# SPDX-License-Identifier: GPL-2.0

  
  # LEX
  # ---------------------------------------------------------------------------
  quiet_cmd_flex = LEX     $@
        cmd_flex = $(LEX) -o$@ -L $<
  
  $(obj)/%.lex.c: $(src)/%.l FORCE
  	$(call if_changed,flex)
  
  # YACC
  # ---------------------------------------------------------------------------
  quiet_cmd_bison = YACC    $(basename $@).[ch]
        cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
  
  $(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
  	$(call if_changed,bison)

  # ==========================================================================
  # 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.rst for reference)

  # hostprogs := bin2hex

  # Will compile bin2hex.c and create an executable named bin2hex
  #

  # hostprogs     := 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       := 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

  # 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)))

  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))

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

  _hostc_flags   = $(KBUILD_HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \

                   $(HOSTCFLAGS_$(target-stem).o)

  _hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \

                   $(HOSTCXXFLAGS_$(target-stem).o)

  # $(objtree)/$(obj) for including generated headers from checkin source files

  ifeq ($(KBUILD_EXTMOD),)

  ifdef building_out_of_srctree

  _hostc_flags   += -I $(objtree)/$(obj)
  _hostcxx_flags += -I $(objtree)/$(obj)

  endif

  endif

  hostc_flags    = -Wp,-MMD,$(depfile) $(_hostc_flags)
  hostcxx_flags  = -Wp,-MMD,$(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) $(HOSTLDLIBS_$(target-stem))

  $(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)/, $($(target-stem)-objs)) \
  			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))

  $(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)/, $($(target-stem)-$(o)))) \
  			  $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))

  $(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)