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 := reader store alien typeregister textmodel fold typepath
   8
   9 CFLAGS += -I.
  10
  11 # Variables for the modules to write to
  12 SRCS := odcread.cc
  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). It first builds a
  22 # dependency (.d) file which will ensure that the .o is rebuilt whenever the
  23 # header files included by the .cc are updated.
  24 # The options given to GCC for this are as follows:
  25 #  -MM : calculate dependencies, but exclude system headers
  26 #  -MF : output dependencies to the given file
  27 #  -MP : generate "header.h:" rules to avoid errors on deletion of headers
  28 #  -MT : the main rule has the given target (to handle subdirs correctly)
  29 # The .d file is not an explicit target because it will need to be (re-)built
  30 # if and only if the .o needs to be rebuilt.
  31 %.o: %.cc
  32         g++ $(CFLAGS) $< -MM -MF $*.d -MP -MT $@
  33         g++ $(CFLAGS) $< -c -o $@
  34
  35 clean:
  36         rm -f odcread *.d *.o */*.o */*.d
  37
  38 # Include the generated dependency files (if they exist)
  39 -include $(SRCS:.cc=.d)
  40
  41
  42 # TODO:
  43 # Each module has a .ih file that should be *the only* include from the .cc
  44 # files. These .ih files should be pre-compiled, and dependency caching should
  45 # be based on the .ih files, not the .cc files.