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