| 1 | # SPDX-License-Identifier: GPL-2.0
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| 2 | # ==========================================================================
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| 3 | # Building
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| 4 | # ==========================================================================
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| 5 |
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| 6 | src := $(obj)
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| 7 |
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| 8 | PHONY := $(obj)/
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| 9 | $(obj)/:
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| 10 |
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| 11 | # Init all relevant variables used in kbuild files so
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| 12 | # 1) they have correct type
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| 13 | # 2) they do not inherit any value from the environment
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| 14 | obj-y :=
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| 15 | obj-m :=
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| 16 | lib-y :=
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| 17 | lib-m :=
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| 18 | always-y :=
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| 19 | always-m :=
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| 20 | targets :=
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| 21 | subdir-y :=
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| 22 | subdir-m :=
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| 23 | EXTRA_AFLAGS :=
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| 24 | EXTRA_CFLAGS :=
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| 25 | EXTRA_CPPFLAGS :=
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| 26 | EXTRA_LDFLAGS :=
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| 27 | asflags-y :=
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| 28 | ccflags-y :=
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| 29 | rustflags-y :=
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| 30 | cppflags-y :=
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| 31 | ldflags-y :=
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| 32 |
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| 33 | subdir-asflags-y :=
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| 34 | subdir-ccflags-y :=
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| 35 |
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| 36 | # Read auto.conf if it exists, otherwise ignore
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| 37 | -include include/config/auto.conf
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| 38 |
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| 39 | include $(srctree)/scripts/Kbuild.include
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| 40 | include $(srctree)/scripts/Makefile.compiler
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| 41 | include $(kbuild-file)
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| 42 | include $(srctree)/scripts/Makefile.lib
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| 43 |
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| 44 | # Do not include hostprogs rules unless needed.
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| 45 | # $(sort ...) is used here to remove duplicated words and excessive spaces.
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| 46 | hostprogs := $(sort $(hostprogs))
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| 47 | ifneq ($(hostprogs),)
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| 48 | include $(srctree)/scripts/Makefile.host
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| 49 | endif
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| 50 |
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| 51 | # Do not include userprogs rules unless needed.
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| 52 | # $(sort ...) is used here to remove duplicated words and excessive spaces.
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| 53 | userprogs := $(sort $(userprogs))
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| 54 | ifneq ($(userprogs),)
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| 55 | include $(srctree)/scripts/Makefile.userprogs
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| 56 | endif
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| 57 |
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| 58 | ifndef obj
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| 59 | $(warning kbuild: Makefile.build is included improperly)
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| 60 | endif
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| 61 |
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| 62 | ifeq ($(need-modorder),)
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| 63 | ifneq ($(obj-m),)
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| 64 | $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
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| 65 | $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
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| 66 | endif
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| 67 | endif
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| 68 |
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| 69 | # ===========================================================================
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| 70 |
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| 71 | # subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
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| 72 | subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
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| 73 | subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
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| 74 |
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| 75 | targets-for-builtin := $(extra-y)
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| 76 |
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| 77 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
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| 78 | targets-for-builtin += $(obj)/lib.a
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| 79 | endif
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| 80 |
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| 81 | ifdef need-builtin
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| 82 | targets-for-builtin += $(obj)/built-in.a
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| 83 | endif
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| 84 |
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| 85 | targets-for-modules := $(foreach x, o mod $(if $(CONFIG_TRIM_UNUSED_KSYMS), usyms), \
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| 86 | $(patsubst %.o, %.$x, $(filter %.o, $(obj-m))))
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| 87 |
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| 88 | ifdef need-modorder
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| 89 | targets-for-modules += $(obj)/modules.order
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| 90 | endif
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| 91 |
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| 92 | targets += $(targets-for-builtin) $(targets-for-modules)
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| 93 |
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| 94 | # Linus' kernel sanity checking tool
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| 95 | ifeq ($(KBUILD_CHECKSRC),1)
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| 96 | quiet_cmd_checksrc = CHECK $<
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| 97 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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| 98 | else ifeq ($(KBUILD_CHECKSRC),2)
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| 99 | quiet_cmd_force_checksrc = CHECK $<
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| 100 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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| 101 | endif
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| 102 |
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| 103 | ifneq ($(KBUILD_EXTRA_WARN),)
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| 104 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
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| 105 | endif
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| 106 |
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| 107 | # Compile C sources (.c)
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| 108 | # ---------------------------------------------------------------------------
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| 109 |
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| 110 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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| 111 | cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
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| 112 |
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| 113 | $(obj)/%.s: $(src)/%.c FORCE
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| 114 | $(call if_changed_dep,cc_s_c)
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| 115 |
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| 116 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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| 117 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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| 118 |
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| 119 | $(obj)/%.i: $(src)/%.c FORCE
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| 120 | $(call if_changed_dep,cpp_i_c)
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| 121 |
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| 122 | genksyms = scripts/genksyms/genksyms \
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| 123 | $(if $(1), -T $(2)) \
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| 124 | $(if $(KBUILD_PRESERVE), -p) \
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| 125 | -r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
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| 126 |
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| 127 | # These mirror gensymtypes_S and co below, keep them in synch.
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| 128 | cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
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| 129 |
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| 130 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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| 131 | cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@) >/dev/null
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| 132 |
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| 133 | $(obj)/%.symtypes : $(src)/%.c FORCE
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| 134 | $(call cmd,cc_symtypes_c)
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| 135 |
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| 136 | # LLVM assembly
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| 137 | # Generate .ll files from .c
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| 138 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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| 139 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -fno-discard-value-names -o $@ $<
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| 140 |
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| 141 | $(obj)/%.ll: $(src)/%.c FORCE
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| 142 | $(call if_changed_dep,cc_ll_c)
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| 143 |
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| 144 | # C (.c) files
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| 145 | # The C file is compiled and updated dependency information is generated.
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| 146 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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| 147 |
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| 148 | is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y)
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| 149 |
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| 150 | # When a module consists of a single object, there is no reason to keep LLVM IR.
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| 151 | # Make $(LD) covert LLVM IR to ELF here.
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| 152 | ifdef CONFIG_LTO_CLANG
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| 153 | cmd_ld_single_m = $(if $(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
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| 154 | endif
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| 155 |
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| 156 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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| 157 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
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| 158 | $(cmd_ld_single_m) \
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| 159 | $(cmd_objtool)
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| 160 |
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| 161 | ifdef CONFIG_MODVERSIONS
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| 162 | # When module versioning is enabled the following steps are executed:
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| 163 | # o compile a <file>.o from <file>.c
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| 164 | # o if <file>.o doesn't contain a __ksymtab version, i.e. does
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| 165 | # not export symbols, it's done.
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| 166 | # o otherwise, we calculate symbol versions using the good old
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| 167 | # genksyms on the preprocessed source and dump them into the .cmd file.
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| 168 | # o modpost will extract versions from that file and create *.c files that will
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| 169 | # be compiled and linked to the kernel and/or modules.
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| 170 |
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| 171 | gen_symversions = \
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| 172 | if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
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| 173 | $(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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| 174 | >> $(dot-target).cmd; \
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| 175 | fi
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| 176 |
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| 177 | cmd_gen_symversions_c = $(call gen_symversions,c)
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| 178 |
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| 179 | endif
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| 180 |
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| 181 | ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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| 182 | # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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| 183 | ifdef BUILD_C_RECORDMCOUNT
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| 184 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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| 185 | RECORDMCOUNT_FLAGS = -w
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| 186 | endif
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| 187 | # Due to recursion, we must skip empty.o.
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| 188 | # The empty.o file is created in the make process in order to determine
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| 189 | # the target endianness and word size. It is made before all other C
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| 190 | # files, including recordmcount.
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| 191 | sub_cmd_record_mcount = \
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| 192 | if [ $(@) != "scripts/mod/empty.o" ]; then \
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| 193 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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| 194 | fi;
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| 195 | recordmcount_source := $(srctree)/scripts/recordmcount.c \
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| 196 | $(srctree)/scripts/recordmcount.h
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| 197 | else
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| 198 | sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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| 199 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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| 200 | "$(if $(CONFIG_64BIT),64,32)" \
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| 201 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
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| 202 | "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
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| 203 | "$(if $(part-of-module),1,0)" "$(@)";
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| 204 | recordmcount_source := $(srctree)/scripts/recordmcount.pl
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| 205 | endif # BUILD_C_RECORDMCOUNT
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| 206 | cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
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| 207 | $(sub_cmd_record_mcount))
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| 208 | endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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| 209 |
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| 210 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
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| 211 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
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| 212 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
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| 213 |
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| 214 | is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y)
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| 215 |
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| 216 | $(obj)/%.o: objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))
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| 217 |
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| 218 | ifdef CONFIG_TRIM_UNUSED_KSYMS
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| 219 | cmd_gen_ksymdeps = \
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| 220 | $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
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| 221 | endif
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| 222 |
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| 223 | cmd_check_local_export = $(srctree)/scripts/check-local-export $@
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| 224 |
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| 225 | ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
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| 226 | cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
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| 227 | endif
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| 228 |
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| 229 | define rule_cc_o_c
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| 230 | $(call cmd_and_fixdep,cc_o_c)
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| 231 | $(call cmd,gen_ksymdeps)
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| 232 | $(call cmd,check_local_export)
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| 233 | $(call cmd,checksrc)
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| 234 | $(call cmd,checkdoc)
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| 235 | $(call cmd,gen_objtooldep)
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| 236 | $(call cmd,gen_symversions_c)
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| 237 | $(call cmd,record_mcount)
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| 238 | $(call cmd,warn_shared_object)
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| 239 | endef
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| 240 |
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| 241 | define rule_as_o_S
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| 242 | $(call cmd_and_fixdep,as_o_S)
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| 243 | $(call cmd,gen_ksymdeps)
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| 244 | $(call cmd,check_local_export)
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| 245 | $(call cmd,gen_objtooldep)
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| 246 | $(call cmd,gen_symversions_S)
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| 247 | $(call cmd,warn_shared_object)
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| 248 | endef
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| 249 |
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| 250 | # Built-in and composite module parts
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| 251 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
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| 252 | $(call if_changed_rule,cc_o_c)
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| 253 | $(call cmd,force_checksrc)
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| 254 |
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| 255 | # To make this rule robust against "Argument list too long" error,
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| 256 | # ensure to add $(obj)/ prefix by a shell command.
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| 257 | cmd_mod = printf '%s\n' $(call real-search, $*.o, .o, -objs -y -m) | \
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| 258 | $(AWK) '!x[$$0]++ { print("$(obj)/"$$0) }' > $@
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| 259 |
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| 260 | $(obj)/%.mod: FORCE
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| 261 | $(call if_changed,mod)
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| 262 |
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| 263 | # List module undefined symbols
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| 264 | cmd_undefined_syms = $(NM) $< | sed -n 's/^ *U //p' > $@
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| 265 |
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| 266 | $(obj)/%.usyms: $(obj)/%.o FORCE
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| 267 | $(call if_changed,undefined_syms)
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| 268 |
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| 269 | quiet_cmd_cc_lst_c = MKLST $@
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| 270 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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| 271 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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| 272 | System.map $(OBJDUMP) > $@
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| 273 |
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| 274 | $(obj)/%.lst: $(src)/%.c FORCE
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| 275 | $(call if_changed_dep,cc_lst_c)
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| 276 |
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| 277 | # Compile Rust sources (.rs)
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| 278 | # ---------------------------------------------------------------------------
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| 279 |
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| 280 | rust_allowed_features := core_ffi_c
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| 281 |
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| 282 | rust_common_cmd = \
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| 283 | RUST_MODFILE=$(modfile) $(RUSTC_OR_CLIPPY) $(rust_flags) \
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| 284 | -Zallow-features=$(rust_allowed_features) \
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| 285 | -Zcrate-attr=no_std \
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| 286 | -Zcrate-attr='feature($(rust_allowed_features))' \
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| 287 | --extern alloc --extern kernel \
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| 288 | --crate-type rlib -L $(objtree)/rust/ \
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| 289 | --crate-name $(basename $(notdir $@)) \
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| 290 | --emit=dep-info=$(depfile)
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| 291 |
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| 292 | # `--emit=obj`, `--emit=asm` and `--emit=llvm-ir` imply a single codegen unit
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| 293 | # will be used. We explicitly request `-Ccodegen-units=1` in any case, and
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| 294 | # the compiler shows a warning if it is not 1. However, if we ever stop
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| 295 | # requesting it explicitly and we start using some other `--emit` that does not
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| 296 | # imply it (and for which codegen is performed), then we would be out of sync,
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| 297 | # i.e. the outputs we would get for the different single targets (e.g. `.ll`)
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| 298 | # would not match each other.
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| 299 |
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| 300 | quiet_cmd_rustc_o_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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| 301 | cmd_rustc_o_rs = $(rust_common_cmd) --emit=obj=$@ $<
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| 302 |
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| 303 | $(obj)/%.o: $(src)/%.rs FORCE
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| 304 | $(call if_changed_dep,rustc_o_rs)
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| 305 |
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| 306 | quiet_cmd_rustc_rsi_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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| 307 | cmd_rustc_rsi_rs = \
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| 308 | $(rust_common_cmd) -Zunpretty=expanded $< >$@; \
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| 309 | command -v $(RUSTFMT) >/dev/null && $(RUSTFMT) $@
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| 310 |
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| 311 | $(obj)/%.rsi: $(src)/%.rs FORCE
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| 312 | $(call if_changed_dep,rustc_rsi_rs)
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| 313 |
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| 314 | quiet_cmd_rustc_s_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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| 315 | cmd_rustc_s_rs = $(rust_common_cmd) --emit=asm=$@ $<
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| 316 |
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| 317 | $(obj)/%.s: $(src)/%.rs FORCE
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| 318 | $(call if_changed_dep,rustc_s_rs)
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| 319 |
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| 320 | quiet_cmd_rustc_ll_rs = $(RUSTC_OR_CLIPPY_QUIET) $(quiet_modtag) $@
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| 321 | cmd_rustc_ll_rs = $(rust_common_cmd) --emit=llvm-ir=$@ $<
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| 322 |
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| 323 | $(obj)/%.ll: $(src)/%.rs FORCE
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| 324 | $(call if_changed_dep,rustc_ll_rs)
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| 325 |
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| 326 | # Compile assembler sources (.S)
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| 327 | # ---------------------------------------------------------------------------
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| 328 |
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| 329 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
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| 330 | # or a file that it includes, in order to get versioned symbols. We build a
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| 331 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
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| 332 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
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| 333 | #
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| 334 | # This is convoluted. The .S file must first be preprocessed to run guards and
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| 335 | # expand names, then the resulting exports must be constructed into plain
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| 336 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
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| 337 | # to make the genksyms input.
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| 338 | #
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| 339 | # These mirror gensymtypes_c and co above, keep them in synch.
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| 340 | cmd_gensymtypes_S = \
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| 341 | { echo "\#include <linux/kernel.h>" ; \
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| 342 | echo "\#include <asm/asm-prototypes.h>" ; \
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| 343 | $(CPP) $(a_flags) $< | \
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| 344 | grep "\<___EXPORT_SYMBOL\>" | \
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| 345 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
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| 346 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
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| 347 |
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| 348 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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| 349 | cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null
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| 350 |
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| 351 | $(obj)/%.symtypes : $(src)/%.S FORCE
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| 352 | $(call cmd,cc_symtypes_S)
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| 353 |
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| 354 |
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| 355 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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| 356 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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| 357 |
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| 358 | $(obj)/%.s: $(src)/%.S FORCE
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| 359 | $(call if_changed_dep,cpp_s_S)
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| 360 |
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| 361 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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| 362 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
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| 363 |
|
| 364 | ifdef CONFIG_ASM_MODVERSIONS
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| 365 |
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| 366 | # versioning matches the C process described above, with difference that
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| 367 | # we parse asm-prototypes.h C header to get function definitions.
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| 368 |
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| 369 | cmd_gen_symversions_S = $(call gen_symversions,S)
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| 370 |
|
| 371 | endif
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| 372 |
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| 373 | $(obj)/%.o: $(src)/%.S FORCE
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| 374 | $(call if_changed_rule,as_o_S)
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| 375 |
|
| 376 | targets += $(filter-out $(subdir-builtin), $(real-obj-y))
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| 377 | targets += $(filter-out $(subdir-modorder), $(real-obj-m))
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| 378 | targets += $(real-dtb-y) $(lib-y) $(always-y)
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| 379 |
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| 380 | # Linker scripts preprocessor (.lds.S -> .lds)
|
| 381 | # ---------------------------------------------------------------------------
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| 382 | quiet_cmd_cpp_lds_S = LDS $@
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| 383 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
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| 384 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
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| 385 |
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| 386 | $(obj)/%.lds: $(src)/%.lds.S FORCE
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| 387 | $(call if_changed_dep,cpp_lds_S)
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| 388 |
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| 389 | # ASN.1 grammar
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| 390 | # ---------------------------------------------------------------------------
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| 391 | quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
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| 392 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
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| 393 | $(basename $@).c $(basename $@).h
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| 394 |
|
| 395 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
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| 396 | $(call cmd,asn1_compiler)
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| 397 |
|
| 398 | # Build the compiled-in targets
|
| 399 | # ---------------------------------------------------------------------------
|
| 400 |
|
| 401 | # To build objects in subdirs, we need to descend into the directories
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| 402 | $(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
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| 403 | $(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
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| 404 |
|
| 405 | #
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| 406 | # Rule to compile a set of .o files into one .a file (without symbol table)
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| 407 | #
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| 408 | # To make this rule robust against "Argument list too long" error,
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| 409 | # remove $(obj)/ prefix, and restore it by a shell command.
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| 410 |
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| 411 | quiet_cmd_ar_builtin = AR $@
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| 412 | cmd_ar_builtin = rm -f $@; \
|
| 413 | $(if $(real-prereqs), printf "$(obj)/%s " $(patsubst $(obj)/%,%,$(real-prereqs)) | xargs) \
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| 414 | $(AR) cDPrST $@
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| 415 |
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| 416 | $(obj)/built-in.a: $(real-obj-y) FORCE
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| 417 | $(call if_changed,ar_builtin)
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| 418 |
|
| 419 | #
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| 420 | # Rule to create modules.order file
|
| 421 | #
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| 422 | # Create commands to either record .ko file or cat modules.order from
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| 423 | # a subdirectory
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| 424 | # Add $(obj-m) as the prerequisite to avoid updating the timestamp of
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| 425 | # modules.order unless contained modules are updated.
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| 426 |
|
| 427 | cmd_modules_order = { $(foreach m, $(real-prereqs), \
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| 428 | $(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \
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| 429 | > $@
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| 430 |
|
| 431 | $(obj)/modules.order: $(obj-m) FORCE
|
| 432 | $(call if_changed,modules_order)
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| 433 |
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| 434 | #
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| 435 | # Rule to compile a set of .o files into one .a file (with symbol table)
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| 436 | #
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| 437 |
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| 438 | $(obj)/lib.a: $(lib-y) FORCE
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| 439 | $(call if_changed,ar)
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| 440 |
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| 441 | quiet_cmd_ld_multi_m = LD [M] $@
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| 442 | cmd_ld_multi_m = $(LD) $(ld_flags) -r -o $@ @$(patsubst %.o,%.mod,$@) $(cmd_objtool)
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| 443 |
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| 444 | define rule_ld_multi_m
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| 445 | $(call cmd_and_savecmd,ld_multi_m)
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| 446 | $(call cmd,gen_objtooldep)
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| 447 | endef
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| 448 |
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| 449 | $(multi-obj-m): objtool-enabled := $(delay-objtool)
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| 450 | $(multi-obj-m): part-of-module := y
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| 451 | $(multi-obj-m): %.o: %.mod FORCE
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| 452 | $(call if_changed_rule,ld_multi_m)
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| 453 | $(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
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| 454 |
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| 455 | # Add intermediate targets:
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| 456 | # When building objects with specific suffix patterns, add intermediate
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| 457 | # targets that the final targets are derived from.
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| 458 | intermediate_targets = $(foreach sfx, $(2), \
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| 459 | $(patsubst %$(strip $(1)),%$(sfx), \
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| 460 | $(filter %$(strip $(1)), $(targets))))
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| 461 | # %.asn1.o <- %.asn1.[ch] <- %.asn1
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| 462 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
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| 463 | # %.dtbo.o <- %.dtbo.S <- %.dtbo <- %.dtso
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| 464 | # %.lex.o <- %.lex.c <- %.l
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| 465 | # %.tab.o <- %.tab.[ch] <- %.y
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| 466 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
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| 467 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
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| 468 | $(call intermediate_targets, .dtbo.o, .dtbo.S .dtbo) \
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| 469 | $(call intermediate_targets, .lex.o, .lex.c) \
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| 470 | $(call intermediate_targets, .tab.o, .tab.c .tab.h)
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| 471 |
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| 472 | # Build
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| 473 | # ---------------------------------------------------------------------------
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| 474 |
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| 475 | $(obj)/: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
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| 476 | $(if $(KBUILD_MODULES), $(targets-for-modules)) \
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| 477 | $(subdir-ym) $(always-y)
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| 478 | @:
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| 479 |
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| 480 | # Single targets
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| 481 | # ---------------------------------------------------------------------------
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| 482 |
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| 483 | single-subdirs := $(foreach d, $(subdir-ym), $(if $(filter $d/%, $(MAKECMDGOALS)), $d))
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| 484 | single-subdir-goals := $(filter $(addsuffix /%, $(single-subdirs)), $(MAKECMDGOALS))
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| 485 |
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| 486 | $(single-subdir-goals): $(single-subdirs)
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| 487 | @:
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| 488 |
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| 489 | # Descending
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| 490 | # ---------------------------------------------------------------------------
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| 491 |
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| 492 | PHONY += $(subdir-ym)
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| 493 | $(subdir-ym):
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| 494 | $(Q)$(MAKE) $(build)=$@ \
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| 495 | need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
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| 496 | need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1) \
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| 497 | $(filter $@/%, $(single-subdir-goals))
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| 498 |
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| 499 | # Add FORCE to the prequisites of a target to force it to be always rebuilt.
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| 500 | # ---------------------------------------------------------------------------
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| 501 |
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| 502 | PHONY += FORCE
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| 503 |
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| 504 | FORCE:
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| 505 |
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| 506 | targets += $(filter-out $(single-subdir-goals), $(MAKECMDGOALS))
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| 507 | targets := $(filter-out $(PHONY), $(targets))
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| 508 |
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| 509 | # Read all saved command lines and dependencies for the $(targets) we
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| 510 | # may be building above, using $(if_changed{,_dep}). As an
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| 511 | # optimization, we don't need to read them if the target does not
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| 512 | # exist, we will rebuild anyway in that case.
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| 513 |
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| 514 | existing-targets := $(wildcard $(sort $(targets)))
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| 515 |
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| 516 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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| 517 |
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| 518 | # Create directories for object files if they do not exist
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| 519 | obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
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| 520 | # If targets exist, their directories apparently exist. Skip mkdir.
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| 521 | existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
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| 522 | obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
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| 523 | ifneq ($(obj-dirs),)
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| 524 | $(shell mkdir -p $(obj-dirs))
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| 525 | endif
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| 526 |
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| 527 | .PHONY: $(PHONY)
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