linux/scripts/Makefile.asm-generic
Masahiro Yamada a2430b25c3 kbuild: add kbuild-file macro
While building, installing, cleaning, Kbuild visits sub-directories
and includes 'Kbuild' or 'Makefile' that exists there.

Add 'kbuild-file' macro, and reuse it from scripts/Makefie.*

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Reviewed-by: Alexander Lobakin <alobakin@pm.me>
Tested-by: Alexander Lobakin <alobakin@pm.me>
2022-11-22 23:40:02 +09:00

59 lines
1.8 KiB
Makefile

# SPDX-License-Identifier: GPL-2.0
# include/asm-generic contains a lot of files that are used
# verbatim by several architectures.
#
# This Makefile reads the file arch/$(SRCARCH)/include/(uapi/)/asm/Kbuild
# and for each file listed in this file with generic-y creates
# a small wrapper file in arch/$(SRCARCH)/include/generated/(uapi/)/asm.
PHONY := all
all:
src := $(subst /generated,,$(obj))
include $(srctree)/scripts/Kbuild.include
-include $(kbuild-file)
# $(generic)/Kbuild lists mandatory-y. Exclude um since it is a special case.
ifneq ($(SRCARCH),um)
include $(srctree)/$(generic)/Kbuild
endif
redundant := $(filter $(mandatory-y) $(generated-y), $(generic-y))
redundant += $(foreach f, $(generic-y), $(if $(wildcard $(srctree)/$(src)/$(f)),$(f)))
redundant := $(sort $(redundant))
$(if $(redundant),\
$(warning redundant generic-y found in $(src)/Kbuild: $(redundant)))
# If arch does not implement mandatory headers, fallback to asm-generic ones.
mandatory-y := $(filter-out $(generated-y), $(mandatory-y))
generic-y += $(foreach f, $(mandatory-y), $(if $(wildcard $(srctree)/$(src)/$(f)),,$(f)))
generic-y := $(addprefix $(obj)/, $(generic-y))
generated-y := $(addprefix $(obj)/, $(generated-y))
# Remove stale wrappers when the corresponding files are removed from generic-y
old-headers := $(wildcard $(obj)/*.h)
unwanted := $(filter-out $(generic-y) $(generated-y),$(old-headers))
quiet_cmd_wrap = WRAP $@
cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
quiet_cmd_remove = REMOVE $(unwanted)
cmd_remove = rm -f $(unwanted)
all: $(generic-y)
$(if $(unwanted),$(call cmd,remove))
@:
$(obj)/%.h:
$(call cmd,wrap)
# Create output directory. Skip it if at least one old header exists
# since we know the output directory already exists.
ifeq ($(old-headers),)
$(shell mkdir -p $(obj))
endif
.PHONY: $(PHONY)