# 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

  kernelsymfile := $(objtree)/Module.symvers
  modulesymfile := $(firstword $(KBUILD_EXTMOD))/Module.symvers
  
  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))			\
  	$(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS)))	\
  	$(if $(KBUILD_EXTMOD),-o $(modulesymfile))			\
  	$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)			\

  	$(if $(KBUILD_MODPOST_WARN),-w)					\
  	$(if $(filter nsdeps,$(MAKECMDGOALS)),-d)

  
  ifdef MODPOST_VMLINUX

  quiet_cmd_modpost = MODPOST vmlinux.o
        cmd_modpost = $(MODPOST) vmlinux.o

  __modpost:

  	$(call cmd,modpost)
  
  else

  # When building external modules load the Kbuild file to retrieve EXTRA_SYMBOLS info

  ifneq ($(KBUILD_EXTMOD),)

  
  # set src + obj - they may be used when building the .mod.c file
  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)
  endif

  MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - $(wildcard vmlinux)

  # find all modules listed in modules.order

  modules := $(sort $(shell cat $(MODORDER)))

  # Read out modules.order instead of expanding $(modules) to pass in modpost.
  # Otherwise, allmodconfig would fail with "Argument list too long".

  quiet_cmd_modpost = MODPOST $(words $(modules)) modules

        cmd_modpost = sed 's/ko$$/o/' $(MODORDER) | $(MODPOST)

  __modpost:
  	@$(kecho) '  Building modules, stage 2.'

  	$(call cmd,modpost)

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

  nsdeps: __modpost

  endif

  .PHONY: $(PHONY)