scripts/Makefile.headersinst

   1 # SPDX-License-Identifier: GPL-2.0
   2 # ==========================================================================
   3 # Installing headers
   4 #
   5 # All headers under include/uapi, include/generated/uapi,
   6 # arch/<arch>/include/uapi and arch/<arch>/include/generated/uapi are
   7 # exported.
   8 # They are preprocessed to remove __KERNEL__ section of the file.
   9 #
  10 # ==========================================================================
  11
  12 PHONY := __headers
  13 __headers:
  14
  15 include scripts/Kbuild.include
  16
  17 srcdir        := $(srctree)/$(obj)
  18
  19 # When make is run under a fakechroot environment, the function
  20 # $(wildcard $(srcdir)/*/.) doesn't only return directories, but also regular
  21 # files. So, we are using a combination of sort/dir/wildcard which works
  22 # with fakechroot.
  23 subdirs       := $(patsubst $(srcdir)/%/,%,\
  24                  $(filter-out $(srcdir)/,\
  25                  $(sort $(dir $(wildcard $(srcdir)/*/)))))
  26
  27 # Recursion
  28 __headers: $(subdirs)
  29
  30 PHONY += $(subdirs)
  31 $(subdirs):
  32         $(Q)$(MAKE) $(hdr-inst)=$(obj)/$@ dst=$(dst)/$@
  33
  34 # Skip header install/check for include/uapi and arch/$(SRCARCH)/include/uapi.
  35 # We have only sub-directories there.
  36 skip-inst := $(if $(filter %/uapi,$(obj)),1)
  37
  38 ifeq ($(skip-inst),)
  39
  40 # Kbuild file is optional
  41 kbuild-file := $(srctree)/$(obj)/Kbuild
  42 -include $(kbuild-file)
  43
  44 installdir    := $(INSTALL_HDR_PATH)/$(dst)
  45 gendir        := $(objtree)/$(subst include/,include/generated/,$(obj))
  46 header-files  := $(notdir $(wildcard $(srcdir)/*.h))
  47 header-files  := $(filter-out $(no-export-headers), $(header-files))
  48 genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))
  49 genhdr-files  := $(filter-out $(header-files), $(genhdr-files))
  50
  51 # files used to track state of install/check
  52 install-file  := $(installdir)/.install
  53 check-file    := $(installdir)/.check
  54
  55 # all headers files for this dir
  56 all-files     := $(header-files) $(genhdr-files)
  57 output-files  := $(addprefix $(installdir)/, $(all-files))
  58
  59 # Work out what needs to be removed
  60 oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
  61 unwanted      := $(filter-out $(all-files),$(oldheaders))
  62
  63 # Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
  64 unwanted-file := $(addprefix $(installdir)/, $(unwanted))
  65
  66 printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
  67
  68 quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
  69                             file$(if $(word 2, $(all-files)),s))
  70       cmd_install = \
  71         $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
  72         $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
  73         touch $@
  74
  75 quiet_cmd_remove = REMOVE  $(unwanted)
  76       cmd_remove = rm -f $(unwanted-file)
  77
  78 quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)
  79 # Headers list can be pretty long, xargs helps to avoid
  80 # the "Argument list too long" error.
  81       cmd_check = for f in $(all-files); do                          \
  82                   echo "$(installdir)/$${f}"; done                      \
  83                   | xargs                                            \
  84                   $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
  85                   touch $@
  86
  87 ifndef HDRCHECK
  88 # Rules for installing headers
  89 __headers: $(install-file)
  90         @:
  91
  92 targets += $(install-file)
  93 $(install-file): scripts/headers_install.sh \
  94                  $(addprefix $(srcdir)/,$(header-files)) \
  95                  $(addprefix $(gendir)/,$(genhdr-files)) FORCE
  96         $(if $(unwanted),$(call cmd,remove),)
  97         $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
  98         $(call if_changed,install)
  99
 100 else
 101 __headers: $(check-file)
 102         @:
 103
 104 targets += $(check-file)
 105 $(check-file): scripts/headers_check.pl $(output-files) FORCE
 106         $(call if_changed,check)
 107
 108 endif
 109
 110 cmd_files := $(wildcard \
 111              $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
 112
 113 ifneq ($(cmd_files),)
 114         include $(cmd_files)
 115 endif
 116
 117 endif # skip-inst
 118
 119 PHONY += FORCE
 120 FORCE: ;
 121
 122 .PHONY: $(PHONY)