LXR linux/scripts/Makefile.host

   1# SPDX-License-Identifier: GPL-2.0
   2
   3# LEX
   4# ---------------------------------------------------------------------------
   5quiet_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# ---------------------------------------------------------------------------
  13quiet_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
  43host-csingle    := $(foreach m,$(hostprogs), \
  44                        $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
  45
  46# C executables linked based on several .o files
  47host-cmulti     := $(foreach m,$(hostprogs),\
  48                   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  49
  50# Object (.o) files compiled from .c files
  51host-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
  56host-cxxmulti   := $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m)))
  57
  58# C++ Object (.o) files compiled from .cc files
  59host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  60
  61host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  62host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  63host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  64host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  65host-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
  76ifeq ($(KBUILD_EXTMOD),)
  77ifdef building_out_of_srctree
  78_hostc_flags   += -I $(objtree)/$(obj)
  79_hostcxx_flags += -I $(objtree)/$(obj)
  80endif
  81endif
  82
  83hostc_flags    = -Wp,-MMD,$(depfile) $(_hostc_flags)
  84hostcxx_flags  = -Wp,-MMD,$(depfile) $(_hostcxx_flags)
  85
  86#####
  87# Compile programs on the host
  88
  89# Create executable from a single .c file
  90# host-csingle -> Executable
  91quiet_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
  99quiet_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
 109quiet_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
 116quiet_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
 126quiet_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
 131targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \
 132           $(host-cxxmulti) $(host-cxxobjs)
 133