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
  36 obj-dirs += $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))
  37 obj-dirs := $(strip $(sort $(filter-out ./,$(obj-dirs))))
  38
  39
  40 # C code
  41 # Executables compiled from a single .c file
  42 host-csingle    := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))
  43
  44 # C executables linked based on several .o files
  45 host-cmulti     := $(foreach m,$(__hostprogs),\
  46                    $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  47
  48 # Object (.o) files compiled from .c files
  49 host-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
  54 host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  55
  56 # C++ Object (.o) files compiled from .cc files
  57 host-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"
  61 host-cshlib     := $(sort $(filter %.so, $(host-cobjs)))
  62 # Remove .so files from "xxx-objs"
  63 host-cobjs      := $(filter-out %.so,$(host-cobjs))
  64
  65 #Object (.o) files used by the shared libaries
  66 host-cshobjs    := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
  67
  68 __hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  69 host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  70 host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  71 host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  72 host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  73 host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  74 host-cshlib     := $(addprefix $(obj)/,$(host-cshlib))
  75 host-cshobjs    := $(addprefix $(obj)/,$(host-cshobjs))
  76 obj-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
  84 ifeq ($(KBUILD_SRC),)
  85 __hostc_flags   = $(_hostc_flags)
  86 __hostcxx_flags = $(_hostcxx_flags)
  87 else
  88 __hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  89 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  90 endif
  91
  92 hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  93 hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  94
  95 #####
  96 # Compile programs on the host
  97
  98 # Create executable from a single .c file
  99 # host-csingle -> Executable
 100 quiet_cmd_host-csingle  = HOSTCC  $@
 101       cmd_host-csingle  = $(HOSTCC) $(hostc_flags) $(HOST_LOADLIBES) -o $@ $<
 102 $(host-csingle): %: %.c FORCE
 103         $(call if_changed_dep,host-csingle)
 104
 105 # Link an executable based on list of .o files, all plain c
 106 # host-cmulti -> executable
 107 quiet_cmd_host-cmulti   = HOSTLD  $@
 108       cmd_host-cmulti   = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
 109                           $(addprefix $(obj)/,$($(@F)-objs)) \
 110                           $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 111 $(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE
 112         $(call if_changed,host-cmulti)
 113
 114 # Create .o file from a single .c file
 115 # host-cobjs -> .o
 116 quiet_cmd_host-cobjs    = HOSTCC  $@
 117       cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 118 $(host-cobjs): %.o: %.c FORCE
 119         $(call if_changed_dep,host-cobjs)
 120
 121 # Link an executable based on list of .o files, a mixture of .c and .cc
 122 # host-cxxmulti -> executable
 123 quiet_cmd_host-cxxmulti = HOSTLD  $@
 124       cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
 125                           $(foreach o,objs cxxobjs,\
 126                           $(addprefix $(obj)/,$($(@F)-$(o)))) \
 127                           $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 128 $(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE
 129         $(call if_changed,host-cxxmulti)
 130
 131 # Create .o file from a single .cc (C++) file
 132 quiet_cmd_host-cxxobjs  = HOSTCXX $@
 133       cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 134 $(host-cxxobjs): %.o: %.cc FORCE
 135         $(call if_changed_dep,host-cxxobjs)
 136
 137 # Compile .c file, create position independent .o file
 138 # host-cshobjs -> .o
 139 quiet_cmd_host-cshobjs  = HOSTCC  -fPIC $@
 140       cmd_host-cshobjs  = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
 141 $(host-cshobjs): %.o: %.c FORCE
 142         $(call if_changed_dep,host-cshobjs)
 143
 144 # Link a shared library, based on position independent .o files
 145 # *.o -> .so shared library (host-cshlib)
 146 quiet_cmd_host-cshlib   = HOSTLLD -shared $@
 147       cmd_host-cshlib   = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
 148                           $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 149                           $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 150 $(host-cshlib): %: $(host-cshobjs) FORCE
 151         $(call if_changed,host-cshlib)
 152
 153 targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 154            $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)
 155