Hi MJ, On Mon, Sep 16, 2013 at 8:23 PM, MJ embd <mj.e...@gmail.com> wrote:
> PS: Last message was sent without body, please ignore > > 0 down vote favorite > > > I am trying to understand a second level makefile of uboot (this > makefile was in a sub directory) > > a) What is the difference between $(COBJS:.o=.c) and COBJS := > test_main.o > $(COBJS:.o=.c) means to evaluate $(COBJS) but replace every .o with .c COBJS := test_main.o means that COBJS is assigned the value test_main.o > b) What is the meaning of $(call cmd_link_o_target, $(OBJS)). What is > the cmd_link_o_target and what is the call statement doing > This is linking the object files together with a partial link (ld -r). See config.mk for the definition. > c) Does this line creating 2 targets ? > > ALL := $(obj).depend $(LIB) > It defines variable ALL to be those two things (the depend file and the library). So that all: $(ALL) means that we need to build the depend file and the library. > ===================================Makefile=================== > > include $(TOPDIR)/config.mk > > LIB = $(obj)libtest.o > > SOBJS := test.o > > COBJS := test_main.o > COBJS += diagnostic.o > > > SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c) > OBJS := $(addprefix $(obj),$(COBJS) $(SOBJS)) > > ALL := $(obj).depend $(LIB) > > all: $(ALL) > > $(LIB): $(OBJS) > $(call cmd_link_o_target, $(OBJS)) > > ######################################################################### > > # defines $(obj).depend target > include $(SRCTREE)/rules.mk > > sinclude $(obj).depend > > ######################################################################### > > This might help a bit: http://www.gnu.org/software/make/manual/make.html Regards, Simon
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