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++ 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 # SPDX-License-Identifier:      GPL-2.0
  24 #
  25
  26 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
  27
  28 # C code
  29 # Executables compiled from a single .c file
  30 host-csingle    := $(foreach m,$(__hostprogs), \
  31                         $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
  32
  33 # C executables linked based on several .o files
  34 host-cmulti     := $(foreach m,$(__hostprogs),\
  35                    $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  36
  37 # Object (.o) files compiled from .c files
  38 host-cobjs      := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
  39
  40 # C++ code
  41 # C++ executables compiled from at least one .cc file
  42 # and zero or more .c files
  43 host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  44
  45 # C++ Object (.o) files compiled from .cc files
  46 host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  47
  48 # output directory for programs/.o files
  49 # hostprogs-y := tools/build may have been specified.
  50 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
  51 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
  52
  53 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
  54
  55
  56 __hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  57 host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  58 host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  59 host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  60 host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  61 host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  62 host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
  63
  64 obj-dirs += $(host-objdirs)
  65
  66 #####
  67 # Handle options to gcc. Support building with separate output directory
  68
  69 _hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
  70                  $(HOSTCFLAGS_$(basetarget).o)
  71 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
  72                  $(HOSTCXXFLAGS_$(basetarget).o)
  73
  74 ifeq ($(KBUILD_SRC),)
  75 __hostc_flags   = $(_hostc_flags)
  76 __hostcxx_flags = $(_hostcxx_flags)
  77 else
  78 __hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  79 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  80 endif
  81
  82 hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  83 hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  84
  85 #####
  86 # Compile programs on the host
  87
  88 # Create executable from a single .c file
  89 # host-csingle -> Executable
  90 quiet_cmd_host-csingle  = HOSTCC  $@
  91       cmd_host-csingle  = $(HOSTCC) $(hostc_flags) -o $@ $< \
  92                 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
  93 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
  94         $(call if_changed_dep,host-csingle)
  95
  96 # Link an executable based on list of .o files, all plain c
  97 # host-cmulti -> executable
  98 quiet_cmd_host-cmulti   = HOSTLD  $@
  99       cmd_host-cmulti   = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
 100                           $(addprefix $(obj)/,$($(@F)-objs)) \
 101                           $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 102 $(host-cmulti): FORCE
 103         $(call if_changed,host-cmulti)
 104 $(call multi_depend, $(host-cmulti), , -objs)
 105
 106 # Create .o file from a single .c file
 107 # host-cobjs -> .o
 108 quiet_cmd_host-cobjs    = HOSTCC  $@
 109       cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 110 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 111         $(call if_changed_dep,host-cobjs)
 112
 113 # Link an executable based on list of .o files, a mixture of .c and .cc
 114 # host-cxxmulti -> executable
 115 quiet_cmd_host-cxxmulti = HOSTLD  $@
 116       cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
 117                           $(foreach o,objs cxxobjs,\
 118                           $(addprefix $(obj)/,$($(@F)-$(o)))) \
 119                           $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 120 $(host-cxxmulti): FORCE
 121         $(call if_changed,host-cxxmulti)
 122 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
 123
 124 # Create .o file from a single .cc (C++) file
 125 quiet_cmd_host-cxxobjs  = HOSTCXX $@
 126       cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 127 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 128         $(call if_changed_dep,host-cxxobjs)
 129
 130 targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 131            $(host-cxxmulti) $(host-cxxobjs)