| 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 := __build
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| 9 | __build:
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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 :=
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| 19 | always-y :=
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| 20 | always-m :=
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| 21 | targets :=
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| 22 | subdir-y :=
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| 23 | subdir-m :=
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| 24 | EXTRA_AFLAGS :=
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| 25 | EXTRA_CFLAGS :=
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| 26 | EXTRA_CPPFLAGS :=
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| 27 | EXTRA_LDFLAGS :=
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| 28 | asflags-y :=
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| 29 | ccflags-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 scripts/Kbuild.include
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| 40 |
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| 41 | # The filename Kbuild has precedence over Makefile
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| 42 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
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| 43 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
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| 44 | include $(kbuild-file)
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| 45 |
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| 46 | include scripts/Makefile.lib
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| 47 |
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| 48 | # Do not include host rules unless needed
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| 49 | ifneq ($(hostprogs)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
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| 50 | include scripts/Makefile.host
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| 51 | endif
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| 52 |
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| 53 | ifndef obj
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| 54 | $(warning kbuild: Makefile.build is included improperly)
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| 55 | endif
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| 56 |
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| 57 | ifeq ($(need-modorder),)
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| 58 | ifneq ($(obj-m),)
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| 59 | $(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
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| 60 | $(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
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| 61 | endif
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| 62 | endif
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| 63 |
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| 64 | # ===========================================================================
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| 65 |
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| 66 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
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| 67 | lib-target := $(obj)/lib.a
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| 68 | real-obj-y += $(obj)/lib-ksyms.o
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| 69 | endif
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| 70 |
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| 71 | ifdef need-builtin
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| 72 | builtin-target := $(obj)/built-in.a
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| 73 | endif
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| 74 |
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| 75 | ifeq ($(CONFIG_MODULES)$(need-modorder),y1)
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| 76 | modorder-target := $(obj)/modules.order
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| 77 | endif
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| 78 |
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| 79 | mod-targets := $(patsubst %.o, %.mod, $(obj-m))
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| 80 |
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| 81 | # Linus' kernel sanity checking tool
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| 82 | ifeq ($(KBUILD_CHECKSRC),1)
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| 83 | quiet_cmd_checksrc = CHECK $<
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| 84 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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| 85 | else ifeq ($(KBUILD_CHECKSRC),2)
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| 86 | quiet_cmd_force_checksrc = CHECK $<
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| 87 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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| 88 | endif
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| 89 |
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| 90 | ifneq ($(KBUILD_EXTRA_WARN),)
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| 91 | cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
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| 92 | endif
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| 93 |
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| 94 | # Compile C sources (.c)
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| 95 | # ---------------------------------------------------------------------------
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| 96 |
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| 97 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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| 98 | cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS), $(c_flags)) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
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| 99 |
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| 100 | $(obj)/%.s: $(src)/%.c FORCE
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| 101 | $(call if_changed_dep,cc_s_c)
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| 102 |
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| 103 | quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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| 104 | cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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| 105 |
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| 106 | $(obj)/%.i: $(src)/%.c FORCE
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| 107 | $(call if_changed_dep,cpp_i_c)
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| 108 |
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| 109 | # These mirror gensymtypes_S and co below, keep them in synch.
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| 110 | cmd_gensymtypes_c = \
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| 111 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
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| 112 | scripts/genksyms/genksyms $(if $(1), -T $(2)) \
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| 113 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
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| 114 | $(if $(KBUILD_PRESERVE),-p) \
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| 115 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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| 116 |
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| 117 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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| 118 | cmd_cc_symtypes_c = \
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| 119 | $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
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| 120 | test -s $@ || rm -f $@
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| 121 |
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| 122 | $(obj)/%.symtypes : $(src)/%.c FORCE
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| 123 | $(call cmd,cc_symtypes_c)
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| 124 |
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| 125 | # LLVM assembly
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| 126 | # Generate .ll files from .c
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| 127 | quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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| 128 | cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
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| 129 |
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| 130 | $(obj)/%.ll: $(src)/%.c FORCE
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| 131 | $(call if_changed_dep,cc_ll_c)
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| 132 |
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| 133 | # C (.c) files
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| 134 | # The C file is compiled and updated dependency information is generated.
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| 135 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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| 136 |
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| 137 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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| 138 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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| 139 |
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| 140 | ifdef CONFIG_MODVERSIONS
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| 141 | # When module versioning is enabled the following steps are executed:
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| 142 | # o compile a <file>.o from <file>.c
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| 143 | # o if <file>.o doesn't contain a __ksymtab version, i.e. does
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| 144 | # not export symbols, it's done.
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| 145 | # o otherwise, we calculate symbol versions using the good old
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| 146 | # genksyms on the preprocessed source and postprocess them in a way
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| 147 | # that they are usable as a linker script
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| 148 | # o generate .tmp_<file>.o from <file>.o using the linker to
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| 149 | # replace the unresolved symbols __crc_exported_symbol with
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| 150 | # the actual value of the checksum generated by genksyms
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| 151 | # o remove .tmp_<file>.o to <file>.o
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| 152 |
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| 153 | cmd_modversions_c = \
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| 154 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
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| 155 | $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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| 156 | > $(@D)/.tmp_$(@F:.o=.ver); \
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| 157 | \
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| 158 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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| 159 | -T $(@D)/.tmp_$(@F:.o=.ver); \
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| 160 | mv -f $(@D)/.tmp_$(@F) $@; \
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| 161 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \
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| 162 | fi
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| 163 | endif
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| 164 |
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| 165 | ifdef CONFIG_FTRACE_MCOUNT_RECORD
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| 166 | ifndef CC_USING_RECORD_MCOUNT
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| 167 | # compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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| 168 | ifdef BUILD_C_RECORDMCOUNT
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| 169 | ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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| 170 | RECORDMCOUNT_FLAGS = -w
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| 171 | endif
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| 172 | # Due to recursion, we must skip empty.o.
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| 173 | # The empty.o file is created in the make process in order to determine
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| 174 | # the target endianness and word size. It is made before all other C
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| 175 | # files, including recordmcount.
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| 176 | sub_cmd_record_mcount = \
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| 177 | if [ $(@) != "scripts/mod/empty.o" ]; then \
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| 178 | $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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| 179 | fi;
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| 180 | recordmcount_source := $(srctree)/scripts/recordmcount.c \
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| 181 | $(srctree)/scripts/recordmcount.h
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| 182 | else
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| 183 | sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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| 184 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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| 185 | "$(if $(CONFIG_64BIT),64,32)" \
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| 186 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
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| 187 | "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
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| 188 | "$(if $(part-of-module),1,0)" "$(@)";
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| 189 | recordmcount_source := $(srctree)/scripts/recordmcount.pl
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| 190 | endif # BUILD_C_RECORDMCOUNT
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| 191 | cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
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| 192 | $(sub_cmd_record_mcount))
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| 193 | endif # CC_USING_RECORD_MCOUNT
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| 194 | endif # CONFIG_FTRACE_MCOUNT_RECORD
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| 195 |
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| 196 | ifdef CONFIG_STACK_VALIDATION
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| 197 | ifneq ($(SKIP_STACK_VALIDATION),1)
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| 198 |
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| 199 | __objtool_obj := $(objtree)/tools/objtool/objtool
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| 200 |
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| 201 | objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
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| 202 |
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| 203 | objtool_args += $(if $(part-of-module), --module,)
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| 204 |
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| 205 | ifndef CONFIG_FRAME_POINTER
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| 206 | objtool_args += --no-fp
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| 207 | endif
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| 208 | ifdef CONFIG_GCOV_KERNEL
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| 209 | objtool_args += --no-unreachable
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| 210 | endif
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| 211 | ifdef CONFIG_RETPOLINE
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| 212 | objtool_args += --retpoline
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| 213 | endif
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| 214 | ifdef CONFIG_X86_SMAP
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| 215 | objtool_args += --uaccess
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| 216 | endif
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| 217 |
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| 218 | # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
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| 219 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
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| 220 | # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
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| 221 | cmd_objtool = $(if $(patsubst y%,, \
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| 222 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
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| 223 | $(__objtool_obj) $(objtool_args) $@)
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| 224 | objtool_obj = $(if $(patsubst y%,, \
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| 225 | $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
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| 226 | $(__objtool_obj))
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| 227 |
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| 228 | endif # SKIP_STACK_VALIDATION
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| 229 | endif # CONFIG_STACK_VALIDATION
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| 230 |
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| 231 | # Rebuild all objects when objtool changes, or is enabled/disabled.
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| 232 | objtool_dep = $(objtool_obj) \
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| 233 | $(wildcard include/config/orc/unwinder.h \
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| 234 | include/config/stack/validation.h)
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| 235 |
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| 236 | ifdef CONFIG_TRIM_UNUSED_KSYMS
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| 237 | cmd_gen_ksymdeps = \
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| 238 | $(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
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| 239 | endif
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| 240 |
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| 241 | define rule_cc_o_c
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| 242 | $(call cmd,checksrc)
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| 243 | $(call cmd_and_fixdep,cc_o_c)
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| 244 | $(call cmd,gen_ksymdeps)
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| 245 | $(call cmd,checkdoc)
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| 246 | $(call cmd,objtool)
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| 247 | $(call cmd,modversions_c)
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| 248 | $(call cmd,record_mcount)
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| 249 | endef
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| 250 |
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| 251 | define rule_as_o_S
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| 252 | $(call cmd_and_fixdep,as_o_S)
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| 253 | $(call cmd,gen_ksymdeps)
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| 254 | $(call cmd,objtool)
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| 255 | $(call cmd,modversions_S)
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| 256 | endef
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| 257 |
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| 258 | # List module undefined symbols (or empty line if not enabled)
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| 259 | ifdef CONFIG_TRIM_UNUSED_KSYMS
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| 260 | cmd_undef_syms = $(NM) $< | sed -n 's/^ *U //p' | xargs echo
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| 261 | else
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| 262 | cmd_undef_syms = echo
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| 263 | endif
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| 264 |
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| 265 | # Built-in and composite module parts
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| 266 | $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
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| 267 | $(call cmd,force_checksrc)
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| 268 | $(call if_changed_rule,cc_o_c)
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| 269 |
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| 270 | cmd_mod = { \
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| 271 | echo $(if $($*-objs)$($*-y)$($*-m), $(addprefix $(obj)/, $($*-objs) $($*-y) $($*-m)), $(@:.mod=.o)); \
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| 272 | $(cmd_undef_syms); \
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| 273 | } > $@
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| 274 |
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| 275 | $(obj)/%.mod: $(obj)/%.o FORCE
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| 276 | $(call if_changed,mod)
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| 277 |
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| 278 | targets += $(mod-targets)
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| 279 |
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| 280 | quiet_cmd_cc_lst_c = MKLST $@
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| 281 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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| 282 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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| 283 | System.map $(OBJDUMP) > $@
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| 284 |
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| 285 | $(obj)/%.lst: $(src)/%.c FORCE
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| 286 | $(call if_changed_dep,cc_lst_c)
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| 287 |
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| 288 | # Compile assembler sources (.S)
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| 289 | # ---------------------------------------------------------------------------
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| 290 |
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| 291 | # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
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| 292 | # or a file that it includes, in order to get versioned symbols. We build a
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| 293 | # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
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| 294 | # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
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| 295 | #
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| 296 | # This is convoluted. The .S file must first be preprocessed to run guards and
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| 297 | # expand names, then the resulting exports must be constructed into plain
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| 298 | # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
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| 299 | # to make the genksyms input.
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| 300 | #
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| 301 | # These mirror gensymtypes_c and co above, keep them in synch.
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| 302 | cmd_gensymtypes_S = \
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| 303 | { echo "\#include <linux/kernel.h>" ; \
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| 304 | echo "\#include <asm/asm-prototypes.h>" ; \
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| 305 | $(CPP) $(a_flags) $< | \
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| 306 | grep "\<___EXPORT_SYMBOL\>" | \
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| 307 | sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
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| 308 | $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
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| 309 | scripts/genksyms/genksyms $(if $(1), -T $(2)) \
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| 310 | $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS)) \
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| 311 | $(if $(KBUILD_PRESERVE),-p) \
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| 312 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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| 313 |
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| 314 | quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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| 315 | cmd_cc_symtypes_S = \
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| 316 | $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
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| 317 | test -s $@ || rm -f $@
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| 318 |
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| 319 | $(obj)/%.symtypes : $(src)/%.S FORCE
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| 320 | $(call cmd,cc_symtypes_S)
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| 321 |
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| 322 |
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| 323 | quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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| 324 | cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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| 325 |
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| 326 | $(obj)/%.s: $(src)/%.S FORCE
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| 327 | $(call if_changed_dep,cpp_s_S)
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| 328 |
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| 329 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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| 330 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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| 331 |
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| 332 | ifdef CONFIG_ASM_MODVERSIONS
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| 333 |
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| 334 | # versioning matches the C process described above, with difference that
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| 335 | # we parse asm-prototypes.h C header to get function definitions.
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| 336 |
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| 337 | cmd_modversions_S = \
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| 338 | if $(OBJDUMP) -h $@ | grep -q __ksymtab; then \
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| 339 | $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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| 340 | > $(@D)/.tmp_$(@F:.o=.ver); \
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| 341 | \
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| 342 | $(LD) $(KBUILD_LDFLAGS) -r -o $(@D)/.tmp_$(@F) $@ \
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| 343 | -T $(@D)/.tmp_$(@F:.o=.ver); \
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| 344 | mv -f $(@D)/.tmp_$(@F) $@; \
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| 345 | rm -f $(@D)/.tmp_$(@F:.o=.ver); \
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| 346 | fi
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| 347 | endif
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| 348 |
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| 349 | $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
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| 350 | $(call if_changed_rule,as_o_S)
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| 351 |
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| 352 | targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)
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| 353 | targets += $(extra-y) $(always-y) $(MAKECMDGOALS)
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| 354 |
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| 355 | # Linker scripts preprocessor (.lds.S -> .lds)
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| 356 | # ---------------------------------------------------------------------------
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| 357 | quiet_cmd_cpp_lds_S = LDS $@
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| 358 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
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| 359 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
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| 360 |
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| 361 | $(obj)/%.lds: $(src)/%.lds.S FORCE
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| 362 | $(call if_changed_dep,cpp_lds_S)
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| 363 |
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| 364 | # ASN.1 grammar
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| 365 | # ---------------------------------------------------------------------------
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| 366 | quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
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| 367 | cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
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| 368 | $(basename $@).c $(basename $@).h
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| 369 |
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| 370 | $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
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| 371 | $(call cmd,asn1_compiler)
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| 372 |
|
| 373 | # Build the compiled-in targets
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| 374 | # ---------------------------------------------------------------------------
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| 375 |
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| 376 | # To build objects in subdirs, we need to descend into the directories
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| 377 | $(obj)/%/built-in.a: $(obj)/% ;
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| 378 |
|
| 379 | #
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| 380 | # Rule to compile a set of .o files into one .a file (without symbol table)
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| 381 | #
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| 382 | ifdef builtin-target
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| 383 |
|
| 384 | quiet_cmd_ar_builtin = AR $@
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| 385 | cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
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| 386 |
|
| 387 | $(builtin-target): $(real-obj-y) FORCE
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| 388 | $(call if_changed,ar_builtin)
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| 389 |
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| 390 | targets += $(builtin-target)
|
| 391 | endif # builtin-target
|
| 392 |
|
| 393 | #
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| 394 | # Rule to create modules.order file
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| 395 | #
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| 396 | # Create commands to either record .ko file or cat modules.order from
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| 397 | # a subdirectory
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| 398 | $(modorder-target): $(subdir-ym) FORCE
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| 399 | $(Q){ $(foreach m, $(modorder), \
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| 400 | $(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \
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| 401 | | $(AWK) '!x[$$0]++' - > $@
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| 402 |
|
| 403 | #
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| 404 | # Rule to compile a set of .o files into one .a file (with symbol table)
|
| 405 | #
|
| 406 | ifdef lib-target
|
| 407 |
|
| 408 | $(lib-target): $(lib-y) FORCE
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| 409 | $(call if_changed,ar)
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| 410 |
|
| 411 | targets += $(lib-target)
|
| 412 |
|
| 413 | dummy-object = $(obj)/.lib_exports.o
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| 414 | ksyms-lds = $(dot-target).lds
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| 415 |
|
| 416 | quiet_cmd_export_list = EXPORTS $@
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| 417 | cmd_export_list = $(OBJDUMP) -h $< | \
|
| 418 | sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\
|
| 419 | rm -f $(dummy-object);\
|
| 420 | echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
|
| 421 | $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
|
| 422 | rm $(dummy-object) $(ksyms-lds)
|
| 423 |
|
| 424 | $(obj)/lib-ksyms.o: $(lib-target) FORCE
|
| 425 | $(call if_changed,export_list)
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| 426 |
|
| 427 | targets += $(obj)/lib-ksyms.o
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| 428 |
|
| 429 | endif
|
| 430 |
|
| 431 | # NOTE:
|
| 432 | # Do not replace $(filter %.o,^) with $(real-prereqs). When a single object
|
| 433 | # module is turned into a multi object module, $^ will contain header file
|
| 434 | # dependencies recorded in the .*.cmd file.
|
| 435 | quiet_cmd_link_multi-m = LD [M] $@
|
| 436 | cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ $(filter %.o,$^)
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| 437 |
|
| 438 | $(multi-used-m): FORCE
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| 439 | $(call if_changed,link_multi-m)
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| 440 | $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
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| 441 |
|
| 442 | targets += $(multi-used-m)
|
| 443 | targets := $(filter-out $(PHONY), $(targets))
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| 444 |
|
| 445 | # Add intermediate targets:
|
| 446 | # When building objects with specific suffix patterns, add intermediate
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| 447 | # targets that the final targets are derived from.
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| 448 | intermediate_targets = $(foreach sfx, $(2), \
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| 449 | $(patsubst %$(strip $(1)),%$(sfx), \
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| 450 | $(filter %$(strip $(1)), $(targets))))
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| 451 | # %.asn1.o <- %.asn1.[ch] <- %.asn1
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| 452 | # %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
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| 453 | # %.lex.o <- %.lex.c <- %.l
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| 454 | # %.tab.o <- %.tab.[ch] <- %.y
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| 455 | targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
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| 456 | $(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
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| 457 | $(call intermediate_targets, .lex.o, .lex.c) \
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| 458 | $(call intermediate_targets, .tab.o, .tab.c .tab.h)
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| 459 |
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| 460 | # Build
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| 461 | # ---------------------------------------------------------------------------
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| 462 |
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| 463 | ifdef single-build
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| 464 |
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| 465 | KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS))
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| 466 |
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| 467 | curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
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| 468 | $(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
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| 469 |
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| 470 | # Handle single targets without any rule: show "Nothing to be done for ..." or
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| 471 | # "No rule to make target ..." depending on whether the target exists.
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| 472 | unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
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| 473 | $(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
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| 474 |
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| 475 | single-subdirs := $(foreach d, $(subdir-ym), \
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| 476 | $(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
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| 477 |
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| 478 | __build: $(curdir-single) $(single-subdirs)
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| 479 | ifneq ($(unknown-single),)
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| 480 | $(Q)$(MAKE) -f /dev/null $(unknown-single)
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| 481 | endif
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| 482 | @:
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| 483 |
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| 484 | ifeq ($(curdir-single),)
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| 485 | # Nothing to do in this directory. Do not include any .*.cmd file for speed-up
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| 486 | targets :=
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| 487 | else
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| 488 | targets += $(curdir-single)
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| 489 | endif
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| 490 |
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| 491 | else
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| 492 |
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| 493 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
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| 494 | $(if $(KBUILD_MODULES),$(obj-m) $(mod-targets) $(modorder-target)) \
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| 495 | $(subdir-ym) $(always-y)
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| 496 | @:
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| 497 |
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| 498 | endif
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| 499 |
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| 500 | # Descending
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| 501 | # ---------------------------------------------------------------------------
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| 502 |
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| 503 | PHONY += $(subdir-ym)
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| 504 | $(subdir-ym):
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| 505 | $(Q)$(MAKE) $(build)=$@ \
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| 506 | $(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
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| 507 | need-builtin=$(if $(filter $@/built-in.a, $(subdir-obj-y)),1) \
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| 508 | need-modorder=$(if $(need-modorder),$(if $(filter $@/modules.order, $(modorder)),1))
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| 509 |
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| 510 | # Add FORCE to the prequisites of a target to force it to be always rebuilt.
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| 511 | # ---------------------------------------------------------------------------
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| 512 |
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| 513 | PHONY += FORCE
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| 514 |
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| 515 | FORCE:
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| 516 |
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| 517 | # Read all saved command lines and dependencies for the $(targets) we
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| 518 | # may be building above, using $(if_changed{,_dep}). As an
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| 519 | # optimization, we don't need to read them if the target does not
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| 520 | # exist, we will rebuild anyway in that case.
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| 521 |
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| 522 | existing-targets := $(wildcard $(sort $(targets)))
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| 523 |
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| 524 | -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
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| 525 |
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| 526 | ifdef building_out_of_srctree
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| 527 | # Create directories for object files if they do not exist
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| 528 | obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
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| 529 | # If targets exist, their directories apparently exist. Skip mkdir.
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| 530 | existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
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| 531 | obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
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| 532 | ifneq ($(obj-dirs),)
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| 533 | $(shell mkdir -p $(obj-dirs))
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| 534 | endif
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| 535 | endif
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| 536 |
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| 537 | .PHONY: $(PHONY)
|