Makefile.headers

include plugins/include/uapi/Makefile.headers
include src/include/uapi/Makefile.headers

#
# Headers which need to be prepared before we can use them.
# Mostly because we share headers between libcompel and plugins,
# thus to not duplicate code we create a symlinks.
#
# Anoter reason -- architecture dependent headers and user api:
# some headers require architecture specific data.
#
plugins/include/uapi/asm: plugins/include/uapi/arch/$(ARCH)
	$(E) "  GEN     " $@
	$(shell $(CD) plugins/include/uapi && $(LN) -s arch/$(ARCH)/asm asm)
plugins-headers-prepare-targets += plugins/include/uapi/asm

plugins/include/uapi/asm-generic/int.h: src/include/asm-generic/int.h
	$(E) "  GEN     " $@
	$(shell $(CD) $(dir $@) && $(LN) -s ../../../../src/include/asm-generic/int.h int.h)
plugins-headers-prepare-targets += plugins/include/uapi/asm-generic/int.h

plugins/include/uapi/arch/$(ARCH)/asm/sigset.h: | plugins/include/uapi/asm
plugins/include/uapi/arch/$(ARCH)/asm/sigset.h: src/lib/arch/$(ARCH)/include/asm/sigset.h
	$(E) "  GEN     " $@
	$(shell $(CD) $(dir $@) && $(LN) -s ../../../../../../src/lib/arch/$(ARCH)/include/asm/sigset.h sigset.h)
plugins-headers-prepare-targets += plugins/include/uapi/arch/$(ARCH)/asm/sigset.h

plugins-headers-prepare: $(plugins-headers-prepare-targets)
	@true

clean-plugins-headers-prepared:
	$(E) "  CLEANUP " $(plugins-headers-prepare-targets)
	$(Q) $(RM) plugins/include/uapi/asm
	$(Q) $(RM) plugins/include/uapi/asm-generic/int.h
	$(Q) $(RM) plugins/include/uapi/arch/$(ARCH)/asm/sigset.h

.PHONY: plugins-headers-prepare clean-plugins-headers-prepared

header-y-all		:=
plugin-header-dir	:=
plugin-subdirs		:=

#
# Headers installation helpers, takes <headers-dst-dir> as a directory
# name where headers are to be installed

# libcompel headers are copied without any modification
define header-copy-to
$(1)/$(2): $(3)/$(2)
	$$(E) "  GEN     " $$@
	$$(Q) $$(CP) -u $(3)/$(2) $(1)/$(2)
header-y-all += $(1)/$(2)
endef

$(foreach header,$(header-y),								\
	$(eval $(call header-copy-to,$(headers-dst-dir),$(header),src/include/uapi)))

#
# plugin headers require additional handling
#
# - generate subdirectories where needed
#
# - substitute "uapi/" in includes to directory name
#   where headers will be installed
define plugin-header-copy-to
$(1)/$(2): $(3)/$(2)
	$$(E) "  GEN     " $$@
	$$(Q) $$(CAT) $$^ | $$(SED) -e 's/\"uapi\//\"compel\//g' > $$@
ifneq ($(filter-out ./%,$(dir $(2))),)
plugin-header-dir += $(dir $(2))
endif
header-y-all += $(1)/$(2)
endef

$(foreach header,$(plugin-header-y),								\
	$(eval $(call plugin-header-copy-to,$(headers-dst-dir),$(header),plugins/include/uapi)))

define gen-headers-subdirs
$(1)/$(2):
	$$(E) "  GEN     " $$@
	$$(Q) $$(MKDIR) -p $$@
plugin-subdirs += $(1)/$(2)
endef

$(foreach subdir,$(sort $(plugin-header-dir)),							\
	$(eval $(call gen-headers-subdirs,$(headers-dst-dir),$(subdir))))

$(plugin-subdirs): | plugins-headers-prepare
$(header-y-all): | $(plugin-subdirs)

install-headers: $(header-y-all)
	@true

.PHONY: install-headers