Makefile.build 3.9 KB

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  1. # SPDX-License-Identifier: GPL-2.0
  2. ###
  3. # Main build makefile.
  4. #
  5. # Lots of this code have been borrowed or heavily inspired from parts
  6. # of kbuild code, which is not credited, but mostly developed by:
  7. #
  8. # Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
  9. # Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
  10. #
  11. PHONY := __build
  12. __build:
  13. ifeq ($(V),1)
  14. quiet =
  15. Q =
  16. else
  17. quiet=quiet_
  18. Q=@
  19. endif
  20. ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
  21. quiet=silent_
  22. endif
  23. build-dir := $(srctree)/tools/build
  24. # Define $(fixdep) for dep-cmd function
  25. ifeq ($(OUTPUT),)
  26. fixdep := $(build-dir)/fixdep
  27. else
  28. fixdep := $(OUTPUT)/fixdep
  29. endif
  30. # Generic definitions
  31. include $(build-dir)/Build.include
  32. # do not force detected configuration
  33. -include $(OUTPUT).config-detected
  34. # Init all relevant variables used in build files so
  35. # 1) they have correct type
  36. # 2) they do not inherit any value from the environment
  37. subdir-y :=
  38. obj-y :=
  39. subdir-y :=
  40. subdir-obj-y :=
  41. # Build definitions
  42. build-file := $(dir)/Build
  43. -include $(build-file)
  44. quiet_cmd_flex = FLEX $@
  45. quiet_cmd_bison = BISON $@
  46. # Create directory unless it exists
  47. quiet_cmd_mkdir = MKDIR $(dir $@)
  48. cmd_mkdir = mkdir -p $(dir $@)
  49. rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
  50. # Compile command
  51. quiet_cmd_cc_o_c = CC $@
  52. cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
  53. quiet_cmd_host_cc_o_c = HOSTCC $@
  54. cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
  55. quiet_cmd_cxx_o_c = CXX $@
  56. cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
  57. quiet_cmd_cpp_i_c = CPP $@
  58. cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
  59. quiet_cmd_cc_s_c = AS $@
  60. cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
  61. quiet_cmd_gen = GEN $@
  62. # Link agregate command
  63. # If there's nothing to link, create empty $@ object.
  64. quiet_cmd_ld_multi = LD $@
  65. cmd_ld_multi = $(if $(strip $(obj-y)),\
  66. $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
  67. quiet_cmd_host_ld_multi = HOSTLD $@
  68. cmd_host_ld_multi = $(if $(strip $(obj-y)),\
  69. $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
  70. ifneq ($(filter $(obj),$(hostprogs)),)
  71. host = host_
  72. endif
  73. # Build rules
  74. $(OUTPUT)%.o: %.c FORCE
  75. $(call rule_mkdir)
  76. $(call if_changed_dep,$(host)cc_o_c)
  77. $(OUTPUT)%.o: %.cpp FORCE
  78. $(call rule_mkdir)
  79. $(call if_changed_dep,cxx_o_c)
  80. $(OUTPUT)%.o: %.S FORCE
  81. $(call rule_mkdir)
  82. $(call if_changed_dep,$(host)cc_o_c)
  83. $(OUTPUT)%.i: %.c FORCE
  84. $(call rule_mkdir)
  85. $(call if_changed_dep,cpp_i_c)
  86. $(OUTPUT)%.s: %.S FORCE
  87. $(call rule_mkdir)
  88. $(call if_changed_dep,cpp_i_c)
  89. $(OUTPUT)%.s: %.c FORCE
  90. $(call rule_mkdir)
  91. $(call if_changed_dep,cc_s_c)
  92. # Gather build data:
  93. # obj-y - list of build objects
  94. # subdir-y - list of directories to nest
  95. # subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
  96. obj-y := $($(obj)-y)
  97. subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
  98. obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
  99. subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
  100. # '$(OUTPUT)/dir' prefix to all objects
  101. objprefix := $(subst ./,,$(OUTPUT)$(dir)/)
  102. obj-y := $(addprefix $(objprefix),$(obj-y))
  103. subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
  104. # Final '$(obj)-in.o' object
  105. in-target := $(objprefix)$(obj)-in.o
  106. PHONY += $(subdir-y)
  107. $(subdir-y):
  108. $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
  109. $(sort $(subdir-obj-y)): $(subdir-y) ;
  110. $(in-target): $(obj-y) FORCE
  111. $(call rule_mkdir)
  112. $(call if_changed,$(host)ld_multi)
  113. __build: $(in-target)
  114. @:
  115. PHONY += FORCE
  116. FORCE:
  117. # Include all cmd files to get all the dependency rules
  118. # for all objects included
  119. targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
  120. cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
  121. ifneq ($(cmd_files),)
  122. include $(cmd_files)
  123. endif
  124. .PHONY: $(PHONY)