source: drbl_ui/backup/test_busybox/busybox-1.7.2/scripts/Makefile.clean @ 158

# ==========================================================================
# Cleaning up
# ==========================================================================

src := $(obj)

PHONY := __clean
__clean:

# Shorthand for $(Q)$(MAKE) scripts/Makefile.clean obj=dir
# Usage:
# $(Q)$(MAKE) $(clean)=dir
clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj

# The filename Kbuild has precedence over Makefile
kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile)

# Figure out what we need to build from the various variables
# ==========================================================================

__subdir-y  := $(patsubst %/,%,$(filter %/, $(obj-y)))
subdir-y  += $(__subdir-y)
__subdir-m  := $(patsubst %/,%,$(filter %/, $(obj-m)))
subdir-m  += $(__subdir-m)
__subdir-n  := $(patsubst %/,%,$(filter %/, $(obj-n)))
subdir-n  += $(__subdir-n)
__subdir- := $(patsubst %/,%,$(filter %/, $(obj-)))
subdir-   += $(__subdir-)

# Subdirectories we need to descend into

subdir-ym := $(sort $(subdir-y) $(subdir-m))
subdir-ymn      := $(sort $(subdir-ym) $(subdir-n) $(subdir-))

# Add subdir path

subdir-ymn  := $(addprefix $(obj)/,$(subdir-ymn))

# build a list of files to remove, usually releative to the current
# directory

__clean-files := $(extra-y) $(EXTRA_TARGETS) $(always) \
       $(targets) $(clean-files)             \
       $(host-progs)                         \
       $(hostprogs-y) $(hostprogs-m) $(hostprogs-)

# as clean-files is given relative to the current directory, this adds
# a $(obj) prefix, except for absolute paths

__clean-files   := $(wildcard                                               \
                   $(addprefix $(obj)/, $(filter-out /%, $(__clean-files))) \
       $(filter /%, $(__clean-files)))

# as clean-dirs is given relative to the current directory, this adds
# a $(obj) prefix, except for absolute paths

__clean-dirs    := $(wildcard                                               \
                   $(addprefix $(obj)/, $(filter-out /%, $(clean-dirs)))    \
       $(filter /%, $(clean-dirs)))

# ==========================================================================

quiet_cmd_clean    = CLEAN   $(obj)
      cmd_clean    = rm -f $(__clean-files)
quiet_cmd_cleandir = CLEAN   $(__clean-dirs)
      cmd_cleandir = rm -rf $(__clean-dirs)


__clean: $(subdir-ymn)
ifneq ($(strip $(__clean-files)),)
  +$(call cmd,clean)
endif
ifneq ($(strip $(__clean-dirs)),)
  +$(call cmd,cleandir)
endif
ifneq ($(strip $(clean-rule)),)
  +$(clean-rule)
endif
  @:


# ===========================================================================
# Generic stuff
# ===========================================================================

# Descending
# ---------------------------------------------------------------------------

PHONY += $(subdir-ymn)
$(subdir-ymn):
  $(Q)$(MAKE) $(clean)=$@

# If quiet is set, only print short version of command

cmd = @$(if $($(quiet)cmd_$(1)),echo '  $($(quiet)cmd_$(1))' &&) $(cmd_$(1))


# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)