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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