scripts/Makefile.asm-generic

   1 # SPDX-License-Identifier: GPL-2.0
   2 # include/asm-generic contains a lot of files that are used
   3 # verbatim by several architectures.
   4 #
   5 # This Makefile reads the file arch/$(SRCARCH)/include/(uapi/)/asm/Kbuild
   6 # and for each file listed in this file with generic-y creates
   7 # a small wrapper file in arch/$(SRCARCH)/include/generated/(uapi/)/asm.
   8
   9 PHONY := all
  10 all:
  11
  12 src := $(subst /generated,,$(obj))
  13 -include $(src)/Kbuild
  14
  15 include scripts/Kbuild.include
  16
  17 generic-y   := $(addprefix $(obj)/, $(generic-y))
  18 generated-y := $(addprefix $(obj)/, $(generated-y))
  19
  20 # Remove stale wrappers when the corresponding files are removed from generic-y
  21 old-headers := $(wildcard $(obj)/*.h)
  22 unwanted    := $(filter-out $(generic-y) $(generated-y),$(old-headers))
  23
  24 quiet_cmd_wrap = WRAP    $@
  25       cmd_wrap = echo "\#include <asm-generic/$*.h>" > $@
  26
  27 quiet_cmd_remove = REMOVE  $(unwanted)
  28       cmd_remove = rm -f $(unwanted)
  29
  30 all: $(generic-y)
  31         $(if $(unwanted),$(call cmd,remove))
  32         @:
  33
  34 $(obj)/%.h:
  35         $(call cmd,wrap)
  36
  37 # Create output directory. Skip it if at least one old header exists
  38 # since we know the output directory already exists.
  39 ifeq ($(old-headers),)
  40 $(shell mkdir -p $(obj))
  41 endif
  42
  43 .PHONY: $(PHONY)