| 1 | # ==========================================================================
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| 2 | # Building
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| 3 | # ==========================================================================
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| 4 |
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| 5 | src := $(obj)
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| 6 |
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| 7 | .PHONY: __build
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| 8 | __build:
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| 9 |
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| 10 | # Read .config if it exist, otherwise ignore
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| 11 | -include .config
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| 12 |
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| 13 | include $(if $(wildcard $(obj)/Kbuild), $(obj)/Kbuild, $(obj)/Makefile)
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| 14 |
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| 15 | include scripts/Makefile.lib
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| 16 |
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| 17 | ifdef host-progs
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| 18 | ifneq ($(hostprogs-y),$(host-progs))
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| 19 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
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| 20 | hostprogs-y += $(host-progs)
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| 21 | endif
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| 22 | endif
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| 23 |
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| 24 | # Do not include host rules unles needed
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| 25 | ifneq ($(hostprogs-y)$(hostprogs-m),)
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| 26 | include scripts/Makefile.host
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| 27 | endif
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| 28 |
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| 29 | ifneq ($(KBUILD_SRC),)
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| 30 | # Create output directory if not already present
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| 31 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
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| 32 |
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| 33 | # Create directories for object files if directory does not exist
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| 34 | # Needed when obj-y := dir/file.o syntax is used
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| 35 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
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| 36 | endif
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| 37 |
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| 38 |
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| 39 | ifdef EXTRA_TARGETS
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| 40 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
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| 41 | endif
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| 42 |
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| 43 | ifdef build-targets
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| 44 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
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| 45 | endif
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| 46 |
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| 47 | ifdef export-objs
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| 48 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
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| 49 | endif
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| 50 |
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| 51 | ifdef O_TARGET
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| 52 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
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| 53 | endif
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| 54 |
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| 55 | ifdef L_TARGET
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| 56 | $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
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| 57 | endif
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| 58 |
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| 59 | ifdef list-multi
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| 60 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
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| 61 | endif
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| 62 |
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| 63 | ifndef obj
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| 64 | $(warning kbuild: Makefile.build is included improperly)
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| 65 | endif
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| 66 |
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| 67 | # ===========================================================================
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| 68 |
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| 69 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
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| 70 | lib-target := $(obj)/lib.a
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| 71 | endif
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| 72 |
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| 73 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
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| 74 | builtin-target := $(obj)/built-in.o
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| 75 | endif
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| 76 |
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| 77 | # We keep a list of all modules in $(MODVERDIR)
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| 78 |
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| 79 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
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| 80 | $(if $(KBUILD_MODULES),$(obj-m)) \
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| 81 | $(subdir-ym) $(always)
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| 82 | @:
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| 83 |
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| 84 | # Linus' kernel sanity checking tool
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| 85 | ifneq ($(KBUILD_CHECKSRC),0)
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| 86 | ifeq ($(KBUILD_CHECKSRC),2)
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| 87 | quiet_cmd_force_checksrc = CHECK $<
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| 88 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
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| 89 | else
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| 90 | quiet_cmd_checksrc = CHECK $<
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| 91 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
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| 92 | endif
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| 93 | endif
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| 94 |
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| 95 |
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| 96 | # Compile C sources (.c)
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| 97 | # ---------------------------------------------------------------------------
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| 98 |
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| 99 | # Default is built-in, unless we know otherwise
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| 100 | modkern_cflags := $(CFLAGS_KERNEL)
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| 101 | quiet_modtag := $(empty) $(empty)
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| 102 |
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| 103 | $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
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| 104 | $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
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| 105 | $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
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| 106 | $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
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| 107 |
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| 108 | $(real-objs-m) : quiet_modtag := [M]
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| 109 | $(real-objs-m:.o=.i) : quiet_modtag := [M]
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| 110 | $(real-objs-m:.o=.s) : quiet_modtag := [M]
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| 111 | $(real-objs-m:.o=.lst): quiet_modtag := [M]
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| 112 |
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| 113 | $(obj-m) : quiet_modtag := [M]
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| 114 |
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| 115 | # Default for not multi-part modules
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| 116 | modname = $(*F)
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| 117 |
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| 118 | $(multi-objs-m) : modname = $(modname-multi)
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| 119 | $(multi-objs-m:.o=.i) : modname = $(modname-multi)
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| 120 | $(multi-objs-m:.o=.s) : modname = $(modname-multi)
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| 121 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
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| 122 | $(multi-objs-y) : modname = $(modname-multi)
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| 123 | $(multi-objs-y:.o=.i) : modname = $(modname-multi)
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| 124 | $(multi-objs-y:.o=.s) : modname = $(modname-multi)
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| 125 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
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| 126 |
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| 127 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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| 128 | cmd_cc_s_c = $(CC) $(c_flags) -S -o $@ $<
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| 129 |
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| 130 | %.s: %.c FORCE
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| 131 | $(call if_changed_dep,cc_s_c)
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| 132 |
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| 133 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
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| 134 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
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| 135 |
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| 136 | %.i: %.c FORCE
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| 137 | $(call if_changed_dep,cc_i_c)
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| 138 |
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| 139 | # C (.c) files
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| 140 | # The C file is compiled and updated dependency information is generated.
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| 141 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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| 142 |
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| 143 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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| 144 |
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| 145 | ifndef CONFIG_MODVERSIONS
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| 146 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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| 147 |
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| 148 | else
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| 149 | # When module versioning is enabled the following steps are executed:
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| 150 | # o compile a .tmp_<file>.o from <file>.c
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| 151 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
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| 152 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and
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| 153 | # are done.
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| 154 | # o otherwise, we calculate symbol versions using the good old
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| 155 | # genksyms on the preprocessed source and postprocess them in a way
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| 156 | # that they are usable as a linker script
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| 157 | # o generate <file>.o from .tmp_<file>.o using the linker to
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| 158 | # replace the unresolved symbols __crc_exported_symbol with
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| 159 | # the actual value of the checksum generated by genksyms
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| 160 |
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| 161 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
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| 162 | cmd_modversions = \
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| 163 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
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| 164 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \
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| 165 | | $(GENKSYMS) \
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| 166 | > $(@D)/.tmp_$(@F:.o=.ver); \
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| 167 | \
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| 168 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
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| 169 | -T $(@D)/.tmp_$(@F:.o=.ver); \
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| 170 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
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| 171 | else \
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| 172 | mv $(@D)/.tmp_$(@F) $@; \
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| 173 | fi;
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| 174 | endif
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| 175 |
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| 176 | define rule_cc_o_c
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| 177 | $(if $($(quiet)cmd_checksrc),echo ' $($(quiet)cmd_checksrc)';) \
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| 178 | $(cmd_checksrc) \
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| 179 | $(if $($(quiet)cmd_cc_o_c),echo ' $(subst ','\'',$($(quiet)cmd_cc_o_c))';) \
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| 180 | $(cmd_cc_o_c); \
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| 181 | $(cmd_modversions) \
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| 182 | scripts/basic/fixdep $(depfile) $@ '$(subst ','\'',$(cmd_cc_o_c))' > $(@D)/.$(@F).tmp; \
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| 183 | rm -f $(depfile); \
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| 184 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
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| 185 | endef
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| 186 |
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| 187 | # Built-in and composite module parts
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| 188 |
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| 189 | %.o: %.c FORCE
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| 190 | $(call cmd,force_checksrc)
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| 191 | $(call if_changed_rule,cc_o_c)
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| 192 |
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| 193 | # Single-part modules are special since we need to mark them in $(MODVERDIR)
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| 194 |
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| 195 | $(single-used-m): %.o: %.c FORCE
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| 196 | $(call cmd,force_checksrc)
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| 197 | $(call if_changed_rule,cc_o_c)
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| 198 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
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| 199 |
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| 200 | quiet_cmd_cc_lst_c = MKLST $@
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| 201 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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| 202 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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| 203 | System.map $(OBJDUMP) > $@
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| 204 |
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| 205 | %.lst: %.c FORCE
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| 206 | $(call if_changed_dep,cc_lst_c)
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| 207 |
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| 208 | # Compile assembler sources (.S)
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| 209 | # ---------------------------------------------------------------------------
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| 210 |
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| 211 | modkern_aflags := $(AFLAGS_KERNEL)
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| 212 |
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| 213 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
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| 214 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
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| 215 |
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| 216 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
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| 217 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
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| 218 |
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| 219 | %.s: %.S FORCE
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| 220 | $(call if_changed_dep,as_s_S)
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| 221 |
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| 222 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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| 223 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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| 224 |
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| 225 | %.o: %.S FORCE
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| 226 | $(call if_changed_dep,as_o_S)
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| 227 |
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| 228 | targets += $(real-objs-y) $(real-objs-m) $(lib-y)
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| 229 | targets += $(extra-y) $(MAKECMDGOALS) $(always)
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| 230 |
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| 231 | # Linker scripts preprocessor (.lds.S -> .lds)
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| 232 | # ---------------------------------------------------------------------------
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| 233 | quiet_cmd_cpp_lds_S = LDS $@
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| 234 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
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| 235 |
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| 236 | %.lds: %.lds.S FORCE
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| 237 | $(call if_changed_dep,cpp_lds_S)
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| 238 |
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| 239 | # Build the compiled-in targets
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| 240 | # ---------------------------------------------------------------------------
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| 241 |
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| 242 | # To build objects in subdirs, we need to descend into the directories
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| 243 | $(sort $(subdir-obj-y)): $(subdir-ym) ;
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| 244 |
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| 245 | #
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| 246 | # Rule to compile a set of .o files into one .o file
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| 247 | #
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| 248 | ifdef builtin-target
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| 249 | quiet_cmd_link_o_target = LD $@
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| 250 | # If the list of objects to link is empty, just create an empty built-in.o
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| 251 | cmd_link_o_target = $(if $(strip $(obj-y)),\
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| 252 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
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| 253 | rm -f $@; $(AR) rcs $@)
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| 254 |
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| 255 | $(builtin-target): $(obj-y) FORCE
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| 256 | $(call if_changed,link_o_target)
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| 257 |
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| 258 | targets += $(builtin-target)
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| 259 | endif # builtin-target
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| 260 |
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| 261 | #
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| 262 | # Rule to compile a set of .o files into one .a file
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| 263 | #
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| 264 | ifdef lib-target
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| 265 | quiet_cmd_link_l_target = AR $@
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| 266 | cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
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| 267 |
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| 268 | $(lib-target): $(lib-y) FORCE
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| 269 | $(call if_changed,link_l_target)
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| 270 |
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| 271 | targets += $(lib-target)
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| 272 | endif
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| 273 |
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| 274 | #
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| 275 | # Rule to link composite objects
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| 276 | #
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| 277 | # Composite objects are specified in kbuild makefile as follows:
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| 278 | # <composite-object>-objs := <list of .o files>
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| 279 | # or
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| 280 | # <composite-object>-y := <list of .o files>
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| 281 | link_multi_deps = \
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| 282 | $(filter $(addprefix $(obj)/, \
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| 283 | $($(subst $(obj)/,,$(@:.o=-objs))) \
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| 284 | $($(subst $(obj)/,,$(@:.o=-y)))), $^)
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| 285 |
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| 286 | quiet_cmd_link_multi-y = LD $@
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| 287 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
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| 288 |
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| 289 | quiet_cmd_link_multi-m = LD [M] $@
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| 290 | cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
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| 291 |
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| 292 | # We would rather have a list of rules like
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| 293 | # foo.o: $(foo-objs)
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| 294 | # but that's not so easy, so we rather make all composite objects depend
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| 295 | # on the set of all their parts
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| 296 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE
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| 297 | $(call if_changed,link_multi-y)
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| 298 |
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| 299 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE
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| 300 | $(call if_changed,link_multi-m)
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| 301 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
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| 302 |
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| 303 | targets += $(multi-used-y) $(multi-used-m)
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| 304 |
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| 305 |
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| 306 | # Descending
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| 307 | # ---------------------------------------------------------------------------
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| 308 |
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| 309 | .PHONY: $(subdir-ym)
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| 310 | $(subdir-ym):
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| 311 | $(Q)$(MAKE) $(build)=$@
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| 312 |
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| 313 | # Add FORCE to the prequisites of a target to force it to be always rebuilt.
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| 314 | # ---------------------------------------------------------------------------
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| 315 |
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| 316 | .PHONY: FORCE
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| 317 |
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| 318 | FORCE:
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| 319 |
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| 320 | # Read all saved command lines and dependencies for the $(targets) we
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| 321 | # may be building above, using $(if_changed{,_dep}). As an
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| 322 | # optimization, we don't need to read them if the target does not
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| 323 | # exist, we will rebuild anyway in that case.
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| 324 |
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| 325 | targets := $(wildcard $(sort $(targets)))
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| 326 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
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| 327 |
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| 328 | ifneq ($(cmd_files),)
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| 329 | include $(cmd_files)
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| 330 | endif
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