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)
131