Eric Lee / smarc-fsl-linux-kernel

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81f7e3824   Eric Lee   Initial Release, ... 
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  # SPDX-License-Identifier: GPL-2.0
  # ==========================================================================
  # Installing headers
  #
  # All headers under include/uapi, include/generated/uapi,
  # arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
  # exported.
  # They are preprocessed to remove __KERNEL__ section of the file.
  #
  # ==========================================================================
  
  PHONY := __headers
  __headers:
  
  include scripts/Kbuild.include
  
  srcdir        := $(srctree)/$(obj)
  
  # When make is run under a fakechroot environment, the function
  # $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular
  # files. So, we are using a combination of sort/dir/wildcard which works
  # with fakechroot.
  subdirs       := $(patsubst $(srcdir)/%/,%,\
  		 $(filter-out $(srcdir)/,\
  		 $(sort $(dir $(wildcard $(srcdir)/*/)))))
  
  # Recursion
  __headers: $(subdirs)
  
  .PHONY: $(subdirs)
  $(subdirs):
  	$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(dst)/$@
  
  # Skip header install/check for include/uapi and arch/$(hdr-arch)/include/uapi.
  # We have only sub-directories there.
  skip-inst := $(if $(filter %/uapi,$(obj)),1)
  
  ifeq ($(skip-inst),)
  
  # Kbuild file is optional
  kbuild-file := $(srctree)/$(obj)/Kbuild
  -include $(kbuild-file)
  
  installdir    := $(INSTALL_HDR_PATH)/$(dst)
  gendir        := $(objtree)/$(subst include/,include/generated/,$(obj))
  header-files  := $(notdir $(wildcard $(srcdir)/*.h))
  header-files  += $(notdir $(wildcard $(srcdir)/*.agh))
  header-files  := $(filter-out $(no-export-headers), $(header-files))
  genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))
  genhdr-files  := $(filter-out $(header-files), $(genhdr-files))
  
  # files used to track state of install/check
  install-file  := $(installdir)/.install
  check-file    := $(installdir)/.check
  
  # all headers files for this dir
  all-files     := $(header-files) $(genhdr-files)
  output-files  := $(addprefix $(installdir)/, $(all-files))
  
  ifneq ($(mandatory-y),)
  missing       := $(filter-out $(all-files),$(mandatory-y))
  ifneq ($(missing),)
  $(error Some mandatory headers ($(missing)) are missing in $(obj))
  endif
  endif
  
  # Work out what needs to be removed
  oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
  unwanted      := $(filter-out $(all-files),$(oldheaders))
  
  # Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
  unwanted-file := $(addprefix $(installdir)/, $(unwanted))
  
  printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
  
  quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
                              file$(if $(word 2, $(all-files)),s))
        cmd_install = \
          $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
          $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
          touch $@
  
  quiet_cmd_remove = REMOVE  $(unwanted)
        cmd_remove = rm -f $(unwanted-file)
  
  quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)
  # Headers list can be pretty long, xargs helps to avoid
  # the "Argument list too long" error.
        cmd_check = for f in $(all-files); do                          \
                    echo "$(installdir)/$${f}"; done                      \
                    | xargs                                            \
                    $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
  	          touch $@
  
  ifndef HDRCHECK
  # Rules for installing headers
  __headers: $(install-file)
  	@:
  
  targets += $(install-file)
  $(install-file): scripts/headers_install.sh \
  		 $(addprefix $(srcdir)/,$(header-files)) \
  		 $(addprefix $(gendir)/,$(genhdr-files)) FORCE
  	$(if $(unwanted),$(call cmd,remove),)
  	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
  	$(call if_changed,install)
  
  else
  __headers: $(check-file)
  	@:
  
  targets += $(check-file)
  $(check-file): scripts/headers_check.pl $(output-files) FORCE
  	$(call if_changed,check)
  
  endif
  
  targets := $(wildcard $(sort $(targets)))
  cmd_files := $(wildcard \
               $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
  
  ifneq ($(cmd_files),)
  	include $(cmd_files)
  endif
  
  endif # skip-inst
  
  .PHONY: $(PHONY)
  PHONY += FORCE
  FORCE: ;