Add support for a saving build objects in a separate directory.

Modifications are based on the linux kernel approach and
support two use cases:

  1) Add O= to the make command line
  'make O=/tmp/build all'

  2) Set environement variable BUILD_DIR to point to the desired location
  'export BUILD_DIR=/tmp/build'
  'make'

The second approach can also be used with a MAKEALL script
'export BUILD_DIR=/tmp/build'
'./MAKEALL'

Command line 'O=' setting overrides BUILD_DIR environent variable.

When none of the above methods is used the local build is performed and
the object files are placed in the source directory.

1 files changed, 22 insertions, 8 deletions

diff --git a/mkconfig b/mkconfig
index 4fe6e448bee..c3e4cea8d9e 100755
--- a/mkconfig
+++ b/mkconfig
@@ -5,7 +5,7 @@
 #
 # Parameters:  Target  Architecture  CPU  Board [VENDOR] [SOC]
 #
-# (C) 2002 DENX Software Engineering, Wolfgang Denk <wd@denx.de>
+# (C) 2002-2006 DENX Software Engineering, Wolfgang Denk <wd@denx.de>
 #
 
 APPEND=no	# Default: Create new config file
@@ -27,24 +27,38 @@ done
 
 echo "Configuring for ${BOARD_NAME} board..."
 
-cd ./include
-
 #
 # Create link to architecture specific headers
 #
-rm -f asm
-ln -s asm-$2 asm
+if [ "$SRCTREE" != "$OBJTREE" ] ; then
+	mkdir -p ${OBJTREE}/include
+	mkdir -p ${OBJTREE}/include2
+	cd ${OBJTREE}/include2
+	rm -f asm
+	ln -s ${SRCTREE}/include/asm-$2 asm
+	LNPREFIX="../../include2/asm/"
+	cd ../include
+	rm -rf asm-$2
+	rm -f asm
+	mkdir asm-$2
+	ln -s asm-$2 asm
+else
+	cd ./include
+	rm -f asm
+	ln -s asm-$2 asm
+fi
+
 rm -f asm-$2/arch
 
 if [ -z "$6" -o "$6" = "NULL" ] ; then
-	ln -s arch-$3 asm-$2/arch
+	ln -s ${LNPREFIX}arch-$3 asm-$2/arch
 else
-	ln -s arch-$6 asm-$2/arch
+	ln -s ${LNPREFIX}arch-$6 asm-$2/arch
 fi
 
 if [ "$2" = "arm" ] ; then
 	rm -f asm-$2/proc
-	ln -s proc-armv asm-$2/proc
+	ln -s ${LNPREFIX}proc-armv asm-$2/proc
 fi
 
 #