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 $(srctree)/scripts/Kbuild.include
16
17src := $(srctree)/$(obj)
18gen := $(objtree)/$(subst include/,include/generated/,$(obj))
19dst := usr/include
20
21-include $(src)/Kbuild
22
23# $(filter %/, ...) is a workaround for GNU Make <= 4.2.1, where
24# $(wildcard $(src)/*/) contains not only directories but also regular files.
25src-subdirs := $(patsubst $(src)/%/,%,$(filter %/, $(wildcard $(src)/*/)))
26gen-subdirs := $(patsubst $(gen)/%/,%,$(filter %/, $(wildcard $(gen)/*/)))
27all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
28
29src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
30src-headers := $(filter-out $(no-export-headers), $(src-headers))
31gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
32gen-headers := $(filter-out $(no-export-headers), $(gen-headers))
33
34# If the same header is exported from source and generated directories,
35# the former takes precedence, but this should be warned.
36duplicated := $(filter $(gen-headers), $(src-headers))
37$(if $(duplicated), $(warning duplicated header export: $(duplicated)))
38
39gen-headers := $(filter-out $(duplicated), $(gen-headers))
40
41# Add dst path prefix
42all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
43src-headers := $(addprefix $(dst)/, $(src-headers))
44gen-headers := $(addprefix $(dst)/, $(gen-headers))
45all-headers := $(src-headers) $(gen-headers)
46
47# Work out what needs to be removed
48old-subdirs := $(wildcard $(all-subdirs))
49old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
50unwanted    := $(filter-out $(all-headers), $(old-headers))
51
52# Create directories
53existing-dirs := $(sort $(dir $(old-headers)))
54wanted-dirs   := $(sort $(dir $(all-headers)))
55new-dirs      := $(filter-out $(existing-dirs), $(wanted-dirs))
56$(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
57
58# Rules
59quiet_cmd_install = HDRINST $@
60      cmd_install = $(CONFIG_SHELL) $(srctree)/scripts/headers_install.sh $< $@
61
62$(src-headers): $(dst)/%.h: $(src)/%.h $(srctree)/scripts/headers_install.sh FORCE
63	$(call if_changed,install)
64
65$(gen-headers): $(dst)/%.h: $(gen)/%.h $(srctree)/scripts/headers_install.sh FORCE
66	$(call if_changed,install)
67
68quiet_cmd_remove = REMOVE  $(unwanted)
69      cmd_remove = rm -f $(unwanted)
70
71__headers: $(all-headers)
72ifneq ($(unwanted),)
73	$(call cmd,remove)
74endif
75	@:
76
77existing-headers := $(filter $(old-headers), $(all-headers))
78
79-include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)
80
81PHONY += FORCE
82FORCE:
83
84.PHONY: $(PHONY)
85