# SPDX-License-Identifier: GPL-2.0

  # ===========================================================================
  # Module versions
  # ===========================================================================
  #
  # Stage one of module building created the following:
  # a) The individual .o files used for the module

  # b) A <module>.o file which is the .o files above linked together

  # c) A <module>.mod file, listing the name of the preliminary <module>.o file,
  #    plus all .o files

  # d) modules.order, which lists all the modules

  
  # Stage 2 is handled by this file and does the following

  # 1) Find all modules listed in modules.order

  # 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

  
  # Step 3 is used to place certain information in the module's ELF
  # section, including information such as:

  #   Version magic (see include/linux/vermagic.h for full details)

  #     - Kernel release
  #     - SMP is CONFIG_SMP

  #     - PREEMPT is CONFIG_PREEMPT[_RT]

  #     - 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,

  # where the CRC of each module is retrieved from the Module.symvers file.

  # 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.

  # This is solely useful to speed up test compiles

  
  PHONY := __modpost
  __modpost:

  include include/config/auto.conf

  include scripts/Kbuild.include

  MODPOST = scripts/mod/modpost								\
  	$(if $(CONFIG_MODVERSIONS),-m)							\
  	$(if $(CONFIG_MODULE_SRCVERSION_ALL),-a)					\

  	$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)					\

  	$(if $(KBUILD_MODPOST_WARN),-w) \
  	-o $@

  
  ifdef MODPOST_VMLINUX

  quiet_cmd_modpost = MODPOST $@
        cmd_modpost = $(MODPOST) $<

  vmlinux.symvers: vmlinux.o

  	$(call cmd,modpost)

  __modpost: vmlinux.symvers

  else

  ifeq ($(KBUILD_EXTMOD),)

  
  input-symdump := vmlinux.symvers

  output-symdump := Module.symvers

  else

  # set src + obj - they may be used in the modules's Makefile

  obj := $(KBUILD_EXTMOD)
  src := $(obj)

  # Include the module's Makefile to find KBUILD_EXTRA_SYMBOLS
  include $(if $(wildcard $(KBUILD_EXTMOD)/Kbuild), \
               $(KBUILD_EXTMOD)/Kbuild, $(KBUILD_EXTMOD)/Makefile)

  
  # modpost option for external modules
  MODPOST += -e

  input-symdump := Module.symvers $(KBUILD_EXTRA_SYMBOLS)

  output-symdump := $(KBUILD_EXTMOD)/Module.symvers

  endif

  # modpost options for modules (both in-kernel and external)
  MODPOST += \

  	$(addprefix -i ,$(wildcard $(input-symdump))) \

  	$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \

  	$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N)

  # 'make -i -k' ignores compile errors, and builds as many modules as possible.
  ifneq ($(findstring i,$(filter-out --%,$(MAKEFLAGS))),)
  MODPOST += -n
  endif

  # Clear VPATH to not search for *.symvers in $(srctree). Check only $(objtree).
  VPATH :=

  $(input-symdump):

  	@echo >&2 'WARNING: Symbol version dump "$@" is missing.'
  	@echo >&2 '         Modules may not have dependencies or modversions.'

  # Read out modules.order to pass in modpost.

  # Otherwise, allmodconfig would fail with "Argument list too long".

  quiet_cmd_modpost = MODPOST $@

        cmd_modpost = sed 's/ko$$/o/' $< | $(MODPOST) -T -

  $(output-symdump): $(MODORDER) $(input-symdump) FORCE
  	$(call if_changed,modpost)
  
  targets += $(output-symdump)

  
  __modpost: $(output-symdump)

  ifneq ($(KBUILD_MODPOST_NOFINAL),1)
  	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
  endif

  PHONY += FORCE
  FORCE:

  existing-targets := $(wildcard $(sort $(targets)))
  
  -include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)

  endif

  .PHONY: $(PHONY)