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.

4 files changed, 56 insertions, 29 deletions

diff --git a/board/mpl/mip405/Makefile b/board/mpl/mip405/Makefile
index 9276f64ff8..87e507e8a2 100644
--- a/board/mpl/mip405/Makefile
+++ b/board/mpl/mip405/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000, 2001
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -22,14 +22,21 @@
 #
 
 include $(TOPDIR)/config.mk
+ifneq ($(OBJTREE),$(SRCTREE))
+$(shell mkdir -p $(obj)../common)
+endif
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
-OBJS	= $(BOARD).o ../common/flash.o cmd_mip405.o ../common/pci.o \
+COBJS	= $(BOARD).o ../common/flash.o cmd_mip405.o ../common/pci.o \
 			../common/usb_uhci.o ../common/memtst.o ../common/common_util.o
 
 SOBJS	= init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) crv $@ $(OBJS)
 
@@ -41,9 +48,9 @@ distclean:	clean
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/mpl/pati/Makefile b/board/mpl/pati/Makefile
index 1a9ce12117..c469e3facd 100644
--- a/board/mpl/pati/Makefile
+++ b/board/mpl/pati/Makefile
@@ -1,6 +1,6 @@
 #
-# (C) Copyright 2001	Wolfgang Denk, DENX Software Engineering, wd@denx.de
-#
+# (C) Copyright 2001-2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de
 #
 # See file CREDITS for list of people who contributed to this
 # project.
@@ -22,14 +22,20 @@
 #
 
 include $(TOPDIR)/config.mk
+ifneq ($(OBJTREE),$(SRCTREE))
+$(shell mkdir -p $(obj)../common)
+endif
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
-OBJS	:=  pati.o ../common/flash.o ../common/memtst.o cmd_pati.o ../common/common_util.o
+COBJS	:=  pati.o ../common/flash.o ../common/memtst.o cmd_pati.o ../common/common_util.o
 #### cmd_pati.o
-SOBJS	:=
 
-$(LIB):	$(OBJS)
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 clean:
@@ -40,9 +46,9 @@ 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/mpl/pip405/Makefile b/board/mpl/pip405/Makefile
index a818d08a59..833900d1d7 100644
--- a/board/mpl/pip405/Makefile
+++ b/board/mpl/pip405/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000, 2001
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -22,10 +22,13 @@
 #
 
 include $(TOPDIR)/config.mk
+ifneq ($(OBJTREE),$(SRCTREE))
+$(shell mkdir -p $(obj)../common)
+endif
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
-OBJS	= $(BOARD).o \
+COBJS	= $(BOARD).o \
 	  ../common/flash.o cmd_pip405.o ../common/pci.o \
 	  ../common/isa.o ../common/kbd.o \
 	  ../common/usb_uhci.o \
@@ -33,6 +36,10 @@ OBJS	= $(BOARD).o \
 
 SOBJS	= init.o
 
+SRCS	:= $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SOBJS	:= $(addprefix $(obj),$(SOBJS))
+
 $(LIB):	$(OBJS) $(SOBJS)
 	$(AR) crv $@ $(OBJS)
 
@@ -44,9 +51,9 @@ distclean:	clean
 
 #########################################################################
 
-.depend:	Makefile $(SOBJS:.o=.S) $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(SOBJS:.o=.S) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/board/mpl/vcma9/Makefile b/board/mpl/vcma9/Makefile
index 304c965d12..bd76e7475c 100644
--- a/board/mpl/vcma9/Makefile
+++ b/board/mpl/vcma9/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000, 2001, 2002
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -22,15 +22,22 @@
 #
 
 include $(TOPDIR)/config.mk
+ifneq ($(OBJTREE),$(SRCTREE))
+$(shell mkdir -p $(obj)../common)
+endif
 
-LIB	= lib$(BOARD).a
+LIB	= $(obj)lib$(BOARD).a
 
-OBJS	:= vcma9.o flash.o cmd_vcma9.o
-OBJS	+= ../common/common_util.o ../common/memtst.o
+COBJS	:= vcma9.o flash.o cmd_vcma9.o
+COBJS	+= ../common/common_util.o ../common/memtst.o
 
 SOBJS	:= lowlevel_init.o
 
-$(LIB):	$(OBJS) $(SOBJS)
+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:
@@ -41,9 +48,9 @@ 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
 
 #########################################################################