Makefile.headersinst 2.9 KB

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  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. PHONY := __headers
  12. __headers:
  13. include scripts/Kbuild.include
  14. src := $(srctree)/$(obj)
  15. gen := $(objtree)/$(subst include/,include/generated/,$(obj))
  16. dst := usr/include
  17. -include $(src)/Kbuild
  18. # $(filter %/, ...) is a workaround for GNU Make <= 4.2.1, where
  19. # $(wildcard $(src)/*/) contains not only directories but also regular files.
  20. src-subdirs := $(patsubst $(src)/%/,%,$(filter %/, $(wildcard $(src)/*/)))
  21. gen-subdirs := $(patsubst $(gen)/%/,%,$(filter %/, $(wildcard $(gen)/*/)))
  22. all-subdirs := $(sort $(src-subdirs) $(gen-subdirs))
  23. src-headers := $(if $(src-subdirs), $(shell cd $(src) && find $(src-subdirs) -name '*.h'))
  24. src-headers := $(filter-out $(no-export-headers), $(src-headers))
  25. gen-headers := $(if $(gen-subdirs), $(shell cd $(gen) && find $(gen-subdirs) -name '*.h'))
  26. gen-headers := $(filter-out $(no-export-headers), $(gen-headers))
  27. # If the same header is exported from source and generated directories,
  28. # the former takes precedence, but this should be warned.
  29. duplicated := $(filter $(gen-headers), $(src-headers))
  30. $(if $(duplicated), $(warning duplicated header export: $(duplicated)))
  31. gen-headers := $(filter-out $(duplicated), $(gen-headers))
  32. # Add dst path prefix
  33. all-subdirs := $(addprefix $(dst)/, $(all-subdirs))
  34. src-headers := $(addprefix $(dst)/, $(src-headers))
  35. gen-headers := $(addprefix $(dst)/, $(gen-headers))
  36. all-headers := $(src-headers) $(gen-headers)
  37. # Work out what needs to be removed
  38. old-subdirs := $(wildcard $(all-subdirs))
  39. old-headers := $(if $(old-subdirs),$(shell find $(old-subdirs) -name '*.h'))
  40. unwanted := $(filter-out $(all-headers), $(old-headers))
  41. # Create directories
  42. existing-dirs := $(sort $(dir $(old-headers)))
  43. wanted-dirs := $(sort $(dir $(all-headers)))
  44. new-dirs := $(filter-out $(existing-dirs), $(wanted-dirs))
  45. $(if $(new-dirs), $(shell mkdir -p $(new-dirs)))
  46. # Rules
  47. quiet_cmd_install = HDRINST $@
  48. cmd_install = $(CONFIG_SHELL) $(srctree)/scripts/headers_install.sh $< $@
  49. $(src-headers): $(dst)/%.h: $(src)/%.h $(srctree)/scripts/headers_install.sh FORCE
  50. $(call if_changed,install)
  51. $(gen-headers): $(dst)/%.h: $(gen)/%.h $(srctree)/scripts/headers_install.sh FORCE
  52. $(call if_changed,install)
  53. quiet_cmd_remove = REMOVE $(unwanted)
  54. cmd_remove = rm -f $(unwanted)
  55. __headers: $(all-headers)
  56. ifneq ($(unwanted),)
  57. $(call cmd,remove)
  58. endif
  59. @:
  60. existing-headers := $(filter $(old-headers), $(all-headers))
  61. -include $(foreach f,$(existing-headers),$(dir $(f)).$(notdir $(f)).cmd)
  62. PHONY += FORCE
  63. FORCE:
  64. .PHONY: $(PHONY)