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  := $(filter-out $(no-export-headers), $(header-files))
48genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))
49genhdr-files  := $(filter-out $(header-files), $(genhdr-files))
50
51# files used to track state of install/check
52install-file  := $(installdir)/.install
53check-file    := $(installdir)/.check
54
55# all headers files for this dir
56all-files     := $(header-files) $(genhdr-files)
57output-files  := $(addprefix $(installdir)/, $(all-files))
58
59# Work out what needs to be removed
60oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
61unwanted      := $(filter-out $(all-files),$(oldheaders))
62
63# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
64unwanted-file := $(addprefix $(installdir)/, $(unwanted))
65
66printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
67
68quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
69                            file$(if $(word 2, $(all-files)),s))
70      cmd_install = \
71        $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
72        $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
73        touch $@
74
75quiet_cmd_remove = REMOVE  $(unwanted)
76      cmd_remove = rm -f $(unwanted-file)
77
78quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)
79# Headers list can be pretty long, xargs helps to avoid
80# the "Argument list too long" error.
81      cmd_check = for f in $(all-files); do                          \
82                  echo "$(installdir)/$${f}"; done                      \
83                  | xargs                                            \
84                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
85	          touch $@
86
87ifndef HDRCHECK
88# Rules for installing headers
89__headers: $(install-file)
90	@:
91
92targets += $(install-file)
93$(install-file): scripts/headers_install.sh \
94		 $(addprefix $(srcdir)/,$(header-files)) \
95		 $(addprefix $(gendir)/,$(genhdr-files)) FORCE
96	$(if $(unwanted),$(call cmd,remove),)
97	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
98	$(call if_changed,install)
99
100else
101__headers: $(check-file)
102	@:
103
104targets += $(check-file)
105$(check-file): scripts/headers_check.pl $(output-files) FORCE
106	$(call if_changed,check)
107
108endif
109
110cmd_files := $(wildcard \
111             $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
112
113ifneq ($(cmd_files),)
114	include $(cmd_files)
115endif
116
117endif # skip-inst
118
119PHONY += FORCE
120FORCE: ;
121
122.PHONY: $(PHONY)
123