makefile - how to link the objects in all subdirectory togother? -


i'm writing makefile framework project. say, have main.c in top dir, , many subdirs each containing c file. link object files togoter, assign initial value in top makefile:

export target_list := main.o

and in each subdirs, append them list:

# sub1/makefile target := a.o                                                                                                                                                           target_list += $(target)

when return top dir, target_list still main.o. i'm sure subdirs entered. there way this?

the top makefile:

all: main  export top_dir = $(shell pwd) export target_list := main.o subdirs := b c d  cflags := -iinc  all:main  main:main.o subdirs         cc $(target_list) -o $@ $(cflags)  subdirs: $(patsubst %, _dir_%, $(subdirs))  $(patsubst %, _dir_%, $(subdirs)) :         $(make) -c $(patsubst _dir_%, %, $@) $(tgt)

the rules.make:

all:$(target)  %.o:%.c         @echo $(target_list)         $(cc) -c $^ -o $@ $(cflags) $(ldflags)

the subdir makefile:

target := a.o target_list += $(target) cflags :=  ldflags :=   include $(top_dir)/rules.make

do favour, , use high-level build system if can. better hand-written makefiles. e.g. cmake, scons or waf of more popular alternatives.


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