LXR busybox/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++ is supported, but preferred language is C for such utilities.
   7#
   8# Samle syntax (see Documentation/kbuild/makefile.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 consist of
  27# expr.o and type.o (they are both compiled as C code and the object file
  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# hostprogs-y := tools/build may have been specified. Retreive directory
  36obj-dirs += $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
  37obj-dirs := $(strip $(sort $(filter-out ./,$(obj-dirs))))
  38
  39
  40# C code
  41# Executables compiled from a single .c file
  42host-csingle    := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
  43
  44# C executables linked based on several .o files
  45host-cmulti     := $(foreach m,$(__hostprogs),\
  46                   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  47
  48# Object (.o) files compiled from .c files
  49host-cobjs      := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
  50
  51# C++ code
  52# C++ executables compiled from at least on .cc file
  53# and zero or more .c files
  54host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  55
  56# C++ Object (.o) files compiled from .cc files
  57host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  58
  59# Shared libaries (only .c supported)
  60# Shared libraries (.so) - all .so files referenced in "xxx-objs"
  61host-cshlib     := $(sort $(filter %.so, $(host-cobjs)))
  62# Remove .so files from "xxx-objs"
  63host-cobjs      := $(filter-out %.so,$(host-cobjs))
  64
  65#Object (.o) files used by the shared libaries
  66host-cshobjs    := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
  67
  68__hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  69host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  70host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  71host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  72host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  73host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  74host-cshlib     := $(addprefix $(obj)/,$(host-cshlib))
  75host-cshobjs    := $(addprefix $(obj)/,$(host-cshobjs))
  76obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
  77
  78#####
  79# Handle options to gcc. Support building with separate output directory
  80
  81_hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   $(HOSTCFLAGS_$(*F).o)
  82_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) $(HOSTCXXFLAGS_$(*F).o)
  83
  84ifeq ($(KBUILD_SRC),)
  85__hostc_flags   = $(_hostc_flags)
  86__hostcxx_flags = $(_hostcxx_flags)
  87else
  88__hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  89__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  90endif
  91
  92hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  93hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  94
  95#####
  96# Compile programs on the host
  97
  98# Create executable from a single .c file
  99# host-csingle -> Executable
 100quiet_cmd_host-csingle  = HOSTCC  $@
 101      cmd_host-csingle  = $(HOSTCC) $(hostc_flags) -o $@ $< \
 102                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 103$(host-csingle): %: %.c FORCE
 104        $(call if_changed_dep,host-csingle)
 105
 106# Link an executable based on list of .o files, all plain c
 107# host-cmulti -> executable
 108quiet_cmd_host-cmulti   = HOSTLD  $@
 109      cmd_host-cmulti   = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
 110                          $(addprefix $(obj)/,$($(@F)-objs)) \
 111                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 112$(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE
 113        $(call if_changed,host-cmulti)
 114
 115# Create .o file from a single .c file
 116# host-cobjs -> .o
 117quiet_cmd_host-cobjs    = HOSTCC  $@
 118      cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 119$(host-cobjs): %.o: %.c FORCE
 120        $(call if_changed_dep,host-cobjs)
 121
 122# Link an executable based on list of .o files, a mixture of .c and .cc
 123# host-cxxmulti -> executable
 124quiet_cmd_host-cxxmulti = HOSTLD  $@
 125      cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
 126                          $(foreach o,objs cxxobjs,\
 127                          $(addprefix $(obj)/,$($(@F)-$(o)))) \
 128                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 129$(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
 130        $(call if_changed,host-cxxmulti)
 131
 132# Create .o file from a single .cc (C++) file
 133quiet_cmd_host-cxxobjs  = HOSTCXX $@
 134      cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 135$(host-cxxobjs): %.o: %.cc FORCE
 136        $(call if_changed_dep,host-cxxobjs)
 137
 138# Compile .c file, create position independent .o file
 139# host-cshobjs -> .o
 140quiet_cmd_host-cshobjs  = HOSTCC  -fPIC $@
 141      cmd_host-cshobjs  = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
 142$(host-cshobjs): %.o: %.c FORCE
 143        $(call if_changed_dep,host-cshobjs)
 144
 145# Link a shared library, based on position independent .o files
 146# *.o -> .so shared library (host-cshlib)
 147quiet_cmd_host-cshlib   = HOSTLLD -shared $@
 148      cmd_host-cshlib   = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
 149                          $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 150                          $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 151$(host-cshlib): %: $(host-cshobjs) FORCE
 152        $(call if_changed,host-cshlib)
 153
 154targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 155           $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)
 156