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)-sharedobjs),,$(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 # Shared object libraries
  38 host-shared     := $(foreach m,$(__hostprogs),\
  39                    $(if $($(m)-sharedobjs),$(m))))
  40
  41 # Object (.o) files compiled from .c files
  42 host-cobjs      := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))
  43
  44 # C++ code
  45 # C++ executables compiled from at least one .cc file
  46 # and zero or more .c files
  47 host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  48
  49 # C++ Object (.o) files compiled from .cc files
  50 host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  51
  52 # output directory for programs/.o files
  53 # hostprogs-y := tools/build may have been specified.
  54 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
  55 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs))
  56
  57 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))
  58
  59
  60 __hostprogs     := $(addprefix $(obj)/,$(__hostprogs))
  61 host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  62 host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  63 host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  64 host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  65 host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  66 host-shared     := $(addprefix $(obj)/,$(host-shared))
  67 host-objdirs    := $(addprefix $(obj)/,$(host-objdirs))
  68
  69 obj-dirs += $(host-objdirs)
  70
  71 #####
  72 # Handle options to gcc. Support building with separate output directory
  73
  74 _hostc_flags   = $(HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
  75                  $(HOSTCFLAGS_$(basetarget).o)
  76 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
  77                  $(HOSTCXXFLAGS_$(basetarget).o)
  78
  79 ifeq ($(KBUILD_SRC),)
  80 __hostc_flags   = $(_hostc_flags)
  81 __hostcxx_flags = $(_hostcxx_flags)
  82 else
  83 __hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  84 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  85 endif
  86
  87 hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  88 hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  89
  90 #####
  91 # Compile programs on the host
  92
  93 # Create executable from a single .c file
  94 # host-csingle -> Executable
  95 quiet_cmd_host-csingle  = HOSTCC  $@
  96       cmd_host-csingle  = $(HOSTCC) $(hostc_flags) -o $@ $< \
  97                 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
  98 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
  99         $(call if_changed_dep,host-csingle)
 100
 101 # Link an executable based on list of .o files, all plain c
 102 # host-cmulti -> executable
 103 quiet_cmd_host-cmulti   = HOSTLD  $@
 104       cmd_host-cmulti   = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \
 105                           $(addprefix $(obj)/,$($(@F)-objs)) \
 106                           $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 107 $(host-cmulti): FORCE
 108         $(call if_changed,host-cmulti)
 109 $(call multi_depend, $(host-cmulti), , -objs)
 110
 111 # Create .o file from a single .c file
 112 # host-cobjs -> .o
 113 quiet_cmd_host-cobjs    = HOSTCC  $@
 114       cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 115 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 116         $(call if_changed_dep,host-cobjs)
 117
 118 # Link an executable based on list of .o files, a mixture of .c and .cc
 119 # host-cxxmulti -> executable
 120 quiet_cmd_host-cxxmulti = HOSTLD  $@
 121       cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \
 122                           $(foreach o,objs cxxobjs,\
 123                           $(addprefix $(obj)/,$($(@F)-$(o)))) \
 124                           $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
 125 $(host-cxxmulti): FORCE
 126         $(call if_changed,host-cxxmulti)
 127 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
 128
 129 # Create .o file from a single .cc (C++) file
 130 quiet_cmd_host-cxxobjs  = HOSTCXX $@
 131       cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 132 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 133         $(call if_changed_dep,host-cxxobjs)
 134
 135 targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 136            $(host-cxxmulti) $(host-cxxobjs) $(host-shared)