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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
17srcdir := $(srctree)/$(obj)
18
19# When make is run under a fakechroot environment, the function
20# $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular
21# files. So, we are using a combination of sort/dir/wildcard which works
22# with fakechroot.
23subdirs := $(patsubst $(srcdir)/%/,%,\
24 $(filter-out $(srcdir)/,\
25 $(sort $(dir $(wildcard $(srcdir)/*/)))))
26
27# Recursion
28__headers: $(subdirs)
29
30PHONY += $(subdirs)
31$(subdirs):
32 $(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(dst)/$@
33
34# Skip header install/check for include/uapi and arch/$(SRCARCH)/include/uapi.
35# We have only sub-directories there.
36skip-inst := $(if $(filter %/uapi,$(obj)),1)
37
38ifeq ($(skip-inst),)
39
40# Kbuild file is optional
41kbuild-file := $(srctree)/$(obj)/Kbuild
42-include $(kbuild-file)
43
44installdir := $(INSTALL_HDR_PATH)/$(dst)
45gendir := $(objtree)/$(subst include/,include/generated/,$(obj))
46header-files := $(notdir $(wildcard $(srcdir)/*.h))
47header-files += $(notdir $(wildcard $(srcdir)/*.agh))
48header-files := $(filter-out $(no-export-headers), $(header-files))
49genhdr-files := $(notdir $(wildcard $(gendir)/*.h))
50genhdr-files := $(filter-out $(header-files), $(genhdr-files))
51
52# files used to track state of install/check
53install-file := $(installdir)/.install
54check-file := $(installdir)/.check
55
56# all headers files for this dir
57all-files := $(header-files) $(genhdr-files)
58output-files := $(addprefix $(installdir)/, $(all-files))
59
60ifneq ($(mandatory-y),)
61missing := $(filter-out $(all-files),$(mandatory-y))
62ifneq ($(missing),)
63$(error Some mandatory headers ($(missing)) are missing in $(obj))
64endif
65endif
66
67# Work out what needs to be removed
68oldheaders := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
69unwanted := $(filter-out $(all-files),$(oldheaders))
70
71# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
72unwanted-file := $(addprefix $(installdir)/, $(unwanted))
73
74printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
75
76quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
77 file$(if $(word 2, $(all-files)),s))
78 cmd_install = \
79 $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
80 $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
81 touch $@
82
83quiet_cmd_remove = REMOVE $(unwanted)
84 cmd_remove = rm -f $(unwanted-file)
85
86quiet_cmd_check = CHECK $(printdir) ($(words $(all-files)) files)
87# Headers list can be pretty long, xargs helps to avoid
88# the "Argument list too long" error.
89 cmd_check = for f in $(all-files); do \
90 echo "$(installdir)/$${f}"; done \
91 | xargs \
92 $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
93 touch $@
94
95ifndef HDRCHECK
96# Rules for installing headers
97__headers: $(install-file)
98 @:
99
100targets += $(install-file)
101$(install-file): scripts/headers_install.sh \
102 $(addprefix $(srcdir)/,$(header-files)) \
103 $(addprefix $(gendir)/,$(genhdr-files)) FORCE
104 $(if $(unwanted),$(call cmd,remove),)
105 $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
106 $(call if_changed,install)
107
108else
109__headers: $(check-file)
110 @:
111
112targets += $(check-file)
113$(check-file): scripts/headers_check.pl $(output-files) FORCE
114 $(call if_changed,check)
115
116endif
117
118cmd_files := $(wildcard \
119 $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
120
121ifneq ($(cmd_files),)
122 include $(cmd_files)
123endif
124
125endif # skip-inst
126
127PHONY += FORCE
128FORCE: ;
129
130.PHONY: $(PHONY)
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)