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, 139 insertions, 102 deletions

diff --git a/tools/Makefile b/tools/Makefile
index d3dcc7d..606f024 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000-2003
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -21,22 +21,23 @@
 # MA 02111-1307 USA
 #
 
-BINS	= img2srec$(SFX) mkimage$(SFX) envcrc$(SFX) gen_eth_addr$(SFX) bmp_logo$(SFX)
+BIN_FILES	= img2srec$(SFX) mkimage$(SFX) envcrc$(SFX) gen_eth_addr$(SFX) bmp_logo$(SFX)
 
-OBJS	= environment.o img2srec.o mkimage.o crc32.o envcrc.o gen_eth_addr.o bmp_logo.o
+OBJ_LINKS	= environment.o crc32.o
+OBJ_FILES	= img2srec.o mkimage.o envcrc.o gen_eth_addr.o bmp_logo.o
 
 ifeq ($(ARCH),mips)
-BINS   += inca-swap-bytes$(SFX)
-OBJS   += inca-swap-bytes.o
+BIN_FILES	+= inca-swap-bytes$(SFX)
+OBJ_FILES	+= inca-swap-bytes.o
 endif
 
 # Don't build by default
 #ifeq ($(ARCH),ppc)
-#BINS   += mpc86x_clk$(SFX)
-#OBJS   += mpc86x_clk.o
+#BIN_FILES		+= mpc86x_clk$(SFX)
+#OBJ_FILES	+= mpc86x_clk.o
 #endif
 
-LOGO_H	= $(TOPDIR)/include/bmp_logo.h
+LOGO_H	= $(OBJTREE)/include/bmp_logo.h
 
 ifeq ($(LOGO_BMP),)
 LOGO_BMP= logos/denx.bmp
@@ -106,69 +107,76 @@ endif
 #
 include $(TOPDIR)/config.mk
 
+# now $(obj) is defined
+SRCS	:= $(addprefix $(obj),$(OBJ_LINKS:.o=.c)) $(OBJ_FILES:.o=.c) 
+BINS	:= $(addprefix $(obj),$(BIN_FILES))
+
 #
 # Use native tools and options
 #
-CPPFLAGS   = -idirafter ../include -DTEXT_BASE=$(TEXT_BASE) -DUSE_HOSTCC
+CPPFLAGS   = -idirafter $(SRCTREE)/include \
+		-idirafter $(OBJTREE)/include2 \
+		-idirafter $(OBJTREE)/include \
+		-DTEXT_BASE=$(TEXT_BASE) -DUSE_HOSTCC
 CFLAGS     = $(HOST_CFLAGS) $(CPPFLAGS) -O
 AFLAGS	   = -D__ASSEMBLY__ $(CPPFLAGS)
 CC	   = $(HOSTCC)
 STRIP	   = $(HOSTSTRIP)
 MAKEDEPEND = makedepend
 
-all:	.depend $(BINS) $(LOGO_H) subdirs
+all:	$(obj).depend $(BINS) $(LOGO_H) subdirs
 
-envcrc$(SFX):	envcrc.o crc32.o environment.o
+$(obj)envcrc$(SFX):	$(obj)envcrc.o $(obj)crc32.o $(obj)environment.o
 		$(CC) $(CFLAGS) -o $@ $^
 
-img2srec$(SFX):	img2srec.o
+$(obj)img2srec$(SFX):	$(obj)img2srec.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-mkimage$(SFX):	mkimage.o crc32.o
+$(obj)mkimage$(SFX):	$(obj)mkimage.o $(obj)crc32.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-ncb$(SFX):	ncb.o
+$(obj)ncb$(SFX):	$(obj)ncb.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-gen_eth_addr$(SFX):	gen_eth_addr.o
+$(obj)gen_eth_addr$(SFX):	$(obj)gen_eth_addr.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-bmp_logo$(SFX):	bmp_logo.o
+$(obj)bmp_logo$(SFX):	$(obj)bmp_logo.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-inca-swap-bytes$(SFX):	inca-swap-bytes.o
+$(obj)inca-swap-bytes$(SFX):	$(obj)inca-swap-bytes.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-mpc86x_clk$(SFX):	mpc86x_clk.o
+$(obj)mpc86x_clk$(SFX):	$(obj)mpc86x_clk.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 		$(STRIP) $@
 
-envcrc.o:	envcrc.c
-		$(CC) -g $(CFLAGS) -c $<
+$(obj)envcrc.o:	$(src)envcrc.c
+		$(CC) -g $(CFLAGS) -c -o $@ $<
 
-crc32.o:	crc32.c
-		$(CC) -g $(CFLAGS) -c $<
+$(obj)crc32.o:	$(obj)crc32.c
+		$(CC) -g $(CFLAGS) -c -o $@ $<
 
-mkimage.o:	mkimage.c
-		$(CC) -g $(CFLAGS) -c $<
+$(obj)mkimage.o:	$(src)mkimage.c
+		$(CC) -g $(CFLAGS) -c -o $@ $<
 
-ncb.o:		ncb.c
-		$(CC) -g $(CFLAGS) -c $<
+$(obj)ncb.o:		$(src)ncb.c
+		$(CC) -g $(CFLAGS) -c -o $@ $<
 
-gen_eth_addr.o:	gen_eth_addr.c
-		$(CC) -g $(CFLAGS) -c $<
+$(obj)gen_eth_addr.o:	$(src)gen_eth_addr.c
+		$(CC) -g $(CFLAGS) -c -o $@ $<
 
-inca-swap-bytes.o:	inca-swap-bytes.c
-		$(CC) -g $(CFLAGS) -c $<
+$(obj)inca-swap-bytes.o:	$(src)inca-swap-bytes.c
+		$(CC) -g $(CFLAGS) -c -o $@ $<
 
-mpc86x_clk.o:	mpc86x_clk.c
-		$(CC) -g $(CFLAGS) -c $<
+$(obj)mpc86x_clk.o:	$(src)mpc86x_clk.c
+		$(CC) -g $(CFLAGS) -c -o $@ $<
 
 subdirs:
 ifeq ($(TOOLSUBDIRS),)
@@ -184,25 +192,25 @@ else
 		done
 endif
 
-environment.c:
-		@rm -f environment.c
-		ln -s ../common/environment.c environment.c
+$(obj)environment.c:
+		@rm -f $(obj)environment.c
+		ln -s $(src)../common/environment.c $(obj)environment.c
 
-environment.o: environment.c
-		$(CC) -g $(HOST_ENVIRO_CFLAGS) $(CPPFLAGS) -c $<
+$(obj)environment.o:	$(obj)environment.c
+		$(CC) -g $(HOST_ENVIRO_CFLAGS) $(CPPFLAGS) -c -o $@ $<
 
-crc32.c:
-		@rm -f crc32.c
-		ln -s ../lib_generic/crc32.c crc32.c
+$(obj)crc32.c:
+		@rm -f $(obj)crc32.c
+		ln -s $(src)../lib_generic/crc32.c $(obj)crc32.c
 
-$(LOGO_H):	bmp_logo $(LOGO_BMP)
-		./bmp_logo $(LOGO_BMP) >$@
+$(LOGO_H):	$(obj)bmp_logo $(LOGO_BMP)
+		$(obj)./bmp_logo $(LOGO_BMP) >$@
 
 #########################################################################
 
-.depend:	Makefile $(OBJS:.o=.c)
-		$(CC) -M $(HOST_CFLAGS) $(CPPFLAGS) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/tools/env/Makefile b/tools/env/Makefile
index 9ce477c..1f16768 100644
--- a/tools/env/Makefile
+++ b/tools/env/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2002
+# (C) Copyright 2002-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -21,25 +21,28 @@
 # MA 02111-1307 USA
 #
 
-SOURCES := crc32.c  fw_env.c  fw_env_main.c
-HEADERS := fw_env.h
+include $(TOPDIR)/config.mk
 
-all:	fw_printenv
+SRCS	:= $(obj)crc32.c  fw_env.c  fw_env_main.c
+HEADERS	:= fw_env.h
 
-fw_printenv:	$(SOURCES) $(HEADERS)
-	$(CROSS_COMPILE)gcc -Wall -DUSE_HOSTCC $(SOURCES) -o fw_printenv
+CPPFLAGS := -Wall -DUSE_HOSTCC
+
+all:	$(obj)fw_printenv
+
+$(obj)fw_printenv:	$(SRCS) $(HEADERS)
+	$(CROSS_COMPILE)gcc $(CPPFLAGS) $(SRCS) -o $(obj)fw_printenv
 
 clean:
-	rm -f fw_printenv crc32.c
+	rm -f $(obj)fw_printenv $(obj)crc32.c
 
-crc32.c:
-	ln -s ../../lib_generic/crc32.c crc32.c
+$(obj)crc32.c:
+	ln -s $(src)../../lib_generic/crc32.c $(obj)crc32.c
 
 #########################################################################
 
-.depend:	Makefile $(SOURCES)
-		$(CC) -M $(HOST_CFLAGS) $(CPPFLAGS) -DUSE_HOSTCC $(SOURCES) > $@
+include $(TOPDIR)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
diff --git a/tools/gdb/Makefile b/tools/gdb/Makefile
index e7618b7..dbcb91f 100644
--- a/tools/gdb/Makefile
+++ b/tools/gdb/Makefile
@@ -1,4 +1,7 @@
 #
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
 # (C) Copyright 2000
 # Murray Jensen <Murray.Jensen@csiro.au>
 #
@@ -25,7 +28,11 @@ include $(TOPDIR)/config.mk
 
 BINS	= gdbsend gdbcont
 
-OBJS	= gdbsend.o gdbcont.o error.o remote.o serial.o
+COBJS	= gdbsend.o gdbcont.o error.o remote.o serial.o
+
+OBJS	:= $(addprefix $(obj),$(COBJS))
+SRCS	:= $(COBJS:.o=.c) 
+BINS	:= $(addprefix $(obj),$(BINS))
 
 #
 # Use native tools and options
@@ -44,26 +51,26 @@ all:
 
 else	# ! CYGWIN
 
-all:	$(BINS)
+all:	$(obj).depend $(BINS)
 
-gdbsend:	gdbsend.o error.o remote.o serial.o
+$(obj)gdbsend:	$(obj)gdbsend.o $(obj)error.o $(obj)remote.o $(obj)serial.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 
-gdbcont:	gdbcont.o error.o remote.o serial.o
+$(obj)gdbcont:	$(obj)gdbcont.o $(obj)error.o $(obj)remote.o $(obj)serial.o
 		$(CC) $(CFLAGS) $(HOST_LDFLAGS) -o $@ $^
 
 clean:
 	rm -f $(OBJS)
 
 distclean:	clean
-	rm -f $(BINS) core *.bak .depend
+	rm -f $(BINS) $(obj)core $(obj)*.bak $(obj).depend
 
 #########################################################################
 
-.depend:	Makefile $(OBJS:.o=.c)
-		$(CC) -M $(CPPFLAGS) -I../include $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
--include .depend
+sinclude $(obj).depend
 
 #########################################################################
 
diff --git a/tools/updater/Makefile b/tools/updater/Makefile
index 3fa1912..e9684cb 100644
--- a/tools/updater/Makefile
+++ b/tools/updater/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2000
+# (C) Copyright 2000-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -25,62 +25,81 @@ LOAD_ADDR = 0x40000
 
 include $(TOPDIR)/config.mk
 
-PROG    = updater
-IMAGE   = updater.image
-SRC     = update.c flash.c flash_hw.c utils.c cmd_flash.c string.c ctype.c dummy.c
-ASRC    = ppcstring.S
-OBJS	= $(SRC:.c=.o) $(ASRC:.S=.o)
+PROG		= $(obj)updater
+IMAGE		= $(obj)updater.image
 
-LIB	= $(TOPDIR)/examples/libstubs.a
-LIBAOBJS=
-LIBCOBJS= $(TOPDIR)/examples/stubs.o
-LIBOBJS	= $(LIBAOBJS) $(LIBCOBJS)
+COBJS		= update.o flash.o flash_hw.o utils.o cmd_flash.o string.o ctype.o dummy.o
+COBJS_LINKS	= stubs.o
+AOBJS		= ppcstring.o
+AOBJS_LINKS	= memio.o
+
+OBJS	:= $(addprefix $(obj),$(COBJS) $(COBJS_LINKS) $(AOBJS) $(AOBJS_LINKS))
+SRCS	:= $(COBJS:.o=.c) $(AOBJS:.o=.S) $(addprefix $(obj), $(COBJS_LINKS:.o:.c) $(AOBJS_LINKS:.o:.S))
 
 CPPFLAGS += -I$(TOPDIR) -I$(TOPDIR)/board/MAI/AmigaOneG3SE
 CFLAGS   += -I$(TOPDIR)/board/MAI/AmigaOneG3SE
+AFLAGS   += -I$(TOPDIR)/board/MAI/AmigaOneG3SE
+
+DEPS = $(OBJTREE)/u-boot.bin $(OBJTREE)/tools/mkimage
+ifneq ($(DEPS),$(wildcard $(DEPS)))
+$(error "updater: Missing required objects, please run regular build first")
+endif
 
-all:	.depend $(LIB) $(PROG)
+all:	$(obj).depend $(PROG) $(IMAGE)
 
 #########################################################################
-$(LIB): .depend $(LIBOBJS)
-	$(AR) crv $@ $(LIBOBJS)
 
-%.srec:	%.o $(LIB)
+$(obj)%.srec:	%.o $(LIB)
 	$(LD) -g -Ttext $(LOAD_ADDR) -o $(<:.o=) -e $(<:.o=) $< $(LIB)
 	$(OBJCOPY) -O srec $(<:.o=) $@
 
-%.o: %.c
-	$(CC) $(CPPFLAGS) -c $<
+$(obj)%.o: %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+$(obj)%.o: %.S
+	$(CC) $(AFLAGS) -c -o $@ $<
+
+$(obj)memio.o: $(obj)memio.S
+	$(CC) $(AFLAGS) -c -o $@ $<
 
-%.o: %.S
-	$(CC) $(CPPFLAGS) -c $<
+$(obj)memio.S:
+	rm -f $(obj)memio.c
+	ln -s $(SRCTREE)/board/MAI/AmigaOneG3SE/memio.S $(obj)memio.S
+
+$(obj)stubs.o: $(obj)stubs.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+$(obj)stubs.c:
+	rm -f $(obj)stubs.c
+	ln -s $(SRCTREE)/examples/stubs.c $(obj)stubs.c
 
 #########################################################################
 
-updater: $(OBJS) $(LIB) $(TOPDIR)/board/MAI/AmigaOneG3SE/memio.o
-	$(LD) -g -Ttext $(LOAD_ADDR) -o updater -e _main $(OBJS) $(LIB)  \
-	$(TOPDIR)/board/MAI/AmigaOneG3SE/memio.o
-	$(OBJCOPY) -O binary updater updater.bin
+$(obj)updater: $(OBJS)
+	$(LD) -g -Ttext $(LOAD_ADDR) -o $(obj)updater -e _main $(OBJS)
+	$(OBJCOPY) -O binary $(obj)updater $(obj)updater.bin
 
-updater.image: updater $(TOPDIR)/u-boot.bin
-	cat >/tmp/tempimage updater.bin junk $(TOPDIR)/u-boot.bin
-	$(TOPDIR)/tools/mkimage -A ppc -O u-boot -T standalone -C none -a $(LOAD_ADDR) \
-	-e `ppc-elf32-nm updater | grep _main | cut --bytes=0-8` \
-	-n "Firmware Updater" -d /tmp/tempimage updater.image
+$(obj)updater.image: $(obj)updater $(OBJTREE)/u-boot.bin
+	cat >/tmp/tempimage $(obj)updater.bin junk $(OBJTREE)/u-boot.bin
+	$(OBJTREE)/tools/mkimage -A ppc -O u-boot -T standalone -C none -a $(LOAD_ADDR) \
+	-e `$(NM) $(obj)updater | grep _main | cut --bytes=0-8` \
+	-n "Firmware Updater" -d /tmp/tempimage $(obj)updater.image
 	rm /tmp/tempimage
-	cp updater.image /tftpboot
+	cp $(obj)updater.image /tftpboot
 
-updater.image2: updater $(TOPDIR)/u-boot.bin
-	cat >/tmp/tempimage updater.bin junk ../../create_image/image
-	$(TOPDIR)/tools/mkimage -A ppc -O u-boot -T standalone -C none -a $(LOAD_ADDR) \
-	-e `ppc-elf32-nm updater | grep _main | cut --bytes=0-8` \
-	-n "Firmware Updater" -d /tmp/tempimage updater.image
+(obj)updater.image2: $(obj)updater $(OBJTREE)/u-boot.bin
+	cat >/tmp/tempimage $(obj)updater.bin junk ../../create_image/image
+	$(OBJTREE)/tools/mkimage -A ppc -O u-boot -T standalone -C none -a $(LOAD_ADDR) \
+	-e `$(NM) $(obj)updater | grep _main | cut --bytes=0-8` \
+	-n "Firmware Updater" -d /tmp/tempimage $(obj)updater.image
 	rm /tmp/tempimage
-	cp updater.image /tftpboot
+	cp $(obj)updater.image /tftpboot
+
+#########################################################################
 
-.depend:	Makefile $(SRC) $(ASRC) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S)
-		$(CC) -M $(CFLAGS) $(SRC) $(ASRC) $(LIBCOBJS:.o=.c) $(LIBAOBJS:.o=.S) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################