linux-kernel - [PATCH] Fix CONFIG_CROSS

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Message-ID: <AANLkTim2mi0wbJJl17OkbCJbRt-s5phR4sumn5GsJKUp@mail.gmail.com>
Date:	Thu, 17 Jun 2010 12:50:52 +0000
From:	Tiago Maluta <tiago.maluta@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Roland McGrath <roland@...hat.com>
Subject: [PATCH] Fix CONFIG_CROSS_COMPILE issue in .config

Linux has an recent option to define CROSS_COMPILE in menuconfig.

Typically, one of the options when building for another target is
('arm' is just an example):

# make ARCH=arm CROSS_COMPILE=arm-cc O=../build

If I omit CROSS_COMPILE and use the new way in .config:
CONFIG_CROSS_COMPILE="arm-cc"

I got:

   cc1: error: unrecognized command line option "-mlittle-endian"
   cc1: error: unrecognized command line option "-mabi=aapcs-linux"
   cc1: error: unrecognized command line option "-mno-thumb-interwork"
   /usr/src/linux/kernel/bounds.c:1: error: bad value (armv5t) for
-march= switch
   /usr/src/linux/kernel/bounds.c:1: error: bad value (armv5t) for
-mtune= switch
   make[2]: *** [kernel/bounds.s] Error 1
   make[1]: *** [prepare0] Error 2
   make: *** [sub-make] Error 2

Verbose output clearly says that I'm using the host compiler instead
cross compiler.
This patch fixed my problem:

---
 Makefile |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/Makefile b/Makefile
index d49d96c..5a6c7d5 100644
--- a/Makefile
+++ b/Makefile
@@ -190,7 +190,7 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/i386/
-e s/sun4u/sparc64/ \
 export KBUILD_BUILDHOST := $(SUBARCH)
 ARCH           ?= $(SUBARCH)
 CROSS_COMPILE  ?=
-CROSS_COMPILE  ?= $(CONFIG_CROSS_COMPILE:"%"=%)
+CROSS_COMPILE  := $(shell grep CONFIG_CROSS_COMPILE .config | cut -d'"' -f2)

 # Architecture as present in compile.h
 UTS_MACHINE    := $(ARCH)
--
1.7.0.2


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