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TOMOYO Linux Cross Reference
Linux/scripts/Makefile.headersinst

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  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 
 12 PHONY := __headers
 13 __headers:
 14 
 15 include $(srctree)/scripts/Kbuild.include
 16 
 17 src := $(srctree)/$(obj)
 18 gen := $(objtree)/$(subst include/,include/generated/,$(obj))
 19 dst := 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.
 25 src-subdirs := $(patsubst $(src)/%/,%,$(filter %/, $(wildcard $(src)/*/)))
 26 gen-subdirs := $(patsubst $(gen)/%/,%,$(filter %/, $(wildcard $(gen)/*/)))
 27 all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
 28 
 29 src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
 30 src-headers := $(filter-out $(no-export-headers), $(src-headers))
 31 gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
 32 gen-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.
 36 duplicated := $(filter $(gen-headers), $(src-headers))
 37 $(if $(duplicated), $(warning duplicated header export: $(duplicated)))
 38 
 39 gen-headers := $(filter-out $(duplicated), $(gen-headers))
 40 
 41 # Add dst path prefix
 42 all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
 43 src-headers := $(addprefix $(dst)/, $(src-headers))
 44 gen-headers := $(addprefix $(dst)/, $(gen-headers))
 45 all-headers := $(src-headers) $(gen-headers)
 46 
 47 # Work out what needs to be removed
 48 old-subdirs := $(wildcard $(all-subdirs))
 49 old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
 50 unwanted    := $(filter-out $(all-headers), $(old-headers))
 51 
 52 # Create directories
 53 existing-dirs := $(sort $(dir $(old-headers)))
 54 wanted-dirs   := $(sort $(dir $(all-headers)))
 55 new-dirs      := $(filter-out $(existing-dirs), $(wanted-dirs))
 56 $(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
 57 
 58 # Rules
 59 quiet_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 
 68 quiet_cmd_remove = REMOVE  $(unwanted)
 69       cmd_remove = rm -f $(unwanted)
 70 
 71 __headers: $(all-headers)
 72 ifneq ($(unwanted),)
 73         $(call cmd,remove)
 74 endif
 75         @:
 76 
 77 existing-headers := $(filter $(old-headers), $(all-headers))
 78 
 79 -include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)
 80 
 81 PHONY += FORCE
 82 FORCE:
 83 
 84 .PHONY: $(PHONY)

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