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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
- src := $(srctree)/$(obj)
- gen := $(objtree)/$(subst include/,include/generated/,$(obj))
- dst := usr/include
- -include $(src)/Kbuild
- # $(filter %/, ...) is a workaround for GNU Make <= 4.2.1, where
- # $(wildcard $(src)/*/) contains not only directories but also regular files.
- src-subdirs := $(patsubst $(src)/%/,%,$(filter %/, $(wildcard $(src)/*/)))
- gen-subdirs := $(patsubst $(gen)/%/,%,$(filter %/, $(wildcard $(gen)/*/)))
- all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
- src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
- src-headers := $(filter-out $(no-export-headers), $(src-headers))
- gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
- gen-headers := $(filter-out $(no-export-headers), $(gen-headers))
- # If the same header is exported from source and generated directories,
- # the former takes precedence, but this should be warned.
- duplicated := $(filter $(gen-headers), $(src-headers))
- $(if $(duplicated), $(warning duplicated header export: $(duplicated)))
- gen-headers := $(filter-out $(duplicated), $(gen-headers))
- # Add dst path prefix
- all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
- src-headers := $(addprefix $(dst)/, $(src-headers))
- gen-headers := $(addprefix $(dst)/, $(gen-headers))
- all-headers := $(src-headers) $(gen-headers)
- # Work out what needs to be removed
- old-subdirs := $(wildcard $(all-subdirs))
- old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
- unwanted := $(filter-out $(all-headers), $(old-headers))
- # Create directories
- existing-dirs := $(sort $(dir $(old-headers)))
- wanted-dirs := $(sort $(dir $(all-headers)))
- new-dirs := $(filter-out $(existing-dirs), $(wanted-dirs))
- $(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
- # Rules
- quiet_cmd_install = HDRINST $@
- cmd_install = $(CONFIG_SHELL) $(srctree)/scripts/headers_install.sh $< $@
- $(src-headers): $(dst)/%.h: $(src)/%.h $(srctree)/scripts/headers_install.sh FORCE
- $(call if_changed,install)
- $(gen-headers): $(dst)/%.h: $(gen)/%.h $(srctree)/scripts/headers_install.sh FORCE
- $(call if_changed,install)
- quiet_cmd_remove = REMOVE $(unwanted)
- cmd_remove = rm -f $(unwanted)
- __headers: $(all-headers)
- ifneq ($(unwanted),)
- $(call cmd,remove)
- endif
- @:
- existing-headers := $(filter $(old-headers), $(all-headers))
- -include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)
- PHONY += FORCE
- FORCE:
- .PHONY: $(PHONY)
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