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# genhdr-y  - Same as header-y but in a generated/ directory
7#
8# ==========================================================================
9
10# generated header directory
11gen := $(if $(gen),$(gen),$(subst include/,include/generated/,$(obj)))
12
13kbuild-file := $(srctree)/$(obj)/Kbuild
14include $(kbuild-file)
15
16# called may set destination dir (when installing to asm/)
17_dst := $(if $(destination-y),$(destination-y),$(if $(dst),$(dst),$(obj)))
18
19old-kbuild-file := $(srctree)/$(subst uapi/,,$(obj))/Kbuild
20ifneq ($(wildcard $(old-kbuild-file)),)
21include $(old-kbuild-file)
22endif
23
24include scripts/Kbuild.include
25
26installdir    := $(INSTALL_HDR_PATH)/$(subst uapi/,,$(_dst))
27
28header-y      := $(sort $(header-y))
29subdirs       := $(patsubst %/,%,$(filter %/, $(header-y)))
30header-y      := $(filter-out %/, $(header-y))
31
32# files used to track state of install/check
33install-file  := $(installdir)/.install
34check-file    := $(installdir)/.check
35
36# generic-y list all files an architecture uses from asm-generic
37# Use this to build a list of headers which require a wrapper
38wrapper-files := $(filter $(header-y), $(generic-y))
39
40srcdir        := $(srctree)/$(obj)
41gendir        := $(objtree)/$(gen)
42
43# all headers files for this dir
44header-y      := $(filter-out $(generic-y), $(header-y))
45all-files     := $(header-y) $(genhdr-y) $(wrapper-files)
46output-files  := $(addprefix $(installdir)/, $(all-files))
47
48# Check that all expected files exist
49$(foreach hdr, $(header-y), \
50  $(if $(wildcard $(srcdir)/$(hdr)),, \
51       $(error Missing UAPI file $(srcdir)/$(hdr)) \
52   ))
53$(foreach hdr, $(genhdr-y), \
54  $(if	$(wildcard $(gendir)/$(hdr)),, \
55       $(error Missing generated UAPI file $(gendir)/$(hdr)) \
56  ))
57
58# Work out what needs to be removed
59oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
60unwanted      := $(filter-out $(all-files),$(oldheaders))
61
62# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
63unwanted-file := $(addprefix $(installdir)/, $(unwanted))
64
65printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
66
67quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
68                            file$(if $(word 2, $(all-files)),s))
69      cmd_install = \
70        $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-y); \
71        $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-y); \
72        for F in $(wrapper-files); do                                   \
73                echo "\#include <asm-generic/$$F>" > $(installdir)/$$F;    \
74        done;                                                           \
75        touch $@
76
77quiet_cmd_remove = REMOVE  $(unwanted)
78      cmd_remove = rm -f $(unwanted-file)
79
80quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)
81# Headers list can be pretty long, xargs helps to avoid
82# the "Argument list too long" error.
83      cmd_check = for f in $(all-files); do                          \
84                  echo "$(installdir)/$${f}"; done                      \
85                  | xargs                                            \
86                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
87	          touch $@
88
89PHONY += __headersinst __headerscheck
90
91ifndef HDRCHECK
92# Rules for installing headers
93__headersinst: $(subdirs) $(install-file)
94	@:
95
96targets += $(install-file)
97$(install-file): scripts/headers_install.sh \
98		 $(addprefix $(srcdir)/,$(header-y)) \
99		 $(addprefix $(gendir)/,$(genhdr-y)) FORCE
100	$(if $(unwanted),$(call cmd,remove),)
101	$(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
102	$(call if_changed,install)
103
104else
105__headerscheck: $(subdirs) $(check-file)
106	@:
107
108targets += $(check-file)
109$(check-file): scripts/headers_check.pl $(output-files) FORCE
110	$(call if_changed,check)
111
112endif
113
114# Recursion
115.PHONY: $(subdirs)
116$(subdirs):
117	$(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(_dst)/$@
118
119targets := $(wildcard $(sort $(targets)))
120cmd_files := $(wildcard \
121             $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
122
123ifneq ($(cmd_files),)
124	include $(cmd_files)
125endif
126
127.PHONY: $(PHONY)
128PHONY += FORCE
129FORCE: ;
130