c - Non recursive makefile for manu sources directories with flat .obj directory -


i have project many sources directories. there requirement hold .obj files in 1 flat directory, e.g.

  • src1
  • src2
  • src3
    • src4
    • src5
      • src6
      • src7
  • src8
  • obj
  • makefile

i have list of sources files directories located in. make version 3.81 have used mixed implicit , normal rules make 3.82 cannot accomplish this. goal not use shell commands make built-in functions.

objects = $(subst .c,.o,$(srcs)) objects_obj = $(patsubst %.c,$(obj_dir)/%.o,$(notdir $(srcs)))  srcdir = $(dir $(srcs))  vpath %.c $(srcdir)     ...  $(obj_dir) $(obj_dir)/%.o : %.c     @echo "======================================================================="     @echo "compilation:" $< " --> " $@     @echo "======================================================================="     @mkdir -p $(dir $@)     $(cc) $(c_flags) $(incl) $< -c -o $@

where srcs list of sources files.

is possible achieve without recursive makefiles or without using shell commands.

simply include makefile create explicit dependencies:

# makefile obj_dir:=objects src_files := $(notdir $(srcs))  all: $(src_files:%.c=$(obj_dir)/%.o)  tmp_srcs := $(srcs)  include $(foreach dummy, $(srcs), object_rule.mk)  $(obj_dir)/.sentinel:     mkdir -p $(dir $@) && touch $@

the trick in combination of include statement , foreach. foreach generate many "object_rule.mk" there files listed in srcs. included makefile, object_rule.mk generates object rule corresponding source file this:

ifeq (,$(tmp_srcs)) $(error makefile requires variable tmp_srcs set) endif  src_path:=$(word 1, $(tmp_srcs)) ifeq (1, $(words $(tmp_srcs))) tmp_srcs:= else tmp_srcs:=$(wordlist 2, $(words $(tmp_srcs)), $(tmp_srcs)) endif  src_file:=$(notdir $(src_path)) obj_file:=$(src_file:%.c=%.o)  $(obj_dir)/$(obj_file): $(src_path) $(obj_dir)/.sentinel         $(cc) $(c_flags) $(incl) $< -c -o $@

note have added dependency $(obj_dir)/.sentinel correct , accurate dependencies.

this solution doesn't need hand crafted. use gnu make standard library


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