Makefile

   1 # Modules, each containing:
   2 #  * $(MODULE)/Make.inc -- makefile include
   3 #  * $(MODULE)/$(MODULE).h -- minimal "interface" header file
   4 #  * $(MODULE)/$(MODULE).ih -- internal/implementation header file
   5 #    (only to be included by sources within the module)
   6 #  * $(MODULE)/*.cc -- module source files
   7 MODULES := main reader store alien typeregister textmodel fold typepath
   8
   9 CFLAGS += -I.
  10
  11 # Variables for the modules to write to
  12 SRCS :=
  13
  14 # Include module definitions
  15 include $(patsubst %,%/Make.inc,$(MODULES))
  16
  17 # This rule just links the object files together
  18 odcread: $(SRCS:.cc=.o)
  19         g++ -o $@ $^
  20
  21 # This rule build an object (.o) from a source (.cc).
  22 %.o: %.cc
  23         g++ $(CFLAGS) $< -c -o $@
  24
  25 # For each implementation header (.ih) generate a dependency (.d) file which
  26 # will ensure that the compiled header (.ih.gch) is rebuilt whenever the header
  27 # files included by the .ih are updated.
  28 # The options given to GCC for this are as follows:
  29 #  -MM : calculate dependencies, but exclude system headers
  30 #  -MF : output dependencies to the given file
  31 #  -MP : generate "header.h:" rules to avoid errors on deletion of headers
  32 #  -MT : the main rule has the given target (to handle subdirs correctly)
  33 # The .d file is not an explicit target because it will need to be (re-)built
  34 # if and only if the .ih.gch needs to be rebuilt.
  35 %.ih.gch: %.ih
  36         g++ $(CFLAGS) -x c++-header $< -MM -MF $*.d -MP -MT $@
  37         g++ $(CFLAGS) -x c++-header $< -o $@
  38
  39 # Each module has a .ih file that should be *the only* include from the .cc
  40 # files. These .ih files are pre-compiled to .ih.gch, and dependency caching
  41 # is based on the .ih files, not the .cc files.
  42 define depend_on_compiled_header
  43 $(patsubst %.cc,%.o,$(1)) : $(dir $(1))module.ih.gch
  44 endef
  45 $(foreach src,$(SRCS),$(eval $(call depend_on_compiled_header,$(src))))
  46
  47 clean:
  48         rm -f */*.o */module.d */module.ih.gch
  49
  50 dist-clean: clean
  51         rm -f odcread
  52 # Include the generated dependency files (if they exist)
  53 -include $(patsubst %,%/module.d,$(MODULES))