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VPATH is used in Kbuild to make pattern rules search for prerequisites in both $(objtree) and $(srctree). Some of *.c, *.S files are not real sources, but generated by tools such as flex, bison, perl. In contrast, I doubt the benefit of --include-dir=$(abs_srctree) because it is always clear which Makefiles are real sources, and which are not. So, my hope is to add $(srctree)/ prefix to all check-in Makefiles, then remove --include-dir=$(abs_srctree) flag in the future. I am touching only some Kbuild core parts for now. Treewide fixes will be needed to achieve this goal. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
85 lines
2.9 KiB
Makefile
85 lines
2.9 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ==========================================================================
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# Installing headers
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#
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# All headers under include/uapi, include/generated/uapi,
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# arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
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# exported.
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# They are preprocessed to remove __KERNEL__ section of the file.
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#
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# ==========================================================================
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PHONY := __headers
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__headers:
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include $(srctree)/scripts/Kbuild.include
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src := $(srctree)/$(obj)
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gen := $(objtree)/$(subst include/,include/generated/,$(obj))
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dst := usr/include
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-include $(src)/Kbuild
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# $(filter %/, ...) is a workaround for GNU Make <= 4.2.1, where
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# $(wildcard $(src)/*/) contains not only directories but also regular files.
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src-subdirs := $(patsubst $(src)/%/,%,$(filter %/, $(wildcard $(src)/*/)))
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gen-subdirs := $(patsubst $(gen)/%/,%,$(filter %/, $(wildcard $(gen)/*/)))
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all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
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src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
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src-headers := $(filter-out $(no-export-headers), $(src-headers))
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gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
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gen-headers := $(filter-out $(no-export-headers), $(gen-headers))
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# If the same header is exported from source and generated directories,
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# the former takes precedence, but this should be warned.
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duplicated := $(filter $(gen-headers), $(src-headers))
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$(if $(duplicated), $(warning duplicated header export: $(duplicated)))
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gen-headers := $(filter-out $(duplicated), $(gen-headers))
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# Add dst path prefix
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all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
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src-headers := $(addprefix $(dst)/, $(src-headers))
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gen-headers := $(addprefix $(dst)/, $(gen-headers))
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all-headers := $(src-headers) $(gen-headers)
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# Work out what needs to be removed
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old-subdirs := $(wildcard $(all-subdirs))
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old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
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unwanted := $(filter-out $(all-headers), $(old-headers))
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# Create directories
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existing-dirs := $(sort $(dir $(old-headers)))
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wanted-dirs := $(sort $(dir $(all-headers)))
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new-dirs := $(filter-out $(existing-dirs), $(wanted-dirs))
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$(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
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# Rules
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quiet_cmd_install = HDRINST $@
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cmd_install = $(CONFIG_SHELL) $(srctree)/scripts/headers_install.sh $< $@
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$(src-headers): $(dst)/%.h: $(src)/%.h $(srctree)/scripts/headers_install.sh FORCE
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$(call if_changed,install)
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$(gen-headers): $(dst)/%.h: $(gen)/%.h $(srctree)/scripts/headers_install.sh FORCE
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$(call if_changed,install)
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quiet_cmd_remove = REMOVE $(unwanted)
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cmd_remove = rm -f $(unwanted)
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__headers: $(all-headers)
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ifneq ($(unwanted),)
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$(call cmd,remove)
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endif
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@:
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existing-headers := $(filter $(old-headers), $(all-headers))
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-include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)
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PHONY += FORCE
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FORCE:
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.PHONY: $(PHONY)
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