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  := $(filter-out $(no-export-headers), $(header-files))
  48genhdr-files  := $(notdir $(wildcard $(gendir)/*.h))
  49genhdr-files  := $(filter-out $(header-files), $(genhdr-files))
  50
  51# files used to track state of install/check
  52install-file  := $(installdir)/.install
  53check-file    := $(installdir)/.check
  54
  55# all headers files for this dir
  56all-files     := $(header-files) $(genhdr-files)
  57output-files  := $(addprefix $(installdir)/, $(all-files))
  58
  59# Work out what needs to be removed
  60oldheaders    := $(patsubst $(installdir)/%,%,$(wildcard $(installdir)/*.h))
  61unwanted      := $(filter-out $(all-files),$(oldheaders))
  62
  63# Prefix unwanted with full paths to $(INSTALL_HDR_PATH)
  64unwanted-file := $(addprefix $(installdir)/, $(unwanted))
  65
  66printdir = $(patsubst $(INSTALL_HDR_PATH)/%/,%,$(dir $@))
  67
  68quiet_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
  75quiet_cmd_remove = REMOVE  $(unwanted)
  76      cmd_remove = rm -f $(unwanted-file)
  77
  78quiet_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
  87ifndef HDRCHECK
  88# Rules for installing headers
  89__headers: $(install-file)
  90        @:
  91
  92targets += $(install-file)
  93$(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
 100else
 101__headers: $(check-file)
 102        @:
 103
 104targets += $(check-file)
 105$(check-file): scripts/headers_check.pl $(output-files) FORCE
 106        $(call if_changed,check)
 107
 108endif
 109
 110cmd_files := $(wildcard \
 111             $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
 112
 113ifneq ($(cmd_files),)
 114        include $(cmd_files)
 115endif
 116
 117endif # skip-inst
 118
 119PHONY += FORCE
 120FORCE: ;
 121
 122.PHONY: $(PHONY)
 123