tools/build/Makefile.build

0001 # SPDX-License-Identifier: GPL-2.0
0002 ###
0003 # Main build makefile.
0004 #
0005 #  Lots of this code have been borrowed or heavily inspired from parts
0006 #  of kbuild code, which is not credited, but mostly developed by:
0007 #
0008 #  Copyright (C) Sam Ravnborg <sam@mars.ravnborg.org>, 2015
0009 #  Copyright (C) Linus Torvalds <torvalds@linux-foundation.org>, 2015
0010 #
0011
0012 PHONY := __build
0013 __build:
0014
0015 ifeq ($(V),1)
0016   quiet =
0017   Q =
0018 else
0019   quiet=quiet_
0020   Q=@
0021 endif
0022
0023 ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),)
0024   quiet=silent_
0025 endif
0026
0027 build-dir := $(srctree)/tools/build
0028
0029 # Define $(fixdep) for dep-cmd function
0030 ifeq ($(OUTPUT),)
0031   fixdep := $(build-dir)/fixdep
0032 else
0033   fixdep := $(OUTPUT)/fixdep
0034 endif
0035
0036 # Generic definitions
0037 include $(build-dir)/Build.include
0038
0039 # do not force detected configuration
0040 -include $(OUTPUT).config-detected
0041
0042 # Init all relevant variables used in build files so
0043 # 1) they have correct type
0044 # 2) they do not inherit any value from the environment
0045 subdir-y     :=
0046 obj-y        :=
0047 subdir-y     :=
0048 subdir-obj-y :=
0049
0050 # Build definitions
0051 build-file := $(dir)/Build
0052 -include $(build-file)
0053
0054 quiet_cmd_flex  = FLEX    $@
0055 quiet_cmd_bison = BISON   $@
0056
0057 # Create directory unless it exists
0058 quiet_cmd_mkdir = MKDIR   $(dir $@)
0059       cmd_mkdir = mkdir -p $(dir $@)
0060      rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir))
0061
0062 # Compile command
0063 quiet_cmd_cc_o_c = CC      $@
0064       cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
0065
0066 quiet_cmd_host_cc_o_c = HOSTCC  $@
0067       cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $<
0068
0069 quiet_cmd_cxx_o_c = CXX     $@
0070       cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $<
0071
0072 quiet_cmd_cpp_i_c = CPP     $@
0073       cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $<
0074
0075 quiet_cmd_cc_s_c = AS      $@
0076       cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
0077
0078 quiet_cmd_gen = GEN     $@
0079
0080 # Link agregate command
0081 # If there's nothing to link, create empty $@ object.
0082 quiet_cmd_ld_multi = LD      $@
0083       cmd_ld_multi = $(if $(strip $(obj-y)),\
0084                      $(LD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@)
0085
0086 quiet_cmd_host_ld_multi = HOSTLD  $@
0087       cmd_host_ld_multi = $(if $(strip $(obj-y)),\
0088                           $(HOSTLD) -r -o $@  $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@)
0089
0090 ifneq ($(filter $(obj),$(hostprogs)),)
0091   host = host_
0092 endif
0093
0094 # Build rules
0095 $(OUTPUT)%.o: %.c FORCE
0096         $(call rule_mkdir)
0097         $(call if_changed_dep,$(host)cc_o_c)
0098
0099 $(OUTPUT)%.o: %.cpp FORCE
0100         $(call rule_mkdir)
0101         $(call if_changed_dep,cxx_o_c)
0102
0103 $(OUTPUT)%.o: %.S FORCE
0104         $(call rule_mkdir)
0105         $(call if_changed_dep,$(host)cc_o_c)
0106
0107 $(OUTPUT)%.i: %.c FORCE
0108         $(call rule_mkdir)
0109         $(call if_changed_dep,cpp_i_c)
0110
0111 $(OUTPUT)%.s: %.S FORCE
0112         $(call rule_mkdir)
0113         $(call if_changed_dep,cpp_i_c)
0114
0115 $(OUTPUT)%.s: %.c FORCE
0116         $(call rule_mkdir)
0117         $(call if_changed_dep,cc_s_c)
0118
0119 # Gather build data:
0120 #   obj-y        - list of build objects
0121 #   subdir-y     - list of directories to nest
0122 #   subdir-obj-y - list of directories objects 'dir/$(obj)-in.o'
0123 obj-y        := $($(obj)-y)
0124 subdir-y     := $(patsubst %/,%,$(filter %/, $(obj-y)))
0125 obj-y        := $(patsubst %/, %/$(obj)-in.o, $(obj-y))
0126 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y))
0127
0128 # '$(OUTPUT)/dir' prefix to all objects
0129 objprefix    := $(subst ./,,$(OUTPUT)$(dir)/)
0130 obj-y        := $(addprefix $(objprefix),$(obj-y))
0131 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y))
0132
0133 # Final '$(obj)-in.o' object
0134 in-target := $(objprefix)$(obj)-in.o
0135
0136 PHONY += $(subdir-y)
0137
0138 $(subdir-y):
0139         $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj)
0140
0141 $(sort $(subdir-obj-y)): $(subdir-y) ;
0142
0143 $(in-target): $(obj-y) FORCE
0144         $(call rule_mkdir)
0145         $(call if_changed,$(host)ld_multi)
0146
0147 __build: $(in-target)
0148         @:
0149
0150 PHONY += FORCE
0151 FORCE:
0152
0153 # Include all cmd files to get all the dependency rules
0154 # for all objects included
0155 targets   := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS)))
0156 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
0157
0158 ifneq ($(cmd_files),)
0159   include $(cmd_files)
0160 endif
0161
0162 .PHONY: $(PHONY)