tools/build/Makefile.build

   1 ###
   2 # Main build makefile.
   3 #
   4 #  Lots of this code have been borrowed or heavily inspired from parts
   5 #  of kbuild code, which is not credited, but mostly developed by:
   6 #
   7 #  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
   8 #  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
   9 #
  10
  11 PHONY := __build
  12 __build:
  13
  14 ifeq ($(V),1)
  15   quiet =
  16   Q =
  17 else
  18   quiet=quiet_
  19   Q=@
  20 endif
  21
  22 build-dir := $(srctree)/tools/build
  23
  24 # Define $(fixdep) for dep-cmd function
  25 ifeq ($(OUTPUT),)
  26   fixdep := $(build-dir)/fixdep
  27 else
  28   fixdep := $(OUTPUT)/fixdep
  29 endif
  30
  31 # Generic definitions
  32 include $(build-dir)/Build.include
  33
  34 # do not force detected configuration
  35 -include $(OUTPUT).config-detected
  36
  37 # Init all relevant variables used in build files so
  38 # 1) they have correct type
  39 # 2) they do not inherit any value from the environment
  40 subdir-y     :=
  41 obj-y        :=
  42 subdir-y     :=
  43 subdir-obj-y :=
  44
  45 # Build definitions
  46 build-file := $(dir)/Build
  47 -include $(build-file)
  48
  49 quiet_cmd_flex  = FLEX     $@
  50 quiet_cmd_bison = BISON    $@
  51
  52 # Create directory unless it exists
  53 quiet_cmd_mkdir = MKDIR    $(dir $@)
  54       cmd_mkdir = mkdir -p $(dir $@)
  55      rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
  56
  57 # Compile command
  58 quiet_cmd_cc_o_c = CC       $@
  59       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  60
  61 quiet_cmd_host_cc_o_c = HOSTCC   $@
  62       cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
  63
  64 quiet_cmd_cxx_o_c = CXX      $@
  65       cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
  66
  67 quiet_cmd_cpp_i_c = CPP      $@
  68       cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
  69
  70 quiet_cmd_cc_s_c = AS       $@
  71       cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
  72
  73 quiet_cmd_gen = GEN      $@
  74
  75 # Link agregate command
  76 # If there's nothing to link, create empty $@ object.
  77 quiet_cmd_ld_multi = LD       $@
  78       cmd_ld_multi = $(if $(strip $(obj-y)),\
  79                      $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
  80
  81 quiet_cmd_host_ld_multi = HOSTLD   $@
  82       cmd_host_ld_multi = $(if $(strip $(obj-y)),\
  83                           $(HOSTLD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
  84
  85 ifneq ($(filter $(obj),$(hostprogs)),)
  86   host = host_
  87 endif
  88
  89 # Build rules
  90 $(OUTPUT)%.o: %.c FORCE
  91         $(call rule_mkdir)
  92         $(call if_changed_dep,$(host)cc_o_c)
  93
  94 $(OUTPUT)%.o: %.cpp FORCE
  95         $(call rule_mkdir)
  96         $(call if_changed_dep,cxx_o_c)
  97
  98 $(OUTPUT)%.o: %.S FORCE
  99         $(call rule_mkdir)
 100         $(call if_changed_dep,$(host)cc_o_c)
 101
 102 $(OUTPUT)%.i: %.c FORCE
 103         $(call rule_mkdir)
 104         $(call if_changed_dep,cpp_i_c)
 105
 106 $(OUTPUT)%.s: %.S FORCE
 107         $(call rule_mkdir)
 108         $(call if_changed_dep,cpp_i_c)
 109
 110 $(OUTPUT)%.s: %.c FORCE
 111         $(call rule_mkdir)
 112         $(call if_changed_dep,cc_s_c)
 113
 114 # Gather build data:
 115 #   obj-y        - list of build objects
 116 #   subdir-y     - list of directories to nest
 117 #   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
 118 obj-y        := $($(obj)-y)
 119 subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
 120 obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
 121 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
 122
 123 # '$(OUTPUT)/dir' prefix to all objects
 124 objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
 125 obj-y        := $(addprefix $(objprefix),$(obj-y))
 126 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
 127
 128 # Final '$(obj)-in.o' object
 129 in-target := $(objprefix)$(obj)-in.o
 130
 131 PHONY += $(subdir-y)
 132
 133 $(subdir-y):
 134         $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
 135
 136 $(sort $(subdir-obj-y)): $(subdir-y) ;
 137
 138 $(in-target): $(obj-y) FORCE
 139         $(call rule_mkdir)
 140         $(call if_changed,$(host)ld_multi)
 141
 142 __build: $(in-target)
 143         @:
 144
 145 PHONY += FORCE
 146 FORCE:
 147
 148 # Include all cmd files to get all the dependency rules
 149 # for all objects included
 150 targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
 151 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 152
 153 ifneq ($(cmd_files),)
 154   include $(cmd_files)
 155 endif
 156
 157 .PHONY: $(PHONY)