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 12 PHONY := __build 13 __build: 14 15 ifeq ($(V),1) 16 quiet = 17 Q = 18 else 19 quiet=quiet_ 20 Q=@ 21 endif 22 23 # If the user is running make -s (silent mode), suppress echoing of commands 24 # make-4.0 (and later) keep single letter options in the 1st word of MAKEFLAGS. 25 ifeq ($(filter 3.%,$(MAKE_VERSION)),) 26 short-opts := $(firstword -$(MAKEFLAGS)) 27 else 28 short-opts := $(filter-out --%,$(MAKEFLAGS)) 29 endif 30 31 ifneq ($(findstring s,$(short-opts)),) 32 quiet=silent_ 33 endif 34 35 build-dir := $(srctree)/tools/build 36 37 # Define $(fixdep) for dep-cmd function 38 ifeq ($(OUTPUT),) 39 fixdep := $(build-dir)/fixdep 40 else 41 fixdep := $(OUTPUT)/fixdep 42 endif 43 44 # Generic definitions 45 include $(build-dir)/Build.include 46 47 # do not force detected configuration 48 -include $(OUTPUT).config-detected 49 50 # Init all relevant variables used in build files so 51 # 1) they have correct type 52 # 2) they do not inherit any value from the environment 53 subdir-y := 54 obj-y := 55 subdir-y := 56 subdir-obj-y := 57 58 # Build definitions 59 build-file := $(dir)/Build 60 -include $(build-file) 61 62 quiet_cmd_flex = FLEX $@ 63 quiet_cmd_bison = BISON $@ 64 quiet_cmd_test = TEST $@ 65 66 # Create directory unless it exists 67 quiet_cmd_mkdir = MKDIR $(dir $@) 68 cmd_mkdir = mkdir -p $(dir $@) 69 rule_mkdir = $(if $(wildcard $(dir $@)),,@$(call echo-cmd,mkdir) $(cmd_mkdir)) 70 71 # Compile command 72 quiet_cmd_cc_o_c = CC $@ 73 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< 74 75 quiet_cmd_host_cc_o_c = HOSTCC $@ 76 cmd_host_cc_o_c = $(HOSTCC) $(host_c_flags) -c -o $@ $< 77 78 quiet_cmd_cxx_o_c = CXX $@ 79 cmd_cxx_o_c = $(CXX) $(cxx_flags) -c -o $@ $< 80 81 quiet_cmd_cpp_i_c = CPP $@ 82 cmd_cpp_i_c = $(CC) $(c_flags) -E -o $@ $< 83 84 quiet_cmd_cc_s_c = AS $@ 85 cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $< 86 87 quiet_cmd_gen = GEN $@ 88 89 # Link agregate command 90 # If there's nothing to link, create empty $@ object. 91 quiet_cmd_ld_multi = LD $@ 92 cmd_ld_multi = $(if $(strip $(obj-y)),\ 93 $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(AR) rcs $@) 94 95 quiet_cmd_host_ld_multi = HOSTLD $@ 96 cmd_host_ld_multi = $(if $(strip $(obj-y)),\ 97 $(HOSTLD) -r -o $@ $(filter $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@) 98 99 ifneq ($(filter $(obj),$(hostprogs)),) 100 host = host_ 101 endif 102 103 # Build rules 104 $(OUTPUT)%.o: %.c FORCE 105 $(call rule_mkdir) 106 $(call if_changed_dep,$(host)cc_o_c) 107 108 $(OUTPUT)%.o: %.cpp FORCE 109 $(call rule_mkdir) 110 $(call if_changed_dep,cxx_o_c) 111 112 $(OUTPUT)%.o: %.S FORCE 113 $(call rule_mkdir) 114 $(call if_changed_dep,$(host)cc_o_c) 115 116 $(OUTPUT)%.i: %.c FORCE 117 $(call rule_mkdir) 118 $(call if_changed_dep,cpp_i_c) 119 120 $(OUTPUT)%.s: %.S FORCE 121 $(call rule_mkdir) 122 $(call if_changed_dep,cpp_i_c) 123 124 $(OUTPUT)%.s: %.c FORCE 125 $(call rule_mkdir) 126 $(call if_changed_dep,cc_s_c) 127 128 # bison and flex files are generated in the OUTPUT directory 129 # so it needs a separate rule to depend on them properly 130 $(OUTPUT)%-bison.o: $(OUTPUT)%-bison.c FORCE 131 $(call rule_mkdir) 132 $(call if_changed_dep,$(host)cc_o_c) 133 134 $(OUTPUT)%-flex.o: $(OUTPUT)%-flex.c FORCE 135 $(call rule_mkdir) 136 $(call if_changed_dep,$(host)cc_o_c) 137 138 # Gather build data: 139 # obj-y - list of build objects 140 # subdir-y - list of directories to nest 141 # subdir-obj-y - list of directories objects 'dir/$(obj)-in.o' 142 obj-y := $($(obj)-y) 143 subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 144 obj-y := $(patsubst %/, %/$(obj)-in.o, $(obj-y)) 145 subdir-obj-y := $(filter %/$(obj)-in.o, $(obj-y)) 146 147 # '$(OUTPUT)/dir' prefix to all objects 148 objprefix := $(subst ./,,$(OUTPUT)$(dir)/) 149 obj-y := $(addprefix $(objprefix),$(obj-y)) 150 subdir-obj-y := $(addprefix $(objprefix),$(subdir-obj-y)) 151 152 # Final '$(obj)-in.o' object 153 in-target := $(objprefix)$(obj)-in.o 154 155 PHONY += $(subdir-y) 156 157 $(subdir-y): 158 $(Q)$(MAKE) -f $(build-dir)/Makefile.build dir=$(dir)/$@ obj=$(obj) 159 160 $(sort $(subdir-obj-y)): $(subdir-y) ; 161 162 $(in-target): $(obj-y) FORCE 163 $(call rule_mkdir) 164 $(call if_changed,$(host)ld_multi) 165 166 __build: $(in-target) 167 @: 168 169 PHONY += FORCE 170 FORCE: 171 172 # Include all cmd files to get all the dependency rules 173 # for all objects included 174 targets := $(wildcard $(sort $(obj-y) $(in-target) $(MAKECMDGOALS))) 175 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) 176 177 ifneq ($(cmd_files),) 178 include $(cmd_files) 179 endif 180 181 .PHONY: $(PHONY)
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