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      1 # SPDX-License-Identifier: GPL-2.0
      2 # ==========================================================================
      3 # Building binaries on the host system
      4 # Binaries are used during the compilation of the kernel, for example
      5 # to preprocess a data file.
      6 #
      7 # Both C and C++ are supported, but preferred language is C for such utilities.
      8 #
      9 # Sample syntax (see Documentation/kbuild/makefiles.txt for reference)
     10 # hostprogs-y := bin2hex
     11 # Will compile bin2hex.c and create an executable named bin2hex
     12 #
     13 # hostprogs-y    := lxdialog
     14 # lxdialog-objs := checklist.o lxdialog.o
     15 # Will compile lxdialog.c and checklist.c, and then link the executable
     16 # lxdialog, based on checklist.o and lxdialog.o
     17 #
     18 # hostprogs-y      := qconf
     19 # qconf-cxxobjs   := qconf.o
     20 # qconf-objs      := menu.o
     21 # Will compile qconf as a C++ program, and menu as a C program.
     22 # They are linked as C++ code to the executable qconf
     23 
     24 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
     25 
     26 # C code
     27 # Executables compiled from a single .c file
     28 host-csingle	:= $(foreach m,$(__hostprogs), \
     29 			$(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-sharedobjs),,$(m)))
     30 
     31 # C executables linked based on several .o files
     32 host-cmulti	:= $(foreach m,$(__hostprogs),\
     33 		   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
     34 
     35 # Shared object libraries
     36 host-shared	:= $(foreach m,$(__hostprogs),\
     37 		   $(if $($(m)-sharedobjs),$(m))))
     38 
     39 # Object (.o) files compiled from .c files
     40 host-cobjs	:= $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
     41 
     42 # C++ code
     43 # C++ executables compiled from at least one .cc file
     44 # and zero or more .c files
     45 host-cxxmulti	:= $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
     46 
     47 # C++ Object (.o) files compiled from .cc files
     48 host-cxxobjs	:= $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
     49 
     50 # output directory for programs/.o files
     51 # hostprogs-y := tools/build may have been specified.
     52 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
     53 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
     54 
     55 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
     56 
     57 
     58 __hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
     59 host-csingle	:= $(addprefix $(obj)/,$(host-csingle))
     60 host-cmulti	:= $(addprefix $(obj)/,$(host-cmulti))
     61 host-cobjs	:= $(addprefix $(obj)/,$(host-cobjs))
     62 host-cxxmulti	:= $(addprefix $(obj)/,$(host-cxxmulti))
     63 host-cxxobjs	:= $(addprefix $(obj)/,$(host-cxxobjs))
     64 host-shared	:= $(addprefix $(obj)/,$(host-shared))
     65 host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
     66 
     67 obj-dirs += $(host-objdirs)
     68 
     69 #####
     70 # Handle options to gcc. Support building with separate output directory
     71 
     72 _hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
     73                  $(HOSTCFLAGS_$(basetarget).o)
     74 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
     75                  $(HOSTCXXFLAGS_$(basetarget).o)
     76 
     77 ifeq ($(KBUILD_SRC),)
     78 __hostc_flags	= $(_hostc_flags)
     79 __hostcxx_flags	= $(_hostcxx_flags)
     80 else
     81 __hostc_flags	= -I$(obj) $(call flags,_hostc_flags)
     82 __hostcxx_flags	= -I$(obj) $(call flags,_hostcxx_flags)
     83 endif
     84 
     85 hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
     86 hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
     87 
     88 #####
     89 # Compile programs on the host
     90 
     91 # Create executable from a single .c file
     92 # host-csingle -> Executable
     93 quiet_cmd_host-csingle 	= HOSTCC  $@
     94       cmd_host-csingle	= $(HOSTCC) $(hostc_flags) -o $@ $< \
     95 	  	$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
     96 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
     97 	$(call if_changed_dep,host-csingle)
     98 
     99 # Link an executable based on list of .o files, all plain c
    100 # host-cmulti -> executable
    101 quiet_cmd_host-cmulti	= HOSTLD  $@
    102       cmd_host-cmulti	= $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
    103 			  $(addprefix $(obj)/,$($(@F)-objs)) \
    104 			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
    105 $(host-cmulti): FORCE
    106 	$(call if_changed,host-cmulti)
    107 $(call multi_depend, $(host-cmulti), , -objs)
    108 
    109 # Create .o file from a single .c file
    110 # host-cobjs -> .o
    111 quiet_cmd_host-cobjs	= HOSTCC  $@
    112       cmd_host-cobjs	= $(HOSTCC) $(hostc_flags) -c -o $@ $<
    113 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
    114 	$(call if_changed_dep,host-cobjs)
    115 
    116 # Link an executable based on list of .o files, a mixture of .c and .cc
    117 # host-cxxmulti -> executable
    118 quiet_cmd_host-cxxmulti	= HOSTLD  $@
    119       cmd_host-cxxmulti	= $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
    120 			  $(foreach o,objs cxxobjs,\
    121 			  $(addprefix $(obj)/,$($(@F)-$(o)))) \
    122 			  $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
    123 $(host-cxxmulti): FORCE
    124 	$(call if_changed,host-cxxmulti)
    125 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
    126 
    127 # Create .o file from a single .cc (C++) file
    128 quiet_cmd_host-cxxobjs	= HOSTCXX $@
    129       cmd_host-cxxobjs	= $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
    130 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
    131 	$(call if_changed_dep,host-cxxobjs)
    132 
    133 targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
    134 	   $(host-cxxmulti) $(host-cxxobjs) $(host-shared)
    135