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.
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 @@
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
#########################################################################