1-/) +endif
> > > 
> > > fails when using "hppa2.0-xxx".  perhaps:

Is that a valid prefix?  I was thinking hppa32 might be, but hppa2.0 is
supposed to be hppa-xxx with -mpa-risc-2-0.

But anyway, I think being clever and removing unused stuff is likely
orthogonal to the first patch which is just making it all work.

> > > CROSS_COMPILE ?= $(shell $(CC) -dumpmachine | sed
> > > 's/^hppa[^-]*-/hppa64-/')
> > > 
> > > don't even need the ifeq check then
> > 
> > How is that different from Carlos' suggestion?
> 
> sorry, but i'm not seeing any e-mails from Carlos in this thread.  what is his 
> suggestion ?

Actually, I misspoke, it was your suggestion in the first thread.

> > The reason it doesn't work is the same ... CROSS_COMPILE is defined to be
> > empty.
> 
> my suggestion was purely an incremental improvement on the patch you posted.  
> it improves two things:
> 	- detection when the default tuple is hppa2.0-xxx rather than hppa-xxx
> 	- one line for set-variable-only-when-its-unset rather than three lines
> -mike

It can't be done ... defined but empty is different from not defined in
makefiles (ifdef or ?= only checks for not defined).  CROSS_COMPILE gets
automatically defined by the top level Makefile ... that's why we need a
check for empty not a check for not defined.

James


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