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/net/Makefile b/net/Makefile
index 7a70489..6fe4002 100644
--- a/net/Makefile
+++ b/net/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
@@ -25,19 +25,23 @@
# CFLAGS += -DET_DEBUG -DDEBUG
-LIB = libnet.a
+LIB = $(obj)libnet.a
-OBJS = net.o tftp.o bootp.o rarp.o eth.o nfs.o sntp.o
+COBJS = net.o tftp.o bootp.o rarp.o eth.o nfs.o sntp.o
+
+SRCS := $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(COBJS))
+
all: $(LIB)
-$(LIB): $(START) $(OBJS)
+$(LIB): $(obj).depend $(OBJS)
$(AR) crv $@ $(OBJS)
#########################################################################
-.depend: Makefile $(OBJS:.o=.c)
- $(CC) -M $(CFLAGS) $(OBJS:.o=.c) > $@
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
-sinclude .depend
+sinclude $(obj).depend
#########################################################################