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
23src-subdirs := $(patsubst $(src)/%/,%,$(wildcard $(src)/*/))
24gen-subdirs := $(patsubst $(gen)/%/,%,$(wildcard $(gen)/*/))
25all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
26
27src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
28src-headers := $(filter-out $(no-export-headers), $(src-headers))
29gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
30gen-headers := $(filter-out $(no-export-headers), $(gen-headers))
31
32# If the same header is exported from source and generated directories,
33# the former takes precedence, but this should be warned.
34duplicated := $(filter $(gen-headers), $(src-headers))
35$(if $(duplicated), $(warning duplicated header export: $(duplicated)))
36
37gen-headers := $(filter-out $(duplicated), $(gen-headers))
38
39# Add dst path prefix
40all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
41src-headers := $(addprefix $(dst)/, $(src-headers))
42gen-headers := $(addprefix $(dst)/, $(gen-headers))
43all-headers := $(src-headers) $(gen-headers)
44
45# Work out what needs to be removed
46old-subdirs := $(wildcard $(all-subdirs))
47old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
48unwanted    := $(filter-out $(all-headers), $(old-headers))
49
50# Create directories
51existing-dirs := $(sort $(dir $(old-headers)))
52wanted-dirs   := $(sort $(dir $(all-headers)))
53new-dirs      := $(filter-out $(existing-dirs), $(wanted-dirs))
54$(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
55
56# Rules
57
58ifndef HDRCHECK
59
60quiet_cmd_install = HDRINST $@
61      cmd_install = $(CONFIG_SHELL) $(srctree)/scripts/headers_install.sh $(@D) $(<D) $(@F)
62
63$(src-headers): $(dst)/%.h: $(src)/%.h $(srctree)/scripts/headers_install.sh FORCE
64	$(call if_changed,install)
65
66$(gen-headers): $(dst)/%.h: $(gen)/%.h $(srctree)/scripts/headers_install.sh FORCE
67	$(call if_changed,install)
68
69quiet_cmd_remove = REMOVE  $(unwanted)
70      cmd_remove = rm -f $(unwanted)
71
72__headers: $(all-headers)
73ifneq ($(unwanted),)
74	$(call cmd,remove)
75endif
76	@:
77
78existing-headers := $(filter $(old-headers), $(all-headers))
79
80-include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)
81
82else
83
84quiet_cmd_check = HDRCHK  $<
85      cmd_check = $(PERL) $(srctree)/scripts/headers_check.pl $(dst) $(SRCARCH) $<; touch $@
86
87check-files := $(addsuffix .chk, $(all-headers))
88
89$(check-files): $(dst)/%.chk : $(dst)/% $(srctree)/scripts/headers_check.pl
90	$(call cmd,check)
91
92__headers: $(check-files)
93	@:
94
95endif
96
97PHONY += FORCE
98FORCE:
99
100.PHONY: $(PHONY)
101