# SPDX-License-Identifier: GPL-2.0

  # ==========================================================================
  # 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))

  host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
  host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-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)))

  # Object (.o) files used by the shared libaries
  host-cshobjs	:= $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
  host-cxxshobjs	:= $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))

  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-cshlib	:= $(addprefix $(obj)/,$(host-cshlib))
  host-cxxshlib	:= $(addprefix $(obj)/,$(host-cxxshlib))
  host-cshobjs	:= $(addprefix $(obj)/,$(host-cshobjs))
  host-cxxshobjs	:= $(addprefix $(obj)/,$(host-cxxshobjs))

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

  _hostc_flags   = $(KBUILD_HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \

                   $(HOSTCFLAGS_$(basetarget).o)

  _hostcxx_flags = $(KBUILD_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) $(KBUILD_HOSTLDFLAGS) -o $@ $< \

  		$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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) $(KBUILD_HOSTLDFLAGS) -o $@ \

  			  $(addprefix $(obj)/,$($(@F)-objs)) \

  			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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) $(KBUILD_HOSTLDFLAGS) -o $@ \

  			  $(foreach o,objs cxxobjs,\
  			  $(addprefix $(obj)/,$($(@F)-$(o)))) \

  			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@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)

  # Compile .c file, create position independent .o file
  # host-cshobjs -> .o
  quiet_cmd_host-cshobjs	= HOSTCC  -fPIC $@
        cmd_host-cshobjs	= $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
  $(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
  	$(call if_changed_dep,host-cshobjs)
  
  # Compile .c file, create position independent .o file
  # Note that plugin capable gcc versions can be either C or C++ based
  # therefore plugin source files have to be compilable in both C and C++ mode.
  # This is why a C++ compiler is invoked on a .c file.
  # host-cxxshobjs -> .o
  quiet_cmd_host-cxxshobjs	= HOSTCXX -fPIC $@
        cmd_host-cxxshobjs	= $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
  $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
  	$(call if_changed_dep,host-cxxshobjs)
  
  # Link a shared library, based on position independent .o files
  # *.o -> .so shared library (host-cshlib)
  quiet_cmd_host-cshlib	= HOSTLLD -shared $@

        cmd_host-cshlib	= $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \

  			  $(addprefix $(obj)/,$($(@F:.so=-objs))) \

  			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))

  $(host-cshlib): FORCE
  	$(call if_changed,host-cshlib)
  $(call multi_depend, $(host-cshlib), .so, -objs)
  
  # Link a shared library, based on position independent .o files
  # *.o -> .so shared library (host-cxxshlib)
  quiet_cmd_host-cxxshlib	= HOSTLLD -shared $@

        cmd_host-cxxshlib	= $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \

  			  $(addprefix $(obj)/,$($(@F:.so=-objs))) \

  			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))

  $(host-cxxshlib): FORCE
  	$(call if_changed,host-cxxshlib)
  $(call multi_depend, $(host-cxxshlib), .so, -objs)

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

  	   $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)