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/dtt/Makefile b/dtt/Makefile
index 0a33478..486008a 100644
--- a/dtt/Makefile
+++ b/dtt/Makefile
@@ -1,4 +1,7 @@
#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+#
# (C) Copyright 2001
# Erik Theisen, Wave 7 Optics, etheisen@mindspring.com.
#
@@ -25,20 +28,23 @@
#CFLAGS += -DDEBUG
-LIB = libdtt.a
+LIB = $(obj)libdtt.a
-OBJS = lm75.o ds1621.o adm1021.o
+COBJS = lm75.o ds1621.o adm1021.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
#########################################################################