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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
12PHONY := __headers
13__headers:
14
15include 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)
1# ==========================================================================
2# Installing headers
3#
4# header-y - list files to be installed. They are preprocessed
5# to remove __KERNEL__ section of the file
6# objhdr-y - Same as header-y but for generated files
7#
8# ==========================================================================
9
10# called may set destination dir (when installing to asm/)
11_dst := $(if $(dst),$(dst),$(obj))
12
13kbuild-file := $(srctree)/$(obj)/Kbuild
14include $(kbuild-file)
15
16_dst := $(if $(destination-y),$(destination-y),$(_dst))
17
18include scripts/Kbuild.include
19
20install := $(INSTALL_HDR_PATH)/$(_dst)
21
22header-y := $(sort $(header-y))
23subdirs := $(patsubst %/,%,$(filter %/, $(header-y)))
24header-y := $(filter-out %/, $(header-y))
25
26# files used to track state of install/check
27install-file := $(install)/.install
28check-file := $(install)/.check
29
30# generic-y list all files an architecture uses from asm-generic
31# Use this to build a list of headers which require a wrapper
32wrapper-files := $(filter $(header-y), $(generic-y))
33
34# all headers files for this dir
35header-y := $(filter-out $(generic-y), $(header-y))
36all-files := $(header-y) $(objhdr-y) $(wrapper-files)
37input-files := $(addprefix $(srctree)/$(obj)/,$(header-y)) \
38 $(addprefix $(objtree)/$(obj)/,$(objhdr-y))
39output-files := $(addprefix $(install)/, $(all-files))
40
41# Work out what needs to be removed
42oldheaders := $(patsubst $(install)/%,%,$(wildcard $(install)/*.h))
43unwanted := $(filter-out $(all-files),$(oldheaders))
44
45# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
46unwanted-file := $(addprefix $(install)/, $(unwanted))
47
48printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
49
50quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
51 file$(if $(word 2, $(all-files)),s))
52 cmd_install = \
53 $(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \
54 $(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \
55 for F in $(wrapper-files); do \
56 echo "\#include <asm-generic/$$F>" > $(install)/$$F; \
57 done; \
58 touch $@
59
60quiet_cmd_remove = REMOVE $(unwanted)
61 cmd_remove = rm -f $(unwanted-file)
62
63quiet_cmd_check = CHECK $(printdir) ($(words $(all-files)) files)
64# Headers list can be pretty long, xargs helps to avoid
65# the "Argument list too long" error.
66 cmd_check = for f in $(all-files); do \
67 echo "$(install)/$${f}"; done \
68 | xargs \
69 $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
70 touch $@
71
72PHONY += __headersinst __headerscheck
73
74ifndef HDRCHECK
75# Rules for installing headers
76__headersinst: $(subdirs) $(install-file)
77 @:
78
79targets += $(install-file)
80$(install-file): scripts/headers_install.pl $(input-files) FORCE
81 $(if $(unwanted),$(call cmd,remove),)
82 $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
83 $(call if_changed,install)
84
85else
86__headerscheck: $(subdirs) $(check-file)
87 @:
88
89targets += $(check-file)
90$(check-file): scripts/headers_check.pl $(output-files) FORCE
91 $(call if_changed,check)
92
93endif
94
95# Recursion
96hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
97.PHONY: $(subdirs)
98$(subdirs):
99 $(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(_dst)/$@
100
101targets := $(wildcard $(sort $(targets)))
102cmd_files := $(wildcard \
103 $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
104
105ifneq ($(cmd_files),)
106 include $(cmd_files)
107endif
108
109.PHONY: $(PHONY)
110PHONY += FORCE
111FORCE: ;