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)