From f93286397ed2a7084efb0362a43ee09f11702349 Mon Sep 17 00:00:00 2001
From: Marian Balakowicz <m8@semihalf.com>
Date: Fri, 1 Sep 2006 19:49:50 +0200
Subject: 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.
---
 common/Makefile | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

(limited to 'common/Makefile')

diff --git a/common/Makefile b/common/Makefile
index eb0b5da..d626fe4 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -1,5 +1,5 @@
 #
-# (C) Copyright 2004
+# (C) Copyright 2004-2006
 # Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 #
 # See file CREDITS for list of people who contributed to this
@@ -23,7 +23,7 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= libcommon.a
+LIB	= $(obj)libcommon.a
 
 AOBJS	=
 
@@ -53,28 +53,29 @@ COBJS	= main.o ACEX1K.o altera.o bedbug.o circbuf.o \
 	  usb.o usb_kbd.o usb_storage.o \
 	  virtex2.o xilinx.o crc16.o xyzModem.o
 
-OBJS	= $(AOBJS) $(COBJS)
+SRCS	:= $(AOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(AOBJS) $(COBJS))
 
 CPPFLAGS += -I..
 
 all:	$(LIB) $(AOBJS)
 
-$(LIB): .depend $(OBJS)
+$(LIB): $(obj).depend $(OBJS)
 	$(AR) crv $@ $(OBJS)
 
-environment.o: environment.c ../tools/envcrc
+$(obj)environment.o: $(src)environment.c $(obj)../tools/envcrc
 	$(CC) $(AFLAGS) -Wa,--no-warn \
-		-DENV_CRC=$(shell ../tools/envcrc) \
-		-c -o $@ environment.c
+		-DENV_CRC=$(shell $(obj)../tools/envcrc) \
+		-c -o $@ $(src)environment.c
 
-../tools/envcrc:
+$(obj)../tools/envcrc:
 	$(MAKE) -C ../tools
 
 #########################################################################
 
-.depend:	Makefile $(AOBJS:.o=.S) $(COBJS:.o=.c)
-		$(CC) -M $(CFLAGS) $(AOBJS:.o=.S) $(COBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
-- 
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