# SPDX-License-Identifier: GPL-2.0 # ========================================================================== # Installing headers # # All headers under include/uapi, include/generated/uapi, # arch//include/uapi and arch//include/generated/uapi are # exported. # They are preprocessed to remove __KERNEL__ section of the file. # # ========================================================================== PHONY := __headers __headers: include scripts/Kbuild.include srcdir := $(srctree)/$(obj) # When make is run under a fakechroot environment, the function # $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular # files. So, we are using a combination of sort/dir/wildcard which works # with fakechroot. subdirs := $(patsubst $(srcdir)/%/,%,\ $(filter-out $(srcdir)/,\ $(sort $(dir $(wildcard $(srcdir)/*/))))) # Recursion __headers: $(subdirs) PHONY += $(subdirs) $(subdirs): $(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(dst)/$@ # Skip header install/check for include/uapi and arch/$(SRCARCH)/include/uapi. # We have only sub-directories there. skip-inst := $(if $(filter %/uapi,$(obj)),1) ifeq ($(skip-inst),) # Kbuild file is optional kbuild-file := $(srctree)/$(obj)/Kbuild -include $(kbuild-file) installdir := $(INSTALL_HDR_PATH)/$(dst) gendir := $(objtree)/$(subst include/,include/generated/,$(obj)) header-files := $(notdir $(wildcard $(srcdir)/*.h)) header-files += $(notdir $(wildcard $(srcdir)/*.agh)) header-files := $(filter-out $(no-export-headers), $(header-files)) genhdr-files := $(notdir $(wildcard $(gendir)/*.h)) genhdr-files := $(filter-out $(header-files), $(genhdr-files)) # files used to track state of install/check install-file := $(installdir)/.install check-file := $(installdir)/.check # all headers files for this dir all-files := $(header-files) $(genhdr-files) output-files := $(addprefix $(installdir)/, $(all-files)) ifneq ($(mandatory-y),) missing := $(filter-out $(all-files),$(mandatory-y)) ifneq ($(missing),) $(error Some mandatory headers ($(missing)) are missing in $(obj)) endif endif # Work out what needs to be removed oldheaders := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h)) unwanted := $(filter-out $(all-files),$(oldheaders)) # Prefix unwanted with full paths to $(INSTALL_HDR_PATH) unwanted-file := $(addprefix $(installdir)/, $(unwanted)) printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@)) quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\ file$(if $(word 2, $(all-files)),s)) cmd_install = \ $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \ $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \ touch $@ quiet_cmd_remove = REMOVE $(unwanted) cmd_remove = rm -f $(unwanted-file) quiet_cmd_check = CHECK $(printdir) ($(words $(all-files)) files) # Headers list can be pretty long, xargs helps to avoid # the "Argument list too long" error. cmd_check = for f in $(all-files); do \ echo "$(installdir)/$${f}"; done \ | xargs \ $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \ touch $@ ifndef HDRCHECK # Rules for installing headers __headers: $(install-file) @: targets += $(install-file) $(install-file): scripts/headers_install.sh \ $(addprefix $(srcdir)/,$(header-files)) \ $(addprefix $(gendir)/,$(genhdr-files)) FORCE $(if $(unwanted),$(call cmd,remove),) $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@))) $(call if_changed,install) else __headers: $(check-file) @: targets += $(check-file) $(check-file): scripts/headers_check.pl $(output-files) FORCE $(call if_changed,check) endif cmd_files := $(wildcard \ $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),) include $(cmd_files) endif endif # skip-inst PHONY += FORCE FORCE: ; .PHONY: $(PHONY)