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.

2 files changed, 19 insertions, 13 deletions

diff --git a/board/versatile/Makefile b/board/versatile/Makefile
index fbdc627..27bca10 100644
--- a/board/versatile/Makefile
+++ b/board/versatile/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000-2004
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -23,13 +23,17 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
-OBJS	:= versatile.o flash.o
+COBJS	:= versatile.o flash.o
 SOBJS	:= lowlevel_init.o
 
-$(LIB):	$(OBJS) $(SOBJS)
-	$(AR) crv $@ $^
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	$(obj).depend $(OBJS) $(SOBJS)
+	$(AR) crv $@ $(OBJS) $(SOBJS)
 
 clean:
 	rm -f $(SOBJS) $(OBJS)
@@ -39,9 +43,9 @@ distclean:	clean
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/versatile/split_by_variant.sh b/board/versatile/split_by_variant.sh
index 576f238..25461c2 100755
--- a/board/versatile/split_by_variant.sh
+++ b/board/versatile/split_by_variant.sh
@@ -5,28 +5,30 @@
 # ---------------------------------------------------------
 # Set up the Versatile type define
 # ---------------------------------------------------------
+
+mkdir -p ${obj}include
 variant=PB926EJ-S
 if [ "$1" == "" ]
 then
 	echo "$0:: No parameters - using versatilepb_config"
-	echo "#define CONFIG_ARCH_VERSATILE_PB" > ./include/config.h
+	echo "#define CONFIG_ARCH_VERSATILE_PB" > ${obj}include/config.h
 	variant=PB926EJ-S
 else
 	case "$1" in
 	versatilepb_config	|	\
 	versatile_config)
-	echo "#define CONFIG_ARCH_VERSATILE_PB" > ./include/config.h
+	echo "#define CONFIG_ARCH_VERSATILE_PB" > ${obj}include/config.h
 	;;
 
 	versatileab_config)
-	echo "#define CONFIG_ARCH_VERSATILE_AB" > ./include/config.h
+	echo "#define CONFIG_ARCH_VERSATILE_AB" > ${obj}include/config.h
 	variant=AB926EJ-S
 	;;
 
 
 	*)
 	echo "$0:: Unrecognised config - using versatilepb_config"
-	echo "#define CONFIG_ARCH_VERSATILE_PB" > ./include/config.h
+	echo "#define CONFIG_ARCH_VERSATILE_PB" > ${obj}include/config.h
 	variant=PB926EJ-S
 	;;
 
@@ -36,5 +38,5 @@ fi
 # ---------------------------------------------------------
 # Complete the configuration
 # ---------------------------------------------------------
-./mkconfig -a versatile arm arm926ejs versatile NULL versatile
+$MKCONFIG -a versatile arm arm926ejs versatile NULL versatile
 echo "Variant:: $variant"