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/board/cerf250/Makefile b/board/cerf250/Makefile
index 83e3ba4..52712be 100644
--- a/board/cerf250/Makefile
+++ b/board/cerf250/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
@@ -23,12 +23,16 @@
include $(TOPDIR)/config.mk
-LIB = lib$(BOARD).a
+LIB = $(obj)lib$(BOARD).a
-OBJS := cerf250.o flash.o
+COBJS := cerf250.o flash.o
SOBJS := lowlevel_init.o
-$(LIB): $(OBJS) $(SOBJS)
+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:
@@ -39,9 +43,9 @@
#########################################################################
-.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
#########################################################################