LXR linux/scripts/Makefile.headersinst

   1# SPDX-License-Identifier: GPL-2.0
   2# ==========================================================================
   3# Installing headers
   4#
   5# All headers under include/uapi, include/generated/uapi,
   6# arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
   7# exported.
   8# They are preprocessed to remove __KERNEL__ section of the file.
   9#
  10# ==========================================================================
  11
  12PHONY := __headers
  13__headers:
  14
  15include $(srctree)/scripts/Kbuild.include
  16
  17src := $(srctree)/$(obj)
  18gen := $(objtree)/$(subst include/,include/generated/,$(obj))
  19dst := usr/include
  20
  21-include $(src)/Kbuild
  22
  23# $(filter %/, ...) is a workaround for GNU Make <= 4.2.1, where
  24# $(wildcard $(src)/*/) contains not only directories but also regular files.
  25src-subdirs := $(patsubst $(src)/%/,%,$(filter %/, $(wildcard $(src)/*/)))
  26gen-subdirs := $(patsubst $(gen)/%/,%,$(filter %/, $(wildcard $(gen)/*/)))
  27all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
  28
  29src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
  30src-headers := $(filter-out $(no-export-headers), $(src-headers))
  31gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
  32gen-headers := $(filter-out $(no-export-headers), $(gen-headers))
  33
  34# If the same header is exported from source and generated directories,
  35# the former takes precedence, but this should be warned.
  36duplicated := $(filter $(gen-headers), $(src-headers))
  37$(if $(duplicated), $(warning duplicated header export: $(duplicated)))
  38
  39gen-headers := $(filter-out $(duplicated), $(gen-headers))
  40
  41# Add dst path prefix
  42all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
  43src-headers := $(addprefix $(dst)/, $(src-headers))
  44gen-headers := $(addprefix $(dst)/, $(gen-headers))
  45all-headers := $(src-headers) $(gen-headers)
  46
  47# Work out what needs to be removed
  48old-subdirs := $(wildcard $(all-subdirs))
  49old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
  50unwanted    := $(filter-out $(all-headers), $(old-headers))
  51
  52# Create directories
  53existing-dirs := $(sort $(dir $(old-headers)))
  54wanted-dirs   := $(sort $(dir $(all-headers)))
  55new-dirs      := $(filter-out $(existing-dirs), $(wanted-dirs))
  56$(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
  57
  58# Rules
  59quiet_cmd_install = HDRINST $@
  60      cmd_install = $(CONFIG_SHELL) $(srctree)/scripts/headers_install.sh $< $@
  61
  62$(src-headers): $(dst)/%.h: $(src)/%.h $(srctree)/scripts/headers_install.sh FORCE
  63        $(call if_changed,install)
  64
  65$(gen-headers): $(dst)/%.h: $(gen)/%.h $(srctree)/scripts/headers_install.sh FORCE
  66        $(call if_changed,install)
  67
  68quiet_cmd_remove = REMOVE  $(unwanted)
  69      cmd_remove = rm -f $(unwanted)
  70
  71__headers: $(all-headers)
  72ifneq ($(unwanted),)
  73        $(call cmd,remove)
  74endif
  75        @:
  76
  77existing-headers := $(filter $(old-headers), $(all-headers))
  78
  79-include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)
  80
  81PHONY += FORCE
  82FORCE:
  83
  84.PHONY: $(PHONY)
  85