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.

3 files changed, 24 insertions, 11 deletions

diff --git a/board/integratorcp/Makefile b/board/integratorcp/Makefile
index 3d589fc..efafeb6 100644
--- a/board/integratorcp/Makefile
+++ b/board/integratorcp/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	:= integratorcp.o flash.o
+COBJS	:= integratorcp.o flash.o
 SOBJS	:= lowlevel_init.o memsetup.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/integratorcp/config.mk b/board/integratorcp/config.mk
index 25b79b3..e4c5c3b 100644
--- a/board/integratorcp/config.mk
+++ b/board/integratorcp/config.mk
@@ -3,3 +3,9 @@
 #
 
 TEXT_BASE = 0x01000000
+
+ifneq ($(OBJTREE),$(SRCTREE))
+# We are building u-boot in a separate directory, use generated
+# .lds script from OBJTREE directory.
+LDSCRIPT := $(OBJTREE)/board/$(BOARDDIR)/u-boot.lds
+endif
diff --git a/board/integratorcp/split_by_variant.sh b/board/integratorcp/split_by_variant.sh
index 3a35433..37ae517 100755
--- a/board/integratorcp/split_by_variant.sh
+++ b/board/integratorcp/split_by_variant.sh
@@ -98,14 +98,17 @@ then
 	echo -n "#undef CONFIG_CM_TCRAM  " 		>> tmp.fil
 	echo    " /* CM may not have TCRAM */" 		>> tmp.fil
 fi
-mv tmp.fil ./include/config.h
+
+mkdir -p ${obj}include
+mkdir -p ${obj}board/integratorcp
+mv tmp.fil ${obj}include/config.h
 # ---------------------------------------------------------
 #  Ensure correct core object loaded first in U-Boot image
 # ---------------------------------------------------------
-sed -r 's/CPU_FILE/cpu\/'$cpu'\/start.o/; s/#.*//' board/integratorcp/u-boot.lds.template > board/integratorcp/u-boot.lds
+sed -r 's/CPU_FILE/cpu\/'$cpu'\/start.o/; s/#.*//' ${src}board/integratorcp/u-boot.lds.template > ${obj}board/integratorcp/u-boot.lds
 # ---------------------------------------------------------
 # Complete the configuration
 # ---------------------------------------------------------
-./mkconfig -a integratorcp arm $cpu integratorcp;
+$MKCONFIG -a integratorcp arm $cpu integratorcp;
 echo "Variant:: $variant with core $cpu"