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/netstar/Makefile b/board/netstar/Makefile
index 3a20501..b7c092d 100644
--- a/board/netstar/Makefile
+++ b/board/netstar/Makefile
@@ -1,3 +1,6 @@
+#
+# (C) Copyright 2006
+# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
#
# (C) Copyright 2005
# Ladislav Michl, 2N Telekomunikace, michl@2n.cz
@@ -23,63 +26,71 @@
include $(TOPDIR)/config.mk
-LIB = lib$(BOARD).a
+LIB = $(obj)lib$(BOARD).a
-OBJS := netstar.o flash.o nand.o
+COBJS := netstar.o flash.o nand.o
SOBJS := setup.o crcek.o
+SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) eeprom.c \
+ eeprom_start.S
+OBJS := $(addprefix $(obj),$(COBJS))
+SOBJS := $(addprefix $(obj),$(SOBJS))
+
gcclibdir := $(shell dirname `$(CC) -print-libgcc-file-name`)
LOAD_ADDR = 0x10400000
LDSCRIPT = $(TOPDIR)/board/$(BOARDDIR)/eeprom.lds
+lnk = $(if $(obj),$(obj),.)
HOST_CFLAGS = -Wall -pedantic -I$(TOPDIR)/include
-all: $(LIB) eeprom.srec eeprom.bin crcek.srec crcek.bin crcit
+all: $(obj).depend $(LIB) $(obj)eeprom.srec $(obj)eeprom.bin \
+ $(obj)crcek.srec $(obj)crcek.bin $(obj)crcit
$(LIB): $(OBJS) $(SOBJS)
$(AR) crv $@ $^
-eeprom.srec: eeprom.o eeprom_start.o
- $(LD) -T $(LDSCRIPT) -g -Ttext $(LOAD_ADDR) \
- -o $(<:.o=) -e $(<:.o=) $^ \
- -L../../examples -lstubs \
- -L../../lib_generic -lgeneric \
+$(obj)eeprom.srec: $(obj)eeprom.o $(obj)eeprom_start.o
+ cd $(lnk) && $(LD) -T $(LDSCRIPT) -g -Ttext $(LOAD_ADDR) \
+ -o $(<:.o=) -e eeprom eeprom.o eeprom_start.o \
+ -L$(obj)../../examples -lstubs \
+ -L$(obj)../../lib_generic -lgeneric \
-L$(gcclibdir) -lgcc
$(OBJCOPY) -O srec $(<:.o=) $@
-eeprom.bin: eeprom.srec
+$(obj)eeprom.bin: $(obj)eeprom.srec
$(OBJCOPY) -I srec -O binary $< $@ 2>/dev/null
-crcek.srec: crcek.o
+$(obj)crcek.srec: $(obj)crcek.o
$(LD) -g -Ttext 0x00000000 \
- -o $(<:.o=) -e $(<:.o=) $^
+ -o $(<:.o=) -e crcek $^
$(OBJCOPY) -O srec $(<:.o=) $@
-crcek.bin: crcek.srec
+$(obj)crcek.bin: $(obj)crcek.srec
$(OBJCOPY) -I srec -O binary $< $@ 2>/dev/null
-crcit: crcit.o crc32.o
+$(obj)crcit: $(obj)crcit.o $(obj)crc32.o
$(HOSTCC) $(HOST_CFLAGS) -o $@ $^
-crcit.o: crcit.c
- $(HOSTCC) $(HOST_CFLAGS) -c $<
+$(obj)crcit.o: crcit.c
+ $(HOSTCC) $(HOST_CFLAGS) -o $@ -c $<
-crc32.o: $(TOPDIR)/tools/crc32.c
- $(HOSTCC) $(HOST_CFLAGS) -DUSE_HOSTCC -c $<
+$(obj)crc32.o: $(OBJTREE)/tools/crc32.c
+ $(HOSTCC) $(HOST_CFLAGS) -DUSE_HOSTCC -o $@ -c $<
clean:
- rm -f $(SOBJS) $(OBJS) eeprom eeprom.srec eeprom.bin \
- crcek crcek.srec crcek.bin
+ rm -f $(SOBJS) $(OBJS) $(obj)eeprom $(obj)eeprom.srec \
+ $(obj)eeprom.bin $(obj)crcek $(obj)crcek.srec \
+ $(obj)crcek.bin
distclean: clean
rm -f $(LIB) core *.bak .depend
#########################################################################
-.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
-sinclude .depend
+sinclude $(obj).depend
#########################################################################