scripts/Makefile.host

   1 # SPDX-License-Identifier: GPL-2.0
   2
   3 # LEX
   4 # ---------------------------------------------------------------------------
   5 quiet_cmd_flex = LEX     $@
   6       cmd_flex = $(LEX) -o$@ -L $<
   7
   8 $(obj)/%.lex.c: $(src)/%.l FORCE
   9         $(call if_changed,flex)
  10
  11 # YACC
  12 # ---------------------------------------------------------------------------
  13 quiet_cmd_bison = YACC    $(basename $@).[ch]
  14       cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $<
  15
  16 $(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE
  17         $(call if_changed,bison)
  18
  19 # ==========================================================================
  20 # Building binaries on the host system
  21 # Binaries are used during the compilation of the kernel, for example
  22 # to preprocess a data file.
  23 #
  24 # Both C and C++ are supported, but preferred language is C for such utilities.
  25 #
  26 # Sample syntax (see Documentation/kbuild/makefiles.rst for reference)
  27 # hostprogs := bin2hex
  28 # Will compile bin2hex.c and create an executable named bin2hex
  29 #
  30 # hostprogs     := lxdialog
  31 # lxdialog-objs := checklist.o lxdialog.o
  32 # Will compile lxdialog.c and checklist.c, and then link the executable
  33 # lxdialog, based on checklist.o and lxdialog.o
  34 #
  35 # hostprogs       := qconf
  36 # qconf-cxxobjs   := qconf.o
  37 # qconf-objs      := menu.o
  38 # Will compile qconf as a C++ program, and menu as a C program.
  39 # They are linked as C++ code to the executable qconf
  40
  41 # C code
  42 # Executables compiled from a single .c file
  43 host-csingle    := $(foreach m,$(hostprogs), \
  44                         $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
  45
  46 # C executables linked based on several .o files
  47 host-cmulti     := $(foreach m,$(hostprogs),\
  48                    $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  49
  50 # Object (.o) files compiled from .c files
  51 host-cobjs      := $(sort $(foreach m,$(hostprogs),$($(m)-objs)))
  52
  53 # C++ code
  54 # C++ executables compiled from at least one .cc file
  55 # and zero or more .c files
  56 host-cxxmulti   := $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m)))
  57
  58 # C++ Object (.o) files compiled from .cc files
  59 host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  60
  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
  67 #####
  68 # Handle options to gcc. Support building with separate output directory
  69
  70 _hostc_flags   = $(KBUILD_HOSTCFLAGS)   $(HOST_EXTRACFLAGS)   \
  71                  $(HOSTCFLAGS_$(target-stem).o)
  72 _hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \
  73                  $(HOSTCXXFLAGS_$(target-stem).o)
  74
  75 # $(objtree)/$(obj) for including generated headers from checkin source files
  76 ifeq ($(KBUILD_EXTMOD),)
  77 ifdef building_out_of_srctree
  78 _hostc_flags   += -I $(objtree)/$(obj)
  79 _hostcxx_flags += -I $(objtree)/$(obj)
  80 endif
  81 endif
  82
  83 hostc_flags    = -Wp,-MMD,$(depfile) $(_hostc_flags)
  84 hostcxx_flags  = -Wp,-MMD,$(depfile) $(_hostcxx_flags)
  85
  86 #####
  87 # Compile programs on the host
  88
  89 # Create executable from a single .c file
  90 # host-csingle -> Executable
  91 quiet_cmd_host-csingle  = HOSTCC  $@
  92       cmd_host-csingle  = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
  93                 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
  94 $(host-csingle): $(obj)/%: $(src)/%.c FORCE
  95         $(call if_changed_dep,host-csingle)
  96
  97 # Link an executable based on list of .o files, all plain c
  98 # host-cmulti -> executable
  99 quiet_cmd_host-cmulti   = HOSTLD  $@
 100       cmd_host-cmulti   = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
 101                           $(addprefix $(obj)/, $($(target-stem)-objs)) \
 102                           $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 103 $(host-cmulti): FORCE
 104         $(call if_changed,host-cmulti)
 105 $(call multi_depend, $(host-cmulti), , -objs)
 106
 107 # Create .o file from a single .c file
 108 # host-cobjs -> .o
 109 quiet_cmd_host-cobjs    = HOSTCC  $@
 110       cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 111 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 112         $(call if_changed_dep,host-cobjs)
 113
 114 # Link an executable based on list of .o files, a mixture of .c and .cc
 115 # host-cxxmulti -> executable
 116 quiet_cmd_host-cxxmulti = HOSTLD  $@
 117       cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
 118                           $(foreach o,objs cxxobjs,\
 119                           $(addprefix $(obj)/, $($(target-stem)-$(o)))) \
 120                           $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem))
 121 $(host-cxxmulti): FORCE
 122         $(call if_changed,host-cxxmulti)
 123 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
 124
 125 # Create .o file from a single .cc (C++) file
 126 quiet_cmd_host-cxxobjs  = HOSTCXX $@
 127       cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 128 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 129         $(call if_changed_dep,host-cxxobjs)
 130
 131 targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \
 132            $(host-cxxmulti) $(host-cxxobjs)