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.
---
 cpu/i386/Makefile | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

(limited to 'cpu/i386/Makefile')

diff --git a/cpu/i386/Makefile b/cpu/i386/Makefile
index c44412a..cd46dea 100644
--- a/cpu/i386/Makefile
+++ b/cpu/i386/Makefile
@@ -1,4 +1,7 @@
 #
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+# 
 # (C) Copyright 2002
 # Daniel Engström, Omicron Ceti AB, daniel@omicron.se.
 #
@@ -23,22 +26,26 @@
 
 include $(TOPDIR)/config.mk
 
-LIB	= lib$(CPU).a
+LIB	= $(obj)lib$(CPU).a
 
 START	= start.o start16.o reset.o
 COBJS	= serial.o interrupts.o cpu.o timer.o sc520.o
-AOBJS	= sc520_asm.o
+SOBJS	= sc520_asm.o
 
-all:	.depend $(START) $(LIB)
+SRCS	:= $(START:.o=.S) $(SOBJS:.o=.S) $(COBJS:.o=.c)
+OBJS	:= $(addprefix $(obj),$(SOBJS) $(COBJS))
+START	:= $(addprefix $(obj),$(START))
 
-$(LIB):	$(COBJS) $(AOBJS)
-	$(AR) crv $@ $(COBJS) $(AOBJS)
+all:	$(obj).depend $(START) $(LIB)
+
+$(LIB):	$(OBJS)
+	$(AR) crv $@ $(OBJS)
 
 #########################################################################
 
-.depend:	Makefile $(START:.o=.S) $(COBJS:.o=.c) $(AOBJS:.o=.S)
-		$(CC) -M $(CFLAGS) $(START:.o=.S) $(COBJS:.o=.c) $(AOBJS:.o=.S) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
 
-sinclude .depend
+sinclude $(obj).depend
 
 #########################################################################
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