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, 96 insertions, 29 deletions

diff --git a/drivers/Makefile b/drivers/Makefile
index 9be95c7bb8f..d0acf8e32f0 100644
--- a/drivers/Makefile
+++ b/drivers/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
@@ -25,9 +25,9 @@ include $(TOPDIR)/config.mk
 
 # CFLAGS += -DET_DEBUG -DDEBUG
 
-LIB	= libdrivers.a
+LIB	= $(obj)libdrivers.a
 
-OBJS	= 3c589.o 5701rls.o ali512x.o \
+COBJS	= 3c589.o 5701rls.o ali512x.o \
 	  bcm570x.o bcm570x_autoneg.o cfb_console.o cfi_flash.o \
 	  cs8900.o ct69000.o dataflash.o dc2114x.o dm9000x.o \
 	  e1000.o eepro100.o \
@@ -52,16 +52,19 @@ OBJS	= 3c589.o 5701rls.o ali512x.o \
 	  pxa_pcmcia.o mpc8xx_pcmcia.o tqm8xx_pcmcia.o	\
 	  rpx_pcmcia.o
 
+SRCS	:= $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
+
 all:	$(LIB)
 
-$(LIB): $(OBJS)
+$(LIB): $(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 #########################################################################
 
-.depend:	Makefile $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/drivers/nand/Makefile b/drivers/nand/Makefile
index 96f67dfca88..d7076586121 100644
--- a/drivers/nand/Makefile
+++ b/drivers/nand/Makefile
@@ -1,16 +1,45 @@
+#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
 include $(TOPDIR)/config.mk
 
-LIB := libnand.a
+LIB 	:= $(obj)libnand.a
+
+COBJS 	:= nand.o nand_base.o nand_ids.o nand_ecc.o nand_bbt.o
+
+SRCS 	:= $(COBJS:.o=.c)
+OBJS 	:= $(addprefix $(obj),$(COBJS))
 
-OBJS := nand.o nand_base.o nand_ids.o nand_ecc.o nand_bbt.o
 all:	$(LIB)
 
-$(LIB):	$(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 #########################################################################
 
-.depend:	Makefile $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/nand_legacy/Makefile b/drivers/nand_legacy/Makefile
index 7e2cf66730d..23df5b752bf 100644
--- a/drivers/nand_legacy/Makefile
+++ b/drivers/nand_legacy/Makefile
@@ -1,16 +1,45 @@
+#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation; either version 2 of
+# the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
 include $(TOPDIR)/config.mk
 
-LIB := libnand_legacy.a
+LIB 	:= $(obj)libnand_legacy.a
+
+COBJS 	:= nand_legacy.o
+
+SRCS 	:= $(COBJS:.o=.c)
+OBJS 	:= $(addprefix $(obj),$(COBJS))
 
-OBJS := nand_legacy.o
 all:	$(LIB)
 
-$(LIB):	$(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 #########################################################################
 
-.depend:	Makefile $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/sk98lin/Makefile b/drivers/sk98lin/Makefile
index 8ee0e216cde..ac21e02133f 100644
--- a/drivers/sk98lin/Makefile
+++ b/drivers/sk98lin/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2003
+# (C) Copyright 2003-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -24,15 +24,19 @@
 #
 # Makefile for the SysKonnect SK-98xx device driver.
 #
+
 include $(TOPDIR)/config.mk
 
-LIB := libsk98lin.a
+LIB	:= $(obj)libsk98lin.a
+
+COBJS	:= skge.o skaddr.o skgehwt.o skgeinit.o skgepnmi.o skgesirq.o \
+		ski2c.o sklm80.o skqueue.o skrlmt.o sktimer.o skvpd.o \
+		skxmac2.o skcsum.o #skproc.o
 
-OBJS :=     skge.o skaddr.o skgehwt.o skgeinit.o skgepnmi.o skgesirq.o \
-	     ski2c.o sklm80.o skqueue.o skrlmt.o sktimer.o skvpd.o \
-	     skxmac2.o skcsum.o #skproc.o
+COBJS	+= uboot_skb.o uboot_drv.o
 
-OBJS +=     uboot_skb.o uboot_drv.o
+SRCS	:= $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(COBJS))
 
 # DBGDEF =  \
 # -DDEBUG
@@ -84,18 +88,20 @@ endif
 EXTRA_CFLAGS += -I. -DSK_USE_CSUM $(DBGDEF)
 
 CFLAGS += $(EXTRA_CFLAGS)
+HOST_CFLAGS += $(EXTRA_CFLAGS)
 
 
 all:	$(LIB)
 
-$(LIB):	$(OBJS)
+$(LIB):	$(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
 #########################################################################
 
-.depend:	Makefile $(OBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
+