1# ==========================================================================
2# Installing headers
3#
4# All headers under include/uapi, include/generated/uapi,
5# arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
6# exported.
7# They are preprocessed to remove __KERNEL__ section of the file.
8#
9# ==========================================================================
10
11PHONY := __headers
12__headers:
13
14include scripts/Kbuild.include
15
16srcdir        := $(srctree)/$(obj)
17
18# When make is run under a fakechroot environment, the function
19# $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular
20# files. So, we are using a combination of sort/dir/wildcard which works
21# with fakechroot.
22subdirs       := $(patsubst $(srcdir)/%/,%,\
23		 $(filter-out $(srcdir)/,\
24		 $(sort $(dir $(wildcard $(srcdir)/*/)))))
25
26# caller may set destination dir (when installing to asm/)
27_dst          := $(if $(dst),$(dst),$(obj))
28
29# Recursion
30__headers: $(subdirs)
31
32.PHONY: $(subdirs)
33$(subdirs):
34	$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(_dst)/$@
35
36# Skip header install/check for include/uapi and arch/$(hdr-arch)/include/uapi.
37# We have only sub-directories there.
38skip-inst := $(if $(filter %/uapi,$(obj)),1)
39
40ifeq ($(skip-inst),)
41
42# generated header directory
43gen := $(if $(gen),$(gen),$(subst include/,include/generated/,$(obj)))
44
45# Kbuild file is optional
46kbuild-file := $(srctree)/$(obj)/Kbuild
47-include $(kbuild-file)
48
49old-kbuild-file := $(srctree)/$(subst uapi/,,$(obj))/Kbuild
50ifneq ($(wildcard $(old-kbuild-file)),)
51include $(old-kbuild-file)
52endif
53
54installdir    := $(INSTALL_HDR_PATH)/$(subst uapi/,,$(_dst))
55
56gendir        := $(objtree)/$(gen)
57header-files  := $(notdir $(wildcard $(srcdir)/*.h))
58header-files  += $(notdir $(wildcard $(srcdir)/*.agh))
59header-files  := $(filter-out $(no-export-headers), $(header-files))
60genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))
61genhdr-files  := $(filter-out $(header-files), $(genhdr-files))
62
63# files used to track state of install/check
64install-file  := $(installdir)/.install
65check-file    := $(installdir)/.check
66
67# generic-y list all files an architecture uses from asm-generic
68# Use this to build a list of headers which require a wrapper
69generic-files := $(notdir $(wildcard $(srctree)/include/uapi/asm-generic/*.h))
70wrapper-files := $(filter $(generic-files), $(generic-y))
71wrapper-files := $(filter-out $(header-files), $(wrapper-files))
72
73# all headers files for this dir
74all-files     := $(header-files) $(genhdr-files) $(wrapper-files)
75output-files  := $(addprefix $(installdir)/, $(all-files))
76
77ifneq ($(mandatory-y),)
78missing       := $(filter-out $(all-files),$(mandatory-y))
79ifneq ($(missing),)
80$(error Some mandatory headers ($(missing)) are missing in $(obj))
81endif
82endif
83
84# Work out what needs to be removed
85oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
86unwanted      := $(filter-out $(all-files),$(oldheaders))
87
88# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
89unwanted-file := $(addprefix $(installdir)/, $(unwanted))
90
91printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
92
93quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
94                            file$(if $(word 2, $(all-files)),s))
95      cmd_install = \
96        $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
97        $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
98        for F in $(wrapper-files); do                                   \
99                echo "\#include <asm-generic/$$F>" > $(installdir)/$$F;    \
100        done;                                                           \
101        touch $@
102
103quiet_cmd_remove = REMOVE  $(unwanted)
104      cmd_remove = rm -f $(unwanted-file)
105
106quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)
107# Headers list can be pretty long, xargs helps to avoid
108# the "Argument list too long" error.
109      cmd_check = for f in $(all-files); do                          \
110                  echo "$(installdir)/$${f}"; done                      \
111                  | xargs                                            \
112                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
113	          touch $@
114
115ifndef HDRCHECK
116# Rules for installing headers
117__headers: $(install-file)
118	@:
119
120targets += $(install-file)
121$(install-file): scripts/headers_install.sh \
122		 $(addprefix $(srcdir)/,$(header-files)) \
123		 $(addprefix $(gendir)/,$(genhdr-files)) FORCE
124	$(if $(unwanted),$(call cmd,remove),)
125	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
126	$(call if_changed,install)
127
128else
129__headers: $(check-file)
130	@:
131
132targets += $(check-file)
133$(check-file): scripts/headers_check.pl $(output-files) FORCE
134	$(call if_changed,check)
135
136endif
137
138targets := $(wildcard $(sort $(targets)))
139cmd_files := $(wildcard \
140             $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
141
142ifneq ($(cmd_files),)
143	include $(cmd_files)
144endif
145
146endif # skip-inst
147
148.PHONY: $(PHONY)
149PHONY += FORCE
150FORCE: ;
151