scripts/Makefile.host

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