linux/scripts/Makefile.host
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   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
  27host-csingle    := $(foreach m,$(__hostprogs), \
  28                        $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
  29
  30# C executables linked based on several .o files
  31host-cmulti     := $(foreach m,$(__hostprogs),\
  32                   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  33
  34# Object (.o) files compiled from .c files
  35host-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
  40host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  41
  42# C++ Object (.o) files compiled from .cc files
  43host-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
  48host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
  49
  50host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
  51
  52
  53__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  54host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  55host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  56host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  57host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  58host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  59host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
  60
  61obj-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
  71ifeq ($(KBUILD_SRC),)
  72__hostc_flags   = $(_hostc_flags)
  73__hostcxx_flags = $(_hostcxx_flags)
  74else
  75__hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  76__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  77endif
  78
  79hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  80hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  81
  82#####
  83# Compile programs on the host
  84
  85# Create executable from a single .c file
  86# host-csingle -> Executable
  87quiet_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
  95quiet_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
 105quiet_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
 112quiet_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
 122quiet_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
 127targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 128           $(host-cxxmulti) $(host-cxxobjs)
 129