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scripts/Makefile.modpost
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# =========================================================================== # Module versions # =========================================================================== # # Stage one of module building created the following: # a) The individual .o files used for the module |
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# b) A <module>.o file which is the .o files above linked together |
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# c) A <module>.mod file in $(MODVERDIR)/, listing the name of the # the preliminary <module>.o file, plus all .o files # Stage 2 is handled by this file and does the following # 1) Find all modules from the files listed in $(MODVERDIR)/ # 2) modpost is then used to # 3) create one <module>.mod.c file pr. module # 4) create one Module.symvers file with CRC for all exported symbols # 5) compile all <module>.mod.c files |
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# 6) final link of the module to a <module.ko> file |
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# Step 3 is used to place certain information in the module's ELF # section, including information such as: |
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# Version magic (see include/linux/vermagic.h for full details) |
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# - Kernel release # - SMP is CONFIG_SMP # - PREEMPT is CONFIG_PREEMPT # - GCC Version # Module info # - Module version (MODULE_VERSION) # - Module alias'es (MODULE_ALIAS) # - Module license (MODULE_LICENSE) # - See include/linux/module.h for more details # Step 4 is solely used to allow module versioning in external modules, |
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# where the CRC of each module is retrieved from the Module.symvers file. |
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# KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined # symbols in the final module linking stage # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules. |
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# This is solely useful to speed up test compiles |
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PHONY := _modpost |
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_modpost: __modpost |
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include include/config/auto.conf |
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include scripts/Kbuild.include |
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# When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info |
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ifneq ($(KBUILD_EXTMOD),) |
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# set src + obj - they may be used when building the .mod.c file obj := $(KBUILD_EXTMOD) src := $(obj) |
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# Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \ $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile) endif |
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include scripts/Makefile.lib |
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kernelsymfile := $(objtree)/Module.symvers |
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modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers |
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# Step 1), find all modules listed in $(MODVERDIR)/ |
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MODLISTCMD := find $(MODVERDIR) -name '*.mod' | xargs -r grep -h '\.ko$$' | sort -u __modules := $(shell $(MODLISTCMD)) |
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modules := $(patsubst %.o,%.ko, $(wildcard $(__modules:.ko=.o))) |
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# Stop after building .o files if NOFINAL is set. Makes compile tests quicker _modpost: $(if $(KBUILD_MODPOST_NOFINAL), $(modules:.ko:.o),$(modules)) |
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# Step 2), invoke modpost # Includes step 3,4 |
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modpost = scripts/mod/modpost \ $(if $(CONFIG_MODVERSIONS),-m) \ $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a,) \ $(if $(KBUILD_EXTMOD),-i,-o) $(kernelsymfile) \ $(if $(KBUILD_EXTMOD),-I $(modulesymfile)) \ |
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$(if $(KBUILD_EXTRA_SYMBOLS), $(patsubst %, -e %,$(KBUILD_EXTRA_SYMBOLS))) \ |
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$(if $(KBUILD_EXTMOD),-o $(modulesymfile)) \ |
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$(if $(CONFIG_DEBUG_SECTION_MISMATCH),,-S) \ |
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$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \ |
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$(if $(KBUILD_EXTMOD)$(KBUILD_MODPOST_WARN),-w) |
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MODPOST_OPT=$(subst -i,-n,$(filter -i,$(MAKEFLAGS))) |
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# We can go over command line length here, so be careful. |
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quiet_cmd_modpost = MODPOST $(words $(filter-out vmlinux FORCE, $^)) modules |
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cmd_modpost = $(MODLISTCMD) | sed 's/\.ko$$/.o/' | $(modpost) $(MODPOST_OPT) -s -T - |
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PHONY += __modpost |
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__modpost: $(modules:.ko=.o) FORCE |
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$(call cmd,modpost) $(wildcard vmlinux) |
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quiet_cmd_kernel-mod = MODPOST $@ |
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cmd_kernel-mod = $(modpost) $@ |
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vmlinux.o: FORCE |
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$(call cmd,kernel-mod) |
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# Declare generated files as targets for modpost $(symverfile): __modpost ; $(modules:.ko=.mod.c): __modpost ; # Step 5), compile all *.mod.c files # modname is set to make c_flags define KBUILD_MODNAME |
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modname = $(notdir $(@:.mod.o=)) |
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quiet_cmd_cc_o_c = CC $@ |
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cmd_cc_o_c = $(CC) $(c_flags) $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE) \ |
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-c -o $@ $< $(modules:.ko=.mod.o): %.mod.o: %.mod.c FORCE $(call if_changed_dep,cc_o_c) targets += $(modules:.ko=.mod.o) |
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ARCH_POSTLINK := $(wildcard $(srctree)/arch/$(SRCARCH)/Makefile.postlink) # Step 6), final link of the modules with optional arch pass after final link |
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quiet_cmd_ld_ko_o = LD [M] $@ |
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cmd_ld_ko_o = \ $(LD) -r $(LDFLAGS) \ $(KBUILD_LDFLAGS_MODULE) $(LDFLAGS_MODULE) \ -o $@ $(filter-out FORCE,$^) ; \ $(if $(ARCH_POSTLINK), $(MAKE) -f $(ARCH_POSTLINK) $@, true) |
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$(modules): %.ko :%.o %.mod.o FORCE |
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+$(call if_changed,ld_ko_o) |
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targets += $(modules) # Add FORCE to the prequisites of a target to force it to be always rebuilt. # --------------------------------------------------------------------------- |
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PHONY += FORCE |
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FORCE: # Read all saved command lines and dependencies for the $(targets) we # may be building above, using $(if_changed{,_dep}). As an # optimization, we don't need to read them if the target does not # exist, we will rebuild anyway in that case. targets := $(wildcard $(sort $(targets))) cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),) include $(cmd_files) endif |
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# Declare the contents of the .PHONY variable as phony. We keep that # information in a variable se we can use it in if_changed and friends. .PHONY: $(PHONY) |