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-y := conf
  24# conf-objs  := conf.o libkconfig.so
  25# libkconfig-objs := expr.o type.o
  26# Will create a shared library named libkconfig.so that consists of
  27# expr.o and type.o (they are both compiled as C code and the object files
  28# are made as position independent code).
  29# conf.c is compiled as a C program, and conf.o is linked together with
  30# libkconfig.so as the executable conf.
  31# Note: Shared libraries consisting of C++ files are not supported
  32
  33__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
  34
  35# C code
  36# Executables compiled from a single .c file
  37host-csingle    := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
  38
  39# C executables linked based on several .o files
  40host-cmulti     := $(foreach m,$(__hostprogs),\
  41                   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  42
  43# Object (.o) files compiled from .c files
  44host-cobjs      := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
  45
  46# C++ code
  47# C++ executables compiled from at least on .cc file
  48# and zero or more .c files
  49host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  50
  51# C++ Object (.o) files compiled from .cc files
  52host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  53
  54# Shared libaries (only .c supported)
  55# Shared libraries (.so) - all .so files referenced in "xxx-objs"
  56host-cshlib     := $(sort $(filter %.so, $(host-cobjs)))
  57# Remove .so files from "xxx-objs"
  58host-cobjs      := $(filter-out %.so,$(host-cobjs))
  59
  60#Object (.o) files used by the shared libaries
  61host-cshobjs    := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
  62
  63# output directory for programs/.o files
  64# hostprogs-y := tools/build may have been specified. Retrieve directory
  65host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
  66# directory of .o files from prog-objs notation
  67host-objdirs += $(foreach f,$(host-cmulti),                  \
  68                    $(foreach m,$($(f)-objs),                \
  69                        $(if $(dir $(m)),$(dir $(m)))))
  70# directory of .o files from prog-cxxobjs notation
  71host-objdirs += $(foreach f,$(host-cxxmulti),                  \
  72                    $(foreach m,$($(f)-cxxobjs),                \
  73                        $(if $(dir $(m)),$(dir $(m)))))
  74
  75host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
  76
  77
  78__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  79host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  80host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  81host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  82host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  83host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  84host-cshlib     := $(addprefix $(obj)/,$(host-cshlib))
  85host-cshobjs    := $(addprefix $(obj)/,$(host-cshobjs))
  86host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
  87
  88obj-dirs += $(host-objdirs)
  89
  90#####
  91# Handle options to gcc. Support building with separate output directory
  92
  93_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
  94                 $(HOSTCFLAGS_$(basetarget).o)
  95_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
  96                 $(HOSTCXXFLAGS_$(basetarget).o)
  97
  98ifeq ($(KBUILD_SRC),)
  99__hostc_flags   = $(_hostc_flags)
 100__hostcxx_flags = $(_hostcxx_flags)
 101else
 102__hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
 103__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
 104endif
 105
 106hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
 107hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
 108
 109#####
 110# Compile programs on the host
 111
 112# Create executable from a single .c file
 113# host-csingle -> Executable
 114quiet_cmd_host-csingle  = HOSTCC  $@
 115      cmd_host-csingle  = $(HOSTCC) $(hostc_flags) -o $@ $< \
 116                $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 117$(host-csingle): $(obj)/%: $(src)/%.c FORCE
 118        $(call if_changed_dep,host-csingle)
 119
 120# Link an executable based on list of .o files, all plain c
 121# host-cmulti -> executable
 122quiet_cmd_host-cmulti   = HOSTLD  $@
 123      cmd_host-cmulti   = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
 124                          $(addprefix $(obj)/,$($(@F)-objs)) \
 125                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 126$(host-cmulti): $(obj)/%: $(host-cobjs) $(host-cshlib) FORCE
 127        $(call if_changed,host-cmulti)
 128
 129# Create .o file from a single .c file
 130# host-cobjs -> .o
 131quiet_cmd_host-cobjs    = HOSTCC  $@
 132      cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 133$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 134        $(call if_changed_dep,host-cobjs)
 135
 136# Link an executable based on list of .o files, a mixture of .c and .cc
 137# host-cxxmulti -> executable
 138quiet_cmd_host-cxxmulti = HOSTLD  $@
 139      cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
 140                          $(foreach o,objs cxxobjs,\
 141                          $(addprefix $(obj)/,$($(@F)-$(o)))) \
 142                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 143$(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
 144        $(call if_changed,host-cxxmulti)
 145
 146# Create .o file from a single .cc (C++) file
 147quiet_cmd_host-cxxobjs  = HOSTCXX $@
 148      cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 149$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 150        $(call if_changed_dep,host-cxxobjs)
 151
 152# Compile .c file, create position independent .o file
 153# host-cshobjs -> .o
 154quiet_cmd_host-cshobjs  = HOSTCC  -fPIC $@
 155      cmd_host-cshobjs  = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
 156$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
 157        $(call if_changed_dep,host-cshobjs)
 158
 159# Link a shared library, based on position independent .o files
 160# *.o -> .so shared library (host-cshlib)
 161quiet_cmd_host-cshlib   = HOSTLLD -shared $@
 162      cmd_host-cshlib   = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
 163                          $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 164                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 165$(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE
 166        $(call if_changed,host-cshlib)
 167
 168targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 169           $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) 
 170
 171
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