# ==========================================================================
  # Building binaries on the host system
  # Binaries are used during the compilation of the kernel, for example
  # to preprocess a data file.
  #

  # Both C and C++ are supported, but preferred language is C for such utilities.

  #

  # Sample syntax (see Documentation/kbuild/makefiles.txt for reference)

  # hostprogs-y := bin2hex
  # Will compile bin2hex.c and create an executable named bin2hex
  #
  # hostprogs-y    := lxdialog
  # lxdialog-objs := checklist.o lxdialog.o
  # Will compile lxdialog.c and checklist.c, and then link the executable
  # lxdialog, based on checklist.o and lxdialog.o
  #
  # hostprogs-y      := qconf
  # qconf-cxxobjs   := qconf.o
  # qconf-objs      := menu.o
  # Will compile qconf as a C++ program, and menu as a C program.
  # They are linked as C++ code to the executable qconf

  __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))

  # C code
  # Executables compiled from a single .c file

  host-csingle	:= $(foreach m,$(__hostprogs), \
  			$(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))

  
  # C executables linked based on several .o files
  host-cmulti	:= $(foreach m,$(__hostprogs),\
  		   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  
  # Object (.o) files compiled from .c files
  host-cobjs	:= $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
  
  # C++ code

  # C++ executables compiled from at least one .cc file

  # and zero or more .c files
  host-cxxmulti	:= $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  
  # C++ Object (.o) files compiled from .cc files
  host-cxxobjs	:= $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))

  # output directory for programs/.o files

  # hostprogs-y := tools/build may have been specified.
  # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
  host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))

  
  host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))

  __hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  host-csingle	:= $(addprefix $(obj)/,$(host-csingle))
  host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))
  host-cobjs	:= $(addprefix $(obj)/,$(host-cobjs))
  host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))
  host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))

  host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
  
  obj-dirs += $(host-objdirs)

  
  #####
  # Handle options to gcc. Support building with separate output directory

  _hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
                   $(HOSTCFLAGS_$(basetarget).o)
  _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
                   $(HOSTCXXFLAGS_$(basetarget).o)

  
  ifeq ($(KBUILD_SRC),)
  __hostc_flags	= $(_hostc_flags)
  __hostcxx_flags	= $(_hostcxx_flags)
  else
  __hostc_flags	= -I$(obj) $(call flags,_hostc_flags)
  __hostcxx_flags	= -I$(obj) $(call flags,_hostcxx_flags)
  endif
  
  hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  
  #####
  # Compile programs on the host
  
  # Create executable from a single .c file
  # host-csingle -> Executable
  quiet_cmd_host-csingle 	= HOSTCC  $@

        cmd_host-csingle	= $(HOSTCC) $(hostc_flags) -o $@ $< \
  	  	$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))

  $(host-csingle): $(obj)/%: $(src)/%.c FORCE

  	$(call if_changed_dep,host-csingle)
  
  # Link an executable based on list of .o files, all plain c
  # host-cmulti -> executable
  quiet_cmd_host-cmulti	= HOSTLD  $@
        cmd_host-cmulti	= $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
  			  $(addprefix $(obj)/,$($(@F)-objs)) \
  			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))

  $(host-cmulti): FORCE

  	$(call if_changed,host-cmulti)

  $(call multi_depend, $(host-cmulti), , -objs)

  
  # Create .o file from a single .c file
  # host-cobjs -> .o
  quiet_cmd_host-cobjs	= HOSTCC  $@
        cmd_host-cobjs	= $(HOSTCC) $(hostc_flags) -c -o $@ $<

  $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE

  	$(call if_changed_dep,host-cobjs)
  
  # Link an executable based on list of .o files, a mixture of .c and .cc
  # host-cxxmulti -> executable
  quiet_cmd_host-cxxmulti	= HOSTLD  $@
        cmd_host-cxxmulti	= $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
  			  $(foreach o,objs cxxobjs,\
  			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
  			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))

  $(host-cxxmulti): FORCE

  	$(call if_changed,host-cxxmulti)

  $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)

  
  # Create .o file from a single .cc (C++) file
  quiet_cmd_host-cxxobjs	= HOSTCXX $@
        cmd_host-cxxobjs	= $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<

  $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE

  	$(call if_changed_dep,host-cxxobjs)

  targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\

  	   $(host-cxxmulti) $(host-cxxobjs)