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 ($(V),1)
  15   quiet =
  16   Q =
  17 else
  18   quiet=quiet_
  19   Q=@
  20 endif
  21
  22 ifneq ($(filter 4.%,$(MAKE_VERSION)),)  # make-4
  23 ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
  24   quiet=silent_
  25 endif
  26 else                                    # make-3.8x
  27 ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  28   quiet=silent_
  29 endif
  30 endif
  31
  32 build-dir := $(srctree)/tools/build
  33
  34 # Define $(fixdep) for dep-cmd function
  35 ifeq ($(OUTPUT),)
  36   fixdep := $(build-dir)/fixdep
  37 else
  38   fixdep := $(OUTPUT)/fixdep
  39 endif
  40
  41 # Generic definitions
  42 include $(build-dir)/Build.include
  43
  44 # do not force detected configuration
  45 -include $(OUTPUT).config-detected
  46
  47 # Init all relevant variables used in build files so
  48 # 1) they have correct type
  49 # 2) they do not inherit any value from the environment
  50 subdir-y     :=
  51 obj-y        :=
  52 subdir-y     :=
  53 subdir-obj-y :=
  54
  55 # Build definitions
  56 build-file := $(dir)/Build
  57 -include $(build-file)
  58
  59 quiet_cmd_flex  = FLEX     $@
  60 quiet_cmd_bison = BISON    $@
  61
  62 # Create directory unless it exists
  63 quiet_cmd_mkdir = MKDIR    $(dir $@)
  64       cmd_mkdir = mkdir -p $(dir $@)
  65      rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
  66
  67 # Compile command
  68 quiet_cmd_cc_o_c = CC       $@
  69       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  70
  71 quiet_cmd_host_cc_o_c = HOSTCC   $@
  72       cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
  73
  74 quiet_cmd_cxx_o_c = CXX      $@
  75       cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
  76
  77 quiet_cmd_cpp_i_c = CPP      $@
  78       cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
  79
  80 quiet_cmd_cc_s_c = AS       $@
  81       cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
  82
  83 quiet_cmd_gen = GEN      $@
  84
  85 # Link agregate command
  86 # If there's nothing to link, create empty $@ object.
  87 quiet_cmd_ld_multi = LD       $@
  88       cmd_ld_multi = $(if $(strip $(obj-y)),\
  89                      $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
  90
  91 quiet_cmd_host_ld_multi = HOSTLD   $@
  92       cmd_host_ld_multi = $(if $(strip $(obj-y)),\
  93                           $(HOSTLD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
  94
  95 ifneq ($(filter $(obj),$(hostprogs)),)
  96   host = host_
  97 endif
  98
  99 # Build rules
 100 $(OUTPUT)%.o: %.c FORCE
 101         $(call rule_mkdir)
 102         $(call if_changed_dep,$(host)cc_o_c)
 103
 104 $(OUTPUT)%.o: %.cpp FORCE
 105         $(call rule_mkdir)
 106         $(call if_changed_dep,cxx_o_c)
 107
 108 $(OUTPUT)%.o: %.S FORCE
 109         $(call rule_mkdir)
 110         $(call if_changed_dep,$(host)cc_o_c)
 111
 112 $(OUTPUT)%.i: %.c FORCE
 113         $(call rule_mkdir)
 114         $(call if_changed_dep,cpp_i_c)
 115
 116 $(OUTPUT)%.s: %.S FORCE
 117         $(call rule_mkdir)
 118         $(call if_changed_dep,cpp_i_c)
 119
 120 $(OUTPUT)%.s: %.c FORCE
 121         $(call rule_mkdir)
 122         $(call if_changed_dep,cc_s_c)
 123
 124 # Gather build data:
 125 #   obj-y        - list of build objects
 126 #   subdir-y     - list of directories to nest
 127 #   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
 128 obj-y        := $($(obj)-y)
 129 subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
 130 obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
 131 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
 132
 133 # '$(OUTPUT)/dir' prefix to all objects
 134 objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
 135 obj-y        := $(addprefix $(objprefix),$(obj-y))
 136 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
 137
 138 # Final '$(obj)-in.o' object
 139 in-target := $(objprefix)$(obj)-in.o
 140
 141 PHONY += $(subdir-y)
 142
 143 $(subdir-y):
 144         $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
 145
 146 $(sort $(subdir-obj-y)): $(subdir-y) ;
 147
 148 $(in-target): $(obj-y) FORCE
 149         $(call rule_mkdir)
 150         $(call if_changed,$(host)ld_multi)
 151
 152 __build: $(in-target)
 153         @:
 154
 155 PHONY += FORCE
 156 FORCE:
 157
 158 # Include all cmd files to get all the dependency rules
 159 # for all objects included
 160 targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
 161 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 162
 163 ifneq ($(cmd_files),)
 164   include $(cmd_files)
 165 endif
 166
 167 .PHONY: $(PHONY)