| 1 | # ==========================================================================
|
| 2 | # Building
|
| 3 | # ==========================================================================
|
| 4 |
|
| 5 | src := $(obj)
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| 6 |
|
| 7 | PHONY := __build
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| 8 | __build:
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| 9 |
|
| 10 | # Init all relevant variables used in kbuild files so
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| 11 | # 1) they have correct type
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| 12 | # 2) they do not inherit any value from the environment
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| 13 | obj-y :=
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| 14 | obj-m :=
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| 15 | lib-y :=
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| 16 | lib-m :=
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| 17 | always :=
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| 18 | targets :=
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| 19 | subdir-y :=
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| 20 | subdir-m :=
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| 21 | EXTRA_AFLAGS :=
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| 22 | EXTRA_CFLAGS :=
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| 23 | EXTRA_CPPFLAGS :=
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| 24 | EXTRA_LDFLAGS :=
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| 25 | asflags-y :=
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| 26 | ccflags-y :=
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| 27 | cppflags-y :=
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| 28 | ldflags-y :=
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| 29 |
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| 30 | subdir-asflags-y :=
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| 31 | subdir-ccflags-y :=
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| 32 |
|
| 33 | # Read auto.conf if it exists, otherwise ignore
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| 34 | -include include/config/auto.conf
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| 35 |
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| 36 | include scripts/Kbuild.include
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| 37 |
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| 38 | # For backward compatibility check that these variables do not change
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| 39 | save-cflags := $(CFLAGS)
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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 $(kbuild-file)
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| 45 |
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| 46 | # If the save-* variables changed error out
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| 47 | ifeq ($(KBUILD_NOPEDANTIC),)
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| 48 | ifneq ("$(save-cflags)","$(CFLAGS)")
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| 49 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
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| 50 | endif
|
| 51 | endif
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| 52 |
|
| 53 | #
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| 54 | # make W=1 settings
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| 55 | #
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| 56 | # $(call cc-option... ) handles gcc -W.. options which
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| 57 | # are not supported by all versions of the compiler
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| 58 | ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
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| 59 | KBUILD_EXTRA_WARNINGS := -Wextra
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| 60 | KBUILD_EXTRA_WARNINGS += -Wunused -Wno-unused-parameter
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| 61 | KBUILD_EXTRA_WARNINGS += -Waggregate-return
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| 62 | KBUILD_EXTRA_WARNINGS += -Wbad-function-cast
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| 63 | KBUILD_EXTRA_WARNINGS += -Wcast-qual
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| 64 | KBUILD_EXTRA_WARNINGS += -Wcast-align
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| 65 | KBUILD_EXTRA_WARNINGS += -Wconversion
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| 66 | KBUILD_EXTRA_WARNINGS += -Wdisabled-optimization
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| 67 | KBUILD_EXTRA_WARNINGS += -Wlogical-op
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| 68 | KBUILD_EXTRA_WARNINGS += -Wmissing-declarations
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| 69 | KBUILD_EXTRA_WARNINGS += -Wmissing-format-attribute
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| 70 | KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wmissing-include-dirs,)
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| 71 | KBUILD_EXTRA_WARNINGS += -Wmissing-prototypes
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| 72 | KBUILD_EXTRA_WARNINGS += -Wnested-externs
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| 73 | KBUILD_EXTRA_WARNINGS += -Wold-style-definition
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| 74 | KBUILD_EXTRA_WARNINGS += $(call cc-option, -Woverlength-strings,)
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| 75 | KBUILD_EXTRA_WARNINGS += -Wpacked
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| 76 | KBUILD_EXTRA_WARNINGS += -Wpacked-bitfield-compat
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| 77 | KBUILD_EXTRA_WARNINGS += -Wpadded
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| 78 | KBUILD_EXTRA_WARNINGS += -Wpointer-arith
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| 79 | KBUILD_EXTRA_WARNINGS += -Wredundant-decls
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| 80 | KBUILD_EXTRA_WARNINGS += -Wshadow
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| 81 | KBUILD_EXTRA_WARNINGS += -Wswitch-default
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| 82 | KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wvla,)
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| 83 | KBUILD_CFLAGS += $(KBUILD_EXTRA_WARNINGS)
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| 84 | endif
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| 85 |
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| 86 | include scripts/Makefile.lib
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| 87 |
|
| 88 | ifdef host-progs
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| 89 | ifneq ($(hostprogs-y),$(host-progs))
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| 90 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
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| 91 | hostprogs-y += $(host-progs)
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| 92 | endif
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| 93 | endif
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| 94 |
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| 95 | # Do not include host rules unless needed
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| 96 | ifneq ($(hostprogs-y)$(hostprogs-m),)
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| 97 | include scripts/Makefile.host
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| 98 | endif
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| 99 |
|
| 100 | ifneq ($(KBUILD_SRC),)
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| 101 | # Create output directory if not already present
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| 102 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
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| 103 |
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| 104 | # Create directories for object files if directory does not exist
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| 105 | # Needed when obj-y := dir/file.o syntax is used
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| 106 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
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| 107 | endif
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| 108 |
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| 109 | ifndef obj
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| 110 | $(warning kbuild: Makefile.build is included improperly)
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| 111 | endif
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| 112 |
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| 113 | # ===========================================================================
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| 114 |
|
| 115 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
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| 116 | lib-target := $(obj)/lib.a
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| 117 | endif
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| 118 |
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| 119 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
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| 120 | builtin-target := $(obj)/built-in.o
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| 121 | endif
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| 122 |
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| 123 | modorder-target := $(obj)/modules.order
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| 124 |
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| 125 | # We keep a list of all modules in $(MODVERDIR)
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| 126 |
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| 127 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
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| 128 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
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| 129 | $(subdir-ym) $(always)
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| 130 | @:
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| 131 |
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| 132 | # Linus' kernel sanity checking tool
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| 133 | ifneq ($(KBUILD_CHECKSRC),0)
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| 134 | ifeq ($(KBUILD_CHECKSRC),2)
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| 135 | quiet_cmd_force_checksrc = CHECK $<
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| 136 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
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| 137 | else
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| 138 | quiet_cmd_checksrc = CHECK $<
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| 139 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
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| 140 | endif
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| 141 | endif
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| 142 |
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| 143 | # Do section mismatch analysis for each module/built-in.o
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| 144 | ifdef CONFIG_DEBUG_SECTION_MISMATCH
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| 145 | cmd_secanalysis = ; scripts/mod/modpost $@
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| 146 | endif
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| 147 |
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| 148 | # Compile C sources (.c)
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| 149 | # ---------------------------------------------------------------------------
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| 150 |
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| 151 | # Default is built-in, unless we know otherwise
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| 152 | modkern_cflags = \
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| 153 | $(if $(part-of-module), \
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| 154 | $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
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| 155 | $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
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| 156 | quiet_modtag := $(empty) $(empty)
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| 157 |
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| 158 | $(real-objs-m) : part-of-module := y
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| 159 | $(real-objs-m:.o=.i) : part-of-module := y
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| 160 | $(real-objs-m:.o=.s) : part-of-module := y
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| 161 | $(real-objs-m:.o=.lst): part-of-module := y
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| 162 |
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| 163 | $(real-objs-m) : quiet_modtag := [M]
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| 164 | $(real-objs-m:.o=.i) : quiet_modtag := [M]
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| 165 | $(real-objs-m:.o=.s) : quiet_modtag := [M]
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| 166 | $(real-objs-m:.o=.lst): quiet_modtag := [M]
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| 167 |
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| 168 | $(obj-m) : quiet_modtag := [M]
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| 169 |
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| 170 | # Default for not multi-part modules
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| 171 | modname = $(basetarget)
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| 172 |
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| 173 | $(multi-objs-m) : modname = $(modname-multi)
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| 174 | $(multi-objs-m:.o=.i) : modname = $(modname-multi)
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| 175 | $(multi-objs-m:.o=.s) : modname = $(modname-multi)
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| 176 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
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| 177 | $(multi-objs-y) : modname = $(modname-multi)
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| 178 | $(multi-objs-y:.o=.i) : modname = $(modname-multi)
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| 179 | $(multi-objs-y:.o=.s) : modname = $(modname-multi)
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| 180 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
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| 181 |
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| 182 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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| 183 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
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| 184 |
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| 185 | $(obj)/%.s: $(src)/%.c FORCE
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| 186 | $(call if_changed_dep,cc_s_c)
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| 187 |
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| 188 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
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| 189 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
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| 190 |
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| 191 | $(obj)/%.i: $(src)/%.c FORCE
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| 192 | $(call if_changed_dep,cc_i_c)
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| 193 |
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| 194 | cmd_gensymtypes = \
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| 195 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
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| 196 | $(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH) \
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| 197 | $(if $(KBUILD_PRESERVE),-p) \
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| 198 | -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
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| 199 |
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| 200 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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| 201 | cmd_cc_symtypes_c = \
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| 202 | set -e; \
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| 203 | $(call cmd_gensymtypes,true,$@) >/dev/null; \
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| 204 | test -s $@ || rm -f $@
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| 205 |
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| 206 | $(obj)/%.symtypes : $(src)/%.c FORCE
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| 207 | $(call cmd,cc_symtypes_c)
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| 208 |
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| 209 | # C (.c) files
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| 210 | # The C file is compiled and updated dependency information is generated.
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| 211 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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| 212 |
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| 213 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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| 214 |
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| 215 | ifndef CONFIG_MODVERSIONS
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| 216 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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| 217 |
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| 218 | else
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| 219 | # When module versioning is enabled the following steps are executed:
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| 220 | # o compile a .tmp_<file>.o from <file>.c
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| 221 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
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| 222 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and
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| 223 | # are done.
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| 224 | # o otherwise, we calculate symbol versions using the good old
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| 225 | # genksyms on the preprocessed source and postprocess them in a way
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| 226 | # that they are usable as a linker script
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| 227 | # o generate <file>.o from .tmp_<file>.o using the linker to
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| 228 | # replace the unresolved symbols __crc_exported_symbol with
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| 229 | # the actual value of the checksum generated by genksyms
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| 230 |
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| 231 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
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| 232 | cmd_modversions = \
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| 233 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
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| 234 | $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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| 235 | > $(@D)/.tmp_$(@F:.o=.ver); \
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| 236 | \
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| 237 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
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| 238 | -T $(@D)/.tmp_$(@F:.o=.ver); \
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| 239 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
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| 240 | else \
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| 241 | mv -f $(@D)/.tmp_$(@F) $@; \
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| 242 | fi;
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| 243 | endif
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| 244 |
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| 245 | ifdef CONFIG_FTRACE_MCOUNT_RECORD
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| 246 | ifdef BUILD_C_RECORDMCOUNT
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| 247 | # Due to recursion, we must skip empty.o.
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| 248 | # The empty.o file is created in the make process in order to determine
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| 249 | # the target endianness and word size. It is made before all other C
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| 250 | # files, including recordmcount.
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| 251 | sub_cmd_record_mcount = \
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| 252 | if [ $(@) != "scripts/mod/empty.o" ]; then \
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| 253 | $(objtree)/scripts/recordmcount "$(@)"; \
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| 254 | fi;
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| 255 | else
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| 256 | sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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| 257 | "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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| 258 | "$(if $(CONFIG_64BIT),64,32)" \
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| 259 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
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| 260 | "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
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| 261 | "$(if $(part-of-module),1,0)" "$(@)";
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| 262 | endif
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| 263 | cmd_record_mcount = \
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| 264 | if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then \
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| 265 | $(sub_cmd_record_mcount) \
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| 266 | fi;
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| 267 | endif
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| 268 |
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| 269 | define rule_cc_o_c
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| 270 | $(call echo-cmd,checksrc) $(cmd_checksrc) \
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| 271 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
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| 272 | $(cmd_modversions) \
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| 273 | $(call echo-cmd,record_mcount) \
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| 274 | $(cmd_record_mcount) \
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| 275 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
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| 276 | $(dot-target).tmp; \
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| 277 | rm -f $(depfile); \
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| 278 | mv -f $(dot-target).tmp $(dot-target).cmd
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| 279 | endef
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| 280 |
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| 281 | # Built-in and composite module parts
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| 282 | $(obj)/%.o: $(src)/%.c FORCE
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| 283 | $(call cmd,force_checksrc)
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| 284 | $(call if_changed_rule,cc_o_c)
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| 285 |
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| 286 | # Single-part modules are special since we need to mark them in $(MODVERDIR)
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| 287 |
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| 288 | $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
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| 289 | $(call cmd,force_checksrc)
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| 290 | $(call if_changed_rule,cc_o_c)
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| 291 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
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| 292 |
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| 293 | quiet_cmd_cc_lst_c = MKLST $@
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| 294 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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| 295 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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| 296 | System.map $(OBJDUMP) > $@
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| 297 |
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| 298 | $(obj)/%.lst: $(src)/%.c FORCE
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| 299 | $(call if_changed_dep,cc_lst_c)
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| 300 |
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| 301 | # Compile assembler sources (.S)
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| 302 | # ---------------------------------------------------------------------------
|
| 303 |
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| 304 | modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
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| 305 |
|
| 306 | $(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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| 307 | $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
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| 308 |
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| 309 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
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| 310 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
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| 311 |
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| 312 | $(obj)/%.s: $(src)/%.S FORCE
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| 313 | $(call if_changed_dep,as_s_S)
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| 314 |
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| 315 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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| 316 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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| 317 |
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| 318 | $(obj)/%.o: $(src)/%.S FORCE
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| 319 | $(call if_changed_dep,as_o_S)
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| 320 |
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| 321 | targets += $(real-objs-y) $(real-objs-m) $(lib-y)
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| 322 | targets += $(extra-y) $(MAKECMDGOALS) $(always)
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| 323 |
|
| 324 | # Linker scripts preprocessor (.lds.S -> .lds)
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| 325 | # ---------------------------------------------------------------------------
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| 326 | quiet_cmd_cpp_lds_S = LDS $@
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| 327 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
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| 328 | -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
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| 329 |
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| 330 | $(obj)/%.lds: $(src)/%.lds.S FORCE
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| 331 | $(call if_changed_dep,cpp_lds_S)
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| 332 |
|
| 333 | # Build the compiled-in targets
|
| 334 | # ---------------------------------------------------------------------------
|
| 335 |
|
| 336 | # To build objects in subdirs, we need to descend into the directories
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| 337 | $(sort $(subdir-obj-y)): $(subdir-ym) ;
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| 338 |
|
| 339 | #
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| 340 | # Rule to compile a set of .o files into one .o file
|
| 341 | #
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| 342 | ifdef builtin-target
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| 343 | quiet_cmd_link_o_target = LD $@
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| 344 | # If the list of objects to link is empty, just create an empty built-in.o
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| 345 | cmd_link_o_target = $(if $(strip $(obj-y)),\
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| 346 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
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| 347 | $(cmd_secanalysis),\
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| 348 | rm -f $@; $(AR) rcs $@)
|
| 349 |
|
| 350 | $(builtin-target): $(obj-y) FORCE
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| 351 | $(call if_changed,link_o_target)
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| 352 |
|
| 353 | targets += $(builtin-target)
|
| 354 | endif # builtin-target
|
| 355 |
|
| 356 | #
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| 357 | # Rule to create modules.order file
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| 358 | #
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| 359 | # Create commands to either record .ko file or cat modules.order from
|
| 360 | # a subdirectory
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| 361 | modorder-cmds = \
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| 362 | $(foreach m, $(modorder), \
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| 363 | $(if $(filter %/modules.order, $m), \
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| 364 | cat $m;, echo kernel/$m;))
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| 365 |
|
| 366 | $(modorder-target): $(subdir-ym) FORCE
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| 367 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@
|
| 368 |
|
| 369 | #
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| 370 | # Rule to compile a set of .o files into one .a file
|
| 371 | #
|
| 372 | ifdef lib-target
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| 373 | quiet_cmd_link_l_target = AR $@
|
| 374 | cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
|
| 375 |
|
| 376 | $(lib-target): $(lib-y) FORCE
|
| 377 | $(call if_changed,link_l_target)
|
| 378 |
|
| 379 | targets += $(lib-target)
|
| 380 | endif
|
| 381 |
|
| 382 | #
|
| 383 | # Rule to link composite objects
|
| 384 | #
|
| 385 | # Composite objects are specified in kbuild makefile as follows:
|
| 386 | # <composite-object>-objs := <list of .o files>
|
| 387 | # or
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| 388 | # <composite-object>-y := <list of .o files>
|
| 389 | link_multi_deps = \
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| 390 | $(filter $(addprefix $(obj)/, \
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| 391 | $($(subst $(obj)/,,$(@:.o=-objs))) \
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| 392 | $($(subst $(obj)/,,$(@:.o=-y)))), $^)
|
| 393 |
|
| 394 | quiet_cmd_link_multi-y = LD $@
|
| 395 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
|
| 396 |
|
| 397 | quiet_cmd_link_multi-m = LD [M] $@
|
| 398 | cmd_link_multi-m = $(cmd_link_multi-y)
|
| 399 |
|
| 400 | # We would rather have a list of rules like
|
| 401 | # foo.o: $(foo-objs)
|
| 402 | # but that's not so easy, so we rather make all composite objects depend
|
| 403 | # on the set of all their parts
|
| 404 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE
|
| 405 | $(call if_changed,link_multi-y)
|
| 406 |
|
| 407 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE
|
| 408 | $(call if_changed,link_multi-m)
|
| 409 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
|
| 410 |
|
| 411 | targets += $(multi-used-y) $(multi-used-m)
|
| 412 |
|
| 413 |
|
| 414 | # Descending
|
| 415 | # ---------------------------------------------------------------------------
|
| 416 |
|
| 417 | PHONY += $(subdir-ym)
|
| 418 | $(subdir-ym):
|
| 419 | $(Q)$(MAKE) $(build)=$@
|
| 420 |
|
| 421 | # Add FORCE to the prequisites of a target to force it to be always rebuilt.
|
| 422 | # ---------------------------------------------------------------------------
|
| 423 |
|
| 424 | PHONY += FORCE
|
| 425 |
|
| 426 | FORCE:
|
| 427 |
|
| 428 | # Read all saved command lines and dependencies for the $(targets) we
|
| 429 | # may be building above, using $(if_changed{,_dep}). As an
|
| 430 | # optimization, we don't need to read them if the target does not
|
| 431 | # exist, we will rebuild anyway in that case.
|
| 432 |
|
| 433 | targets := $(wildcard $(sort $(targets)))
|
| 434 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
|
| 435 |
|
| 436 | ifneq ($(cmd_files),)
|
| 437 | include $(cmd_files)
|
| 438 | endif
|
| 439 |
|
| 440 | # Declare the contents of the .PHONY variable as phony. We keep that
|
| 441 | # information in a variable se we can use it in if_changed and friends.
|
| 442 |
|
| 443 | .PHONY: $(PHONY)
|