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

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Date:	Mon, 27 Feb 2012 21:41:05 +0000
From:	James Bottomley <jbottomley@...allels.com>
To:	Paul Gortmaker <paul.gortmaker@...driver.com>
CC:	"kyle@...artin.ca" <kyle@...artin.ca>,
	"deller@....de" <deller@....de>,
	"vapier@...too.org" <vapier@...too.org>,
	"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 Mon, 2012-02-27 at 15:59 -0500, Paul Gortmaker wrote:
> Using the 64 bit toolchains from kernel.org[1], one finds that
> you can't build the a500_defconfig, because the Makefile will
> stomp whatever value you have in your env. for CROSS_COMPILE.
> 
> This shows up since the kernel.org toolchains for parisc-64
> do not have the "-gnu" prefix, and so you run into it always
> saying hppa64-linux-gnu-gcc not found, regardless of the fact
> you've not got "-gnu" put anywhere into CROSS_COMPILE.
> 
> Since you can set CROSS_COMPILE from the environment and/or set
> it in your .config file, there really is no need for it to be
> poked at by the Makefile at all.  So just delete it.
> 
> [1] ftp://ftp.kernel.org/pub/tools/crosstool/files/bin/x86_64/4.5.2/
> 
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
> 
> [v2: no ifdef/endif -- just delete the offending line.]
> 
> diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
> index 55cca1d..a533367 100644
> --- a/arch/parisc/Makefile
> +++ b/arch/parisc/Makefile
> @@ -31,7 +31,6 @@ ifdef CONFIG_64BIT
>  UTS_MACHINE	:= parisc64
>  CHECKFLAGS	+= -D__LP64__=1 -m64
>  WIDTH		:= 64
> -CROSS_COMPILE	:= hppa64-linux-gnu-
>  else # 32-bit
>  WIDTH		:=
>  endif

We can't do that ... it crashes a standard build almost immediately
because it doesn't pick the 64 bit compiler (and we have no biarch
solution).

We need make on a 64 bit config to work out of the box.  It breaks
with ?= as JDA pointed out because CROSS_COMPILE is always defined.
Does this satisfy everyone?

James

---

diff --git a/arch/parisc/Makefile b/arch/parisc/Makefile
index 55cca1d..19ab7b2 100644
--- a/arch/parisc/Makefile
+++ b/arch/parisc/Makefile
@@ -31,7 +31,11 @@ ifdef CONFIG_64BIT
 UTS_MACHINE	:= parisc64
 CHECKFLAGS	+= -D__LP64__=1 -m64
 WIDTH		:= 64
+
+# FIXME: if no default set, should really try to locate dynamically
+ifeq ($(CROSS_COMPILE),)
 CROSS_COMPILE	:= hppa64-linux-gnu-
+endif
 else # 32-bit
 WIDTH		:=
 endif