scripts/Makefile.host

   1 # SPDX-License-Identifier: GPL-2.0
   2 # ==========================================================================
   3 # Building binaries on the host system
   4 # Binaries are used during the compilation of the kernel, for example
   5 # to preprocess a data file.
   6 #
   7 # Both C and C++ are supported, but preferred language is C for such utilities.
   8 #
   9 # Sample syntax (see Documentation/kbuild/makefiles.txt for reference)
  10 # hostprogs-y := bin2hex
  11 # Will compile bin2hex.c and create an executable named bin2hex
  12 #
  13 # hostprogs-y    := lxdialog
  14 # lxdialog-objs := checklist.o lxdialog.o
  15 # Will compile lxdialog.c and checklist.c, and then link the executable
  16 # lxdialog, based on checklist.o and lxdialog.o
  17 #
  18 # hostprogs-y      := qconf
  19 # qconf-cxxobjs   := qconf.o
  20 # qconf-objs      := menu.o
  21 # Will compile qconf as a C++ program, and menu as a C program.
  22 # They are linked as C++ code to the executable qconf
  23
  24 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
  25 host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
  26 host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-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 # Object (.o) files used by the shared libaries
  49 host-cshobjs    := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
  50 host-cxxshobjs  := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
  51
  52 host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  53 host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  54 host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  55 host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  56 host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  57 host-cshlib     := $(addprefix $(obj)/,$(host-cshlib))
  58 host-cxxshlib   := $(addprefix $(obj)/,$(host-cxxshlib))
  59 host-cshobjs    := $(addprefix $(obj)/,$(host-cshobjs))
  60 host-cxxshobjs  := $(addprefix $(obj)/,$(host-cxxshobjs))
  61
  62 #####
  63 # Handle options to gcc. Support building with separate output directory
  64
  65 _hostc_flags   = $(KBUILD_HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
  66                  $(HOSTCFLAGS_$(basetarget).o)
  67 _hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
  68                  $(HOSTCXXFLAGS_$(basetarget).o)
  69
  70 __hostc_flags   = $(_hostc_flags)
  71 __hostcxx_flags = $(_hostcxx_flags)
  72
  73 ifeq ($(KBUILD_EXTMOD),)
  74 ifneq ($(KBUILD_SRC),)
  75 __hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  76 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  77 endif
  78 endif
  79
  80 hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  81 hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  82
  83 #####
  84 # Compile programs on the host
  85
  86 # Create executable from a single .c file
  87 # host-csingle -> Executable
  88 quiet_cmd_host-csingle  = HOSTCC  $@
  89       cmd_host-csingle  = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
  90                 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
  91 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
  92         $(call if_changed_dep,host-csingle)
  93
  94 # Link an executable based on list of .o files, all plain c
  95 # host-cmulti -> executable
  96 quiet_cmd_host-cmulti   = HOSTLD  $@
  97       cmd_host-cmulti   = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
  98                           $(addprefix $(obj)/,$($(@F)-objs)) \
  99                           $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
 100 $(host-cmulti): FORCE
 101         $(call if_changed,host-cmulti)
 102 $(call multi_depend, $(host-cmulti), , -objs)
 103
 104 # Create .o file from a single .c file
 105 # host-cobjs -> .o
 106 quiet_cmd_host-cobjs    = HOSTCC  $@
 107       cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 108 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 109         $(call if_changed_dep,host-cobjs)
 110
 111 # Link an executable based on list of .o files, a mixture of .c and .cc
 112 # host-cxxmulti -> executable
 113 quiet_cmd_host-cxxmulti = HOSTLD  $@
 114       cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
 115                           $(foreach o,objs cxxobjs,\
 116                           $(addprefix $(obj)/,$($(@F)-$(o)))) \
 117                           $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
 118 $(host-cxxmulti): FORCE
 119         $(call if_changed,host-cxxmulti)
 120 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
 121
 122 # Create .o file from a single .cc (C++) file
 123 quiet_cmd_host-cxxobjs  = HOSTCXX $@
 124       cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 125 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 126         $(call if_changed_dep,host-cxxobjs)
 127
 128 # Compile .c file, create position independent .o file
 129 # host-cshobjs -> .o
 130 quiet_cmd_host-cshobjs  = HOSTCC  -fPIC $@
 131       cmd_host-cshobjs  = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
 132 $(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
 133         $(call if_changed_dep,host-cshobjs)
 134
 135 # Compile .c file, create position independent .o file
 136 # Note that plugin capable gcc versions can be either C or C++ based
 137 # therefore plugin source files have to be compilable in both C and C++ mode.
 138 # This is why a C++ compiler is invoked on a .c file.
 139 # host-cxxshobjs -> .o
 140 quiet_cmd_host-cxxshobjs        = HOSTCXX -fPIC $@
 141       cmd_host-cxxshobjs        = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
 142 $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
 143         $(call if_changed_dep,host-cxxshobjs)
 144
 145 # Link a shared library, based on position independent .o files
 146 # *.o -> .so shared library (host-cshlib)
 147 quiet_cmd_host-cshlib   = HOSTLLD -shared $@
 148       cmd_host-cshlib   = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
 149                           $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 150                           $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
 151 $(host-cshlib): FORCE
 152         $(call if_changed,host-cshlib)
 153 $(call multi_depend, $(host-cshlib), .so, -objs)
 154
 155 # Link a shared library, based on position independent .o files
 156 # *.o -> .so shared library (host-cxxshlib)
 157 quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
 158       cmd_host-cxxshlib = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
 159                           $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 160                           $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
 161 $(host-cxxshlib): FORCE
 162         $(call if_changed,host-cxxshlib)
 163 $(call multi_depend, $(host-cxxshlib), .so, -objs)
 164
 165 targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 166            $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)