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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# genhdr-y - Same as objhdr-y but in a generated directory
8#
9# ==========================================================================
10
11# called may set destination dir (when installing to asm/)
12_dst := $(if $(dst),$(dst),$(obj))
13
14# generated header directory
15gen := $(if $(gen),$(gen),$(subst include/,include/generated/,$(obj)))
16
17kbuild-file := $(srctree)/$(obj)/Kbuild
18include $(kbuild-file)
19
20_dst := $(if $(destination-y),$(destination-y),$(_dst))
21
22include scripts/Kbuild.include
23
24install := $(INSTALL_HDR_PATH)/$(_dst)
25
26header-y := $(sort $(header-y))
27subdirs := $(patsubst %/,%,$(filter %/, $(header-y)))
28header-y := $(filter-out %/, $(header-y))
29
30# files used to track state of install/check
31install-file := $(install)/.install
32check-file := $(install)/.check
33
34# generic-y list all files an architecture uses from asm-generic
35# Use this to build a list of headers which require a wrapper
36wrapper-files := $(filter $(header-y), $(generic-y))
37
38# all headers files for this dir
39header-y := $(filter-out $(generic-y), $(header-y))
40all-files := $(header-y) $(objhdr-y) $(genhdr-y) $(wrapper-files)
41input-files := $(addprefix $(srctree)/$(obj)/,$(header-y)) \
42 $(addprefix $(objtree)/$(obj)/,$(objhdr-y)) \
43 $(addprefix $(objtree)/$(gen)/,$(genhdr-y))
44output-files := $(addprefix $(install)/, $(all-files))
45
46# Work out what needs to be removed
47oldheaders := $(patsubst $(install)/%,%,$(wildcard $(install)/*.h))
48unwanted := $(filter-out $(all-files),$(oldheaders))
49
50# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
51unwanted-file := $(addprefix $(install)/, $(unwanted))
52
53printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
54
55quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
56 file$(if $(word 2, $(all-files)),s))
57 cmd_install = \
58 $(PERL) $< $(srctree)/$(obj) $(install) $(SRCARCH) $(header-y); \
59 $(PERL) $< $(objtree)/$(obj) $(install) $(SRCARCH) $(objhdr-y); \
60 $(PERL) $< $(objtree)/$(gen) $(install) $(SRCARCH) $(genhdr-y); \
61 for F in $(wrapper-files); do \
62 echo "\#include <asm-generic/$$F>" > $(install)/$$F; \
63 done; \
64 touch $@
65
66quiet_cmd_remove = REMOVE $(unwanted)
67 cmd_remove = rm -f $(unwanted-file)
68
69quiet_cmd_check = CHECK $(printdir) ($(words $(all-files)) files)
70# Headers list can be pretty long, xargs helps to avoid
71# the "Argument list too long" error.
72 cmd_check = for f in $(all-files); do \
73 echo "$(install)/$${f}"; done \
74 | xargs \
75 $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
76 touch $@
77
78PHONY += __headersinst __headerscheck
79
80ifndef HDRCHECK
81# Rules for installing headers
82__headersinst: $(subdirs) $(install-file)
83 @:
84
85targets += $(install-file)
86$(install-file): scripts/headers_install.pl $(input-files) FORCE
87 $(if $(unwanted),$(call cmd,remove),)
88 $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
89 $(call if_changed,install)
90
91else
92__headerscheck: $(subdirs) $(check-file)
93 @:
94
95targets += $(check-file)
96$(check-file): scripts/headers_check.pl $(output-files) FORCE
97 $(call if_changed,check)
98
99endif
100
101# Recursion
102hdr-inst := -rR -f $(srctree)/scripts/Makefile.headersinst obj
103.PHONY: $(subdirs)
104$(subdirs):
105 $(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(_dst)/$@
106
107targets := $(wildcard $(sort $(targets)))
108cmd_files := $(wildcard \
109 $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
110
111ifneq ($(cmd_files),)
112 include $(cmd_files)
113endif
114
115.PHONY: $(PHONY)
116PHONY += FORCE
117FORCE: ;