buildlib/defaults.mak

   1 # -*- make -*-
   2
   3 # This file configures the default environment for the make system
   4 # The way it works is fairly simple, each module is defined in it's
   5 # own *.mak file. It expects a set of variables to be set to values
   6 # for it to operate as expected. When included the module generates
   7 # the requested rules based on the contents of its control variables.
   8
   9 # This works out very well and allows a good degree of flexability.
  10 # To accomidate some of the features we introduce the concept of
  11 # local variables. To do this we use the 'Computed Names' feature of
  12 # gmake. Each module declares a LOCAL scope and access it with,
  13 #   $($(LOCAL)-VAR)
  14 # This works very well but it is important to rembember that within
  15 # a rule the LOCAL var is unavailble, it will have to be constructed
  16 # from the information in the rule invokation. For stock rules like
  17 # clean this is simple, we use a local clean rule called clean/$(LOCAL)
  18 # and then within the rule $(@F) gets back $(LOCAL)! Other rules will
  19 # have to use some other mechanism (filter perhaps?) The reason such
  20 # lengths are used is so that each directory can contain several 'instances'
  21 # of any given module
  22
  23 # A build directory is used by default, all generated items get put into
  24 # there. However unlike automake this is not done with a VPATH build
  25 # (vpath builds break the distinction between #include "" and #include <>)
  26 # but by explicly setting the BUILD variable. Make is invoked from
  27 # within the source itself which is much more compatible with compilation
  28 # environments.
  29 .SILENT:
  30
  31 # Search for the build directory
  32 ifdef BUILD
  33 BUILD_POSSIBLE = $(BUILD)
  34 else
  35 BUILD_POSSIBLE = $(BASE) $(BASE)/build
  36 endif
  37
  38 BUILD:= $(foreach i,$(BUILD_POSSIBLE),$(wildcard $(i)/environment.mak))
  39 BUILD:= $(firstword $(dir $(BUILD)))
  40
  41 ifeq ($(words $(BUILD)),0)
  42 error-all:
  43         echo Can't find the build directory in $(BUILD_POSSIBLE) -- use BUILD=
  44 endif
  45
  46 # Base definitions
  47 INCLUDE := $(BUILD)/include
  48 BIN := $(BUILD)/bin
  49 LIB := $(BIN)
  50 OBJ := $(BUILD)/obj
  51 DEP := $(OBJ)
  52 DOC := $(BUILD)/doc
  53
  54 # Module types
  55 LIBRARY_H = $(BASE)/buildlib/library.mak
  56 DEBIANDOC_H = $(BASE)/buildlib/debiandoc.mak
  57 MANPAGE_H = $(BASE)/buildlib/manpage.mak
  58
  59 # Source location control
  60 # SUBDIRS specifies sub components of the module that
  61 # may be located in subdrictories of the source dir.
  62 # This should be declared before including this file
  63 SUBDIRS+=
  64
  65 # Header file control.
  66 # TARGETDIRS indicitates all of the locations that public headers
  67 # will be published to.
  68 # This should be declared before including this file
  69 HEADER_TARGETDIRS+=
  70
  71 # Options
  72 include $(BUILD)/environment.mak
  73 CPPFLAGS+= -I$(BUILD)/include
  74
  75 # Phony rules. Other things hook these by appending to the dependency
  76 # list
  77 .PHONY: headers library clean veryclean all binary program doc
  78 all: binary doc
  79 binary: library program
  80 maintainer-clean dist-clean: veryclean
  81 headers library clean veryclean program:
  82
  83 # Header file control. We want all published interface headers to go
  84 # into the build directory from thier source dirs. We setup some
  85 # search paths here
  86 vpath %.h $(SUBDIRS)
  87 $(INCLUDE)/%.h $(addprefix $(INCLUDE)/,$(addsuffix /%.h,$(HEADER_TARGETDIRS))) : %.h
  88         cp $< $@
  89
  90 # Dependency generation. We want to generate a .d file using gnu cpp.
  91 # For GNU systems the compiler can spit out a .d file while it is compiling,
  92 # this is specified with the INLINEDEPFLAG. Other systems might have a
  93 # makedep program that can be called after compiling, that's illistrated
  94 # by the DEPFLAG case.
  95 # Compile rules are expected to call this macro after calling the compiler
  96  ifdef INLINEDEPFLAG
  97  define DoDep
  98         sed -e "1s/.*:/$(subst /,\\/,$@):/" $(basename $(@F)).d > $(DEP)/$(basename $(@F)).d
  99         -rm -f $(basename $(@F)).d
 100  endef
 101 else
 102  ifdef DEPFLAG
 103   define DoDep
 104         $(CXX) $(DEPFLAG) $(CPPFLAGS) -o $@ $<
 105         sed -e "1s/.*:/$(subst /,\\/,$@):/" $(basename $(@F)).d > $(DEP)/$(basename $(@F)).d
 106         -rm -f $(basename $(@F)).d
 107   endef
 108  else
 109   define DoDep
 110   endef
 111  endif
 112 endif