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