LXR linux/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))
  25host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))
  26host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
  27
  28# C code
  29# Executables compiled from a single .c file
  30host-csingle    := $(foreach m,$(__hostprogs), \
  31                        $(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))
  32
  33# C executables linked based on several .o files
  34host-cmulti     := $(foreach m,$(__hostprogs),\
  35                   $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))
  36
  37# Object (.o) files compiled from .c files
  38host-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
  43host-cxxmulti   := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
  44
  45# C++ Object (.o) files compiled from .cc files
  46host-cxxobjs    := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
  47
  48# Object (.o) files used by the shared libaries
  49host-cshobjs    := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
  50host-cxxshobjs  := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
  51
  52host-csingle    := $(addprefix $(obj)/,$(host-csingle))
  53host-cmulti     := $(addprefix $(obj)/,$(host-cmulti))
  54host-cobjs      := $(addprefix $(obj)/,$(host-cobjs))
  55host-cxxmulti   := $(addprefix $(obj)/,$(host-cxxmulti))
  56host-cxxobjs    := $(addprefix $(obj)/,$(host-cxxobjs))
  57host-cshlib     := $(addprefix $(obj)/,$(host-cshlib))
  58host-cxxshlib   := $(addprefix $(obj)/,$(host-cxxshlib))
  59host-cshobjs    := $(addprefix $(obj)/,$(host-cshobjs))
  60host-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
  70ifeq ($(KBUILD_SRC),)
  71__hostc_flags   = $(_hostc_flags)
  72__hostcxx_flags = $(_hostcxx_flags)
  73else
  74__hostc_flags   = -I$(obj) $(call flags,_hostc_flags)
  75__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)
  76endif
  77
  78hostc_flags    = -Wp,-MD,$(depfile) $(__hostc_flags)
  79hostcxx_flags  = -Wp,-MD,$(depfile) $(__hostcxx_flags)
  80
  81#####
  82# Compile programs on the host
  83
  84# Create executable from a single .c file
  85# host-csingle -> Executable
  86quiet_cmd_host-csingle  = HOSTCC  $@
  87      cmd_host-csingle  = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \
  88                $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
  89$(host-csingle): $(obj)/%: $(src)/%.c FORCE
  90        $(call if_changed_dep,host-csingle)
  91
  92# Link an executable based on list of .o files, all plain c
  93# host-cmulti -> executable
  94quiet_cmd_host-cmulti   = HOSTLD  $@
  95      cmd_host-cmulti   = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \
  96                          $(addprefix $(obj)/,$($(@F)-objs)) \
  97                          $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
  98$(host-cmulti): FORCE
  99        $(call if_changed,host-cmulti)
 100$(call multi_depend, $(host-cmulti), , -objs)
 101
 102# Create .o file from a single .c file
 103# host-cobjs -> .o
 104quiet_cmd_host-cobjs    = HOSTCC  $@
 105      cmd_host-cobjs    = $(HOSTCC) $(hostc_flags) -c -o $@ $<
 106$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE
 107        $(call if_changed_dep,host-cobjs)
 108
 109# Link an executable based on list of .o files, a mixture of .c and .cc
 110# host-cxxmulti -> executable
 111quiet_cmd_host-cxxmulti = HOSTLD  $@
 112      cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \
 113                          $(foreach o,objs cxxobjs,\
 114                          $(addprefix $(obj)/,$($(@F)-$(o)))) \
 115                          $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
 116$(host-cxxmulti): FORCE
 117        $(call if_changed,host-cxxmulti)
 118$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)
 119
 120# Create .o file from a single .cc (C++) file
 121quiet_cmd_host-cxxobjs  = HOSTCXX $@
 122      cmd_host-cxxobjs  = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<
 123$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
 124        $(call if_changed_dep,host-cxxobjs)
 125
 126# Compile .c file, create position independent .o file
 127# host-cshobjs -> .o
 128quiet_cmd_host-cshobjs  = HOSTCC  -fPIC $@
 129      cmd_host-cshobjs  = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
 130$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
 131        $(call if_changed_dep,host-cshobjs)
 132
 133# Compile .c file, create position independent .o file
 134# Note that plugin capable gcc versions can be either C or C++ based
 135# therefore plugin source files have to be compilable in both C and C++ mode.
 136# This is why a C++ compiler is invoked on a .c file.
 137# host-cxxshobjs -> .o
 138quiet_cmd_host-cxxshobjs        = HOSTCXX -fPIC $@
 139      cmd_host-cxxshobjs        = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
 140$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
 141        $(call if_changed_dep,host-cxxshobjs)
 142
 143# Link a shared library, based on position independent .o files
 144# *.o -> .so shared library (host-cshlib)
 145quiet_cmd_host-cshlib   = HOSTLLD -shared $@
 146      cmd_host-cshlib   = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
 147                          $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 148                          $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
 149$(host-cshlib): FORCE
 150        $(call if_changed,host-cshlib)
 151$(call multi_depend, $(host-cshlib), .so, -objs)
 152
 153# Link a shared library, based on position independent .o files
 154# *.o -> .so shared library (host-cxxshlib)
 155quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
 156      cmd_host-cxxshlib = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \
 157                          $(addprefix $(obj)/,$($(@F:.so=-objs))) \
 158                          $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))
 159$(host-cxxshlib): FORCE
 160        $(call if_changed,host-cxxshlib)
 161$(call multi_depend, $(host-cxxshlib), .so, -objs)
 162
 163targets += $(host-csingle)  $(host-cmulti) $(host-cobjs)\
 164           $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
 165