1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
5 # All headers under include/uapi, include/generated/uapi,
6 # arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
8 # They are preprocessed to remove __KERNEL__ section of the file.
10 # ==========================================================================
15 include $(srctree)/scripts/Kbuild.include
17 src := $(srctree)/$(obj)
18 gen := $(objtree)/$(subst include/,include/generated/,$(obj))
21 -include $(src)/Kbuild
23 # $(filter %/, ...) is a workaround for GNU Make <= 4.2.1, where
24 # $(wildcard $(src)/*/) contains not only directories but also regular files.
25 src-subdirs := $(patsubst $(src)/%/,%,$(filter %/, $(wildcard $(src)/*/)))
26 gen-subdirs := $(patsubst $(gen)/%/,%,$(filter %/, $(wildcard $(gen)/*/)))
27 all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
29 src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
30 src-headers := $(filter-out $(no-export-headers), $(src-headers))
31 gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
32 gen-headers := $(filter-out $(no-export-headers), $(gen-headers))
34 # If the same header is exported from source and generated directories,
35 # the former takes precedence, but this should be warned.
36 duplicated := $(filter $(gen-headers), $(src-headers))
37 $(if $(duplicated), $(warning duplicated header export: $(duplicated)))
39 gen-headers := $(filter-out $(duplicated), $(gen-headers))
42 all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
43 src-headers := $(addprefix $(dst)/, $(src-headers))
44 gen-headers := $(addprefix $(dst)/, $(gen-headers))
45 all-headers := $(src-headers) $(gen-headers)
47 # Work out what needs to be removed
48 old-subdirs := $(wildcard $(all-subdirs))
49 old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
50 unwanted := $(filter-out $(all-headers), $(old-headers))
53 existing-dirs := $(sort $(dir $(old-headers)))
54 wanted-dirs := $(sort $(dir $(all-headers)))
55 new-dirs := $(filter-out $(existing-dirs), $(wanted-dirs))
56 $(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
59 quiet_cmd_install = HDRINST $@
60 cmd_install = $(CONFIG_SHELL) $(srctree)/scripts/headers_install.sh $< $@
62 $(src-headers): $(dst)/%.h: $(src)/%.h $(srctree)/scripts/headers_install.sh FORCE
63 $(call if_changed,install)
65 $(gen-headers): $(dst)/%.h: $(gen)/%.h $(srctree)/scripts/headers_install.sh FORCE
66 $(call if_changed,install)
68 quiet_cmd_remove = REMOVE $(unwanted)
69 cmd_remove = rm -f $(unwanted)
71 __headers: $(all-headers)
77 existing-headers := $(filter $(old-headers), $(all-headers))
79 -include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)