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# hostcc-option
  24# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
  25
  26hostcc-option = $(call try-run,\
  27        $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
  28
  29__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
  30host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
  31host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
  32
  33# C code
  34# Executables compiled from a single .c file
  35host-csingle    := $(foreach m,$(__hostprogs), \
  36                        $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
  37
  38# C executables linked based on several .o files
  39host-cmulti     := $(foreach m,$(__hostprogs),\
  40                   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  41
  42# Object (.o) files compiled from .c files
  43host-cobjs      := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
  44
  45# C++ code
  46# C++ executables compiled from at least one .cc file
  47# and zero or more .c files
  48host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  49
  50# C++ Object (.o) files compiled from .cc files
  51host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  52
  53# Object (.o) files used by the shared libaries
  54host-cshobjs    := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
  55host-cxxshobjs  := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
  56
  57# output directory for programs/.o files
  58# hostprogs-y := tools/build may have been specified.
  59# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
  60host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
  61
  62host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
  63
  64
  65__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  66host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  67host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  68host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  69host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  70host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  71host-cshlib     := $(addprefix $(obj)/,$(host-cshlib))
  72host-cxxshlib   := $(addprefix $(obj)/,$(host-cxxshlib))
  73host-cshobjs    := $(addprefix $(obj)/,$(host-cshobjs))
  74host-cxxshobjs  := $(addprefix $(obj)/,$(host-cxxshobjs))
  75host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
  76
  77obj-dirs += $(host-objdirs)
  78
  79#####
  80# Handle options to gcc. Support building with separate output directory
  81
  82_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
  83                 $(HOSTCFLAGS_$(basetarget).o)
  84_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
  85                 $(HOSTCXXFLAGS_$(basetarget).o)
  86
  87ifeq ($(KBUILD_SRC),)
  88__hostc_flags   = $(_hostc_flags)
  89__hostcxx_flags = $(_hostcxx_flags)
  90else
  91__hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  92__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  93endif
  94
  95hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  96hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  97
  98#####
  99# Compile programs on the host
 100
 101# Create executable from a single .c file
 102# host-csingle -> Executable
 103quiet_cmd_host-csingle  = HOSTCC  $@
 104      cmd_host-csingle  = $(HOSTCC) $(hostc_flags) -o $@ $< \
 105                $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 106$(host-csingle): $(obj)/%: $(src)/%.c FORCE
 107        $(call if_changed_dep,host-csingle)
 108
 109# Link an executable based on list of .o files, all plain c
 110# host-cmulti -> executable
 111quiet_cmd_host-cmulti   = HOSTLD  $@
 112      cmd_host-cmulti   = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
 113                          $(addprefix $(obj)/,$($(@F)-objs)) \
 114                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 115$(host-cmulti): FORCE
 116        $(call if_changed,host-cmulti)
 117$(call multi_depend, $(host-cmulti), , -objs)
 118
 119# Create .o file from a single .c file
 120# host-cobjs -> .o
 121quiet_cmd_host-cobjs    = HOSTCC  $@
 122      cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 123$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 124        $(call if_changed_dep,host-cobjs)
 125
 126# Link an executable based on list of .o files, a mixture of .c and .cc
 127# host-cxxmulti -> executable
 128quiet_cmd_host-cxxmulti = HOSTLD  $@
 129      cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
 130                          $(foreach o,objs cxxobjs,\
 131                          $(addprefix $(obj)/,$($(@F)-$(o)))) \
 132                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 133$(host-cxxmulti): FORCE
 134        $(call if_changed,host-cxxmulti)
 135$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
 136
 137# Create .o file from a single .cc (C++) file
 138quiet_cmd_host-cxxobjs  = HOSTCXX $@
 139      cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 140$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 141        $(call if_changed_dep,host-cxxobjs)
 142
 143# Compile .c file, create position independent .o file
 144# host-cshobjs -> .o
 145quiet_cmd_host-cshobjs  = HOSTCC  -fPIC $@
 146      cmd_host-cshobjs  = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
 147$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
 148        $(call if_changed_dep,host-cshobjs)
 149
 150# Compile .c file, create position independent .o file
 151# Note that plugin capable gcc versions can be either C or C++ based
 152# therefore plugin source files have to be compilable in both C and C++ mode.
 153# This is why a C++ compiler is invoked on a .c file.
 154# host-cxxshobjs -> .o
 155quiet_cmd_host-cxxshobjs        = HOSTCXX -fPIC $@
 156      cmd_host-cxxshobjs        = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
 157$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
 158        $(call if_changed_dep,host-cxxshobjs)
 159
 160# Link a shared library, based on position independent .o files
 161# *.o -> .so shared library (host-cshlib)
 162quiet_cmd_host-cshlib   = HOSTLLD -shared $@
 163      cmd_host-cshlib   = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
 164                          $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 165                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 166$(host-cshlib): FORCE
 167        $(call if_changed,host-cshlib)
 168$(call multi_depend, $(host-cshlib), .so, -objs)
 169
 170# Link a shared library, based on position independent .o files
 171# *.o -> .so shared library (host-cxxshlib)
 172quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
 173      cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
 174                          $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 175                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 176$(host-cxxshlib): FORCE
 177        $(call if_changed,host-cxxshlib)
 178$(call multi_depend, $(host-cxxshlib), .so, -objs)
 179
 180targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 181           $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
 182