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 ($(V),1)
  15   quiet =
  16   Q =
  17 else
  18   quiet=quiet_
  19   Q=@
  20 endif
  21
  22 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  23   quiet=silent_
  24 endif
  25
  26 build-dir := $(srctree)/tools/build
  27
  28 # Define $(fixdep) for dep-cmd function
  29 ifeq ($(OUTPUT),)
  30   fixdep := $(build-dir)/fixdep
  31 else
  32   fixdep := $(OUTPUT)/fixdep
  33 endif
  34
  35 # Generic definitions
  36 include $(build-dir)/Build.include
  37
  38 # do not force detected configuration
  39 -include $(OUTPUT).config-detected
  40
  41 # Init all relevant variables used in build files so
  42 # 1) they have correct type
  43 # 2) they do not inherit any value from the environment
  44 subdir-y     :=
  45 obj-y        :=
  46 subdir-y     :=
  47 subdir-obj-y :=
  48
  49 # Build definitions
  50 build-file := $(dir)/Build
  51 -include $(build-file)
  52
  53 quiet_cmd_flex  = FLEX     $@
  54 quiet_cmd_bison = BISON    $@
  55
  56 # Create directory unless it exists
  57 quiet_cmd_mkdir = MKDIR    $(dir $@)
  58       cmd_mkdir = mkdir -p $(dir $@)
  59      rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
  60
  61 # Compile command
  62 quiet_cmd_cc_o_c = CC       $@
  63       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  64
  65 quiet_cmd_host_cc_o_c = HOSTCC   $@
  66       cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
  67
  68 quiet_cmd_cxx_o_c = CXX      $@
  69       cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
  70
  71 quiet_cmd_cpp_i_c = CPP      $@
  72       cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
  73
  74 quiet_cmd_cc_s_c = AS       $@
  75       cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
  76
  77 quiet_cmd_gen = GEN      $@
  78
  79 # Link agregate command
  80 # If there's nothing to link, create empty $@ object.
  81 quiet_cmd_ld_multi = LD       $@
  82       cmd_ld_multi = $(if $(strip $(obj-y)),\
  83                      $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
  84
  85 quiet_cmd_host_ld_multi = HOSTLD   $@
  86       cmd_host_ld_multi = $(if $(strip $(obj-y)),\
  87                           $(HOSTLD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
  88
  89 ifneq ($(filter $(obj),$(hostprogs)),)
  90   host = host_
  91 endif
  92
  93 # Build rules
  94 $(OUTPUT)%.o: %.c FORCE
  95         $(call rule_mkdir)
  96         $(call if_changed_dep,$(host)cc_o_c)
  97
  98 $(OUTPUT)%.o: %.cpp FORCE
  99         $(call rule_mkdir)
 100         $(call if_changed_dep,cxx_o_c)
 101
 102 $(OUTPUT)%.o: %.S FORCE
 103         $(call rule_mkdir)
 104         $(call if_changed_dep,$(host)cc_o_c)
 105
 106 $(OUTPUT)%.i: %.c FORCE
 107         $(call rule_mkdir)
 108         $(call if_changed_dep,cpp_i_c)
 109
 110 $(OUTPUT)%.s: %.S FORCE
 111         $(call rule_mkdir)
 112         $(call if_changed_dep,cpp_i_c)
 113
 114 $(OUTPUT)%.s: %.c FORCE
 115         $(call rule_mkdir)
 116         $(call if_changed_dep,cc_s_c)
 117
 118 # Gather build data:
 119 #   obj-y        - list of build objects
 120 #   subdir-y     - list of directories to nest
 121 #   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
 122 obj-y        := $($(obj)-y)
 123 subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
 124 obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
 125 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
 126
 127 # '$(OUTPUT)/dir' prefix to all objects
 128 objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
 129 obj-y        := $(addprefix $(objprefix),$(obj-y))
 130 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
 131
 132 # Final '$(obj)-in.o' object
 133 in-target := $(objprefix)$(obj)-in.o
 134
 135 PHONY += $(subdir-y)
 136
 137 $(subdir-y):
 138         $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
 139
 140 $(sort $(subdir-obj-y)): $(subdir-y) ;
 141
 142 $(in-target): $(obj-y) FORCE
 143         $(call rule_mkdir)
 144         $(call if_changed,$(host)ld_multi)
 145
 146 __build: $(in-target)
 147         @:
 148
 149 PHONY += FORCE
 150 FORCE:
 151
 152 # Include all cmd files to get all the dependency rules
 153 # for all objects included
 154 targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
 155 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 156
 157 ifneq ($(cmd_files),)
 158   include $(cmd_files)
 159 endif
 160
 161 .PHONY: $(PHONY)