LXR linux/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
  12PHONY := __headers
  13__headers:
  14
  15include scripts/Kbuild.include
  16
  17srcdir        := $(srctree)/$(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.
  23subdirs       := $(patsubst $(srcdir)/%/,%,\
  24                 $(filter-out $(srcdir)/,\
  25                 $(sort $(dir $(wildcard $(srcdir)/*/)))))
  26
  27# Recursion
  28__headers: $(subdirs)
  29
  30PHONY += $(subdirs)
  31$(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.
  36skip-inst := $(if $(filter %/uapi,$(obj)),1)
  37
  38ifeq ($(skip-inst),)
  39
  40# Kbuild file is optional
  41kbuild-file := $(srctree)/$(obj)/Kbuild
  42-include $(kbuild-file)
  43
  44installdir    := $(INSTALL_HDR_PATH)/$(dst)
  45gendir        := $(objtree)/$(subst include/,include/generated/,$(obj))
  46header-files  := $(notdir $(wildcard $(srcdir)/*.h))
  47header-files  += $(notdir $(wildcard $(srcdir)/*.agh))
  48header-files  := $(filter-out $(no-export-headers), $(header-files))
  49genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))
  50genhdr-files  := $(filter-out $(header-files), $(genhdr-files))
  51
  52# files used to track state of install/check
  53install-file  := $(installdir)/.install
  54check-file    := $(installdir)/.check
  55
  56# all headers files for this dir
  57all-files     := $(header-files) $(genhdr-files)
  58output-files  := $(addprefix $(installdir)/, $(all-files))
  59
  60ifneq ($(mandatory-y),)
  61missing       := $(filter-out $(all-files),$(mandatory-y))
  62ifneq ($(missing),)
  63$(error Some mandatory headers ($(missing)) are missing in $(obj))
  64endif
  65endif
  66
  67# Work out what needs to be removed
  68oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
  69unwanted      := $(filter-out $(all-files),$(oldheaders))
  70
  71# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
  72unwanted-file := $(addprefix $(installdir)/, $(unwanted))
  73
  74printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
  75
  76quiet_cmd_install = INSTALL $(printdir) ($(words $(all-files))\
  77                            file$(if $(word 2, $(all-files)),s))
  78      cmd_install = \
  79        $(CONFIG_SHELL) $< $(installdir) $(srcdir) $(header-files); \
  80        $(CONFIG_SHELL) $< $(installdir) $(gendir) $(genhdr-files); \
  81        touch $@
  82
  83quiet_cmd_remove = REMOVE  $(unwanted)
  84      cmd_remove = rm -f $(unwanted-file)
  85
  86quiet_cmd_check = CHECK   $(printdir) ($(words $(all-files)) files)
  87# Headers list can be pretty long, xargs helps to avoid
  88# the "Argument list too long" error.
  89      cmd_check = for f in $(all-files); do                          \
  90                  echo "$(installdir)/$${f}"; done                      \
  91                  | xargs                                            \
  92                  $(PERL) $< $(INSTALL_HDR_PATH)/include $(SRCARCH); \
  93                  touch $@
  94
  95ifndef HDRCHECK
  96# Rules for installing headers
  97__headers: $(install-file)
  98        @:
  99
 100targets += $(install-file)
 101$(install-file): scripts/headers_install.sh \
 102                 $(addprefix $(srcdir)/,$(header-files)) \
 103                 $(addprefix $(gendir)/,$(genhdr-files)) FORCE
 104        $(if $(unwanted),$(call cmd,remove),)
 105        $(if $(wildcard $(dir $@)),,$(shell mkdir -p $(dir $@)))
 106        $(call if_changed,install)
 107
 108else
 109__headers: $(check-file)
 110        @:
 111
 112targets += $(check-file)
 113$(check-file): scripts/headers_check.pl $(output-files) FORCE
 114        $(call if_changed,check)
 115
 116endif
 117
 118cmd_files := $(wildcard \
 119             $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
 120
 121ifneq ($(cmd_files),)
 122        include $(cmd_files)
 123endif
 124
 125endif # skip-inst
 126
 127PHONY += FORCE
 128FORCE: ;
 129
 130.PHONY: $(PHONY)
 131