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 ifndef NOISY
  30 .SILENT:
  31 endif
  32
  33 # Search for the build directory
  34 ifdef BUILD
  35 BUILD_POSSIBLE := $(BUILD) $(BASE)/$(BUILD)
  36 else
  37 BUILD_POSSIBLE := $(BASE) $(BASE)/build
  38 endif
  39
  40 BUILDX:= $(foreach i,$(BUILD_POSSIBLE),$(wildcard $(i)/environment.mak*))
  41 BUILDX:= $(patsubst %/,%,$(firstword $(dir $(BUILDX))))
  42
  43 ifeq ($(words $(BUILDX)),0)
  44 error-all:
  45         echo Can't find the build directory in $(BUILD_POSSIBLE) -- use BUILD=
  46 endif
  47
  48 override BUILD := $(BUILDX)
  49
  50 # Base definitions
  51 INCLUDE := $(BUILD)/include
  52 BIN := $(BUILD)/bin
  53 LIB := $(BIN)
  54 OBJ := $(BUILD)/obj/$(SUBDIR)
  55 DEP := $(OBJ)
  56 DOC := $(BUILD)/docs
  57
  58 # Module types
  59 LIBRARY_H = $(BASE)/buildlib/library.mak
  60 DEBIANDOC_H = $(BASE)/buildlib/debiandoc.mak
  61 MANPAGE_H = $(BASE)/buildlib/manpage.mak
  62 PROGRAM_H = $(BASE)/buildlib/program.mak
  63
  64 # Source location control
  65 # SUBDIRS specifies sub components of the module that
  66 # may be located in subdrictories of the source dir.
  67 # This should be declared before including this file
  68 SUBDIRS+=
  69
  70 # Header file control.
  71 # TARGETDIRS indicitates all of the locations that public headers
  72 # will be published to.
  73 # This should be declared before including this file
  74 HEADER_TARGETDIRS+=
  75
  76 # Options
  77 include $(BUILD)/environment.mak
  78 CPPFLAGS+= -I$(INCLUDE)
  79 LDFLAGS+= -L$(LIB)
  80
  81 # Phony rules. Other things hook these by appending to the dependency
  82 # list
  83 .PHONY: headers library clean veryclean all binary program doc
  84 .PHONY: maintainer-clean dist-clean distclean pristine sanity
  85 all: binary doc
  86 binary: library program
  87 maintainer-clean dist-clean distclean pristine sanity: veryclean
  88 headers library clean veryclean program:
  89
  90 # Header file control. We want all published interface headers to go
  91 # into the build directory from thier source dirs. We setup some
  92 # search paths here
  93 vpath %.h $(SUBDIRS)
  94 $(INCLUDE)/%.h $(addprefix $(INCLUDE)/,$(addsuffix /%.h,$(HEADER_TARGETDIRS))) : %.h
  95         cp $< $@
  96
  97 # Dependency generation. We want to generate a .d file using gnu cpp.
  98 # For GNU systems the compiler can spit out a .d file while it is compiling,
  99 # this is specified with the INLINEDEPFLAG. Other systems might have a
 100 # makedep program that can be called after compiling, that's illistrated
 101 # by the DEPFLAG case.
 102 # Compile rules are expected to call this macro after calling the compiler
 103 ifdef INLINEDEPFLAG
 104  define DoDep
 105         sed -e "1s/.*:/$(subst /,\\/,$@):/" $(basename $(@F)).d > $(DEP)/$(basename $(@F)).d
 106         -rm -f $(basename $(@F)).d
 107  endef
 108 else
 109  ifdef DEPFLAG
 110   define DoDep
 111         $(CXX) $(DEPFLAG) $(CPPFLAGS) -o $@ $<
 112         sed -e "1s/.*:/$(subst /,\\/,$@):/" $(basename $(@F)).d > $(DEP)/$(basename $(@F)).d
 113         -rm -f $(basename $(@F)).d
 114   endef
 115  else
 116   define DoDep
 117   endef
 118  endif
 119 endif