# SPDX-License-Identifier: GPL-2.0

# ==========================================================================

# Building binaries on the host system

# Binaries are used during the compilation of the kernel, for example

# to preprocess a data file.

#

# Both C and C++ are supported, but preferred language is C for such utilities.

#

# Sample syntax (see Documentation/kbuild/makefiles.txt for reference)

# hostprogs-y := bin2hex

# Will compile bin2hex.c and create an executable named bin2hex

#

# hostprogs-y := lxdialog

# lxdialog-objs := checklist.o lxdialog.o

# Will compile lxdialog.c and checklist.c, and then link the executable

# lxdialog, based on checklist.o and lxdialog.o

#

# hostprogs-y := qconf

# qconf-cxxobjs := qconf.o

# qconf-objs := menu.o

# Will compile qconf as a C++ program, and menu as a C program.

# They are linked as C++ code to the executable qconf

__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))

host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m))

host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))

# C code

# Executables compiled from a single .c file

host-csingle := $(foreach m,$(__hostprogs), \

$(if $($(m)-objs)$($(m)-cxxobjs),,$(m)))

# C executables linked based on several .o files

host-cmulti := $(foreach m,$(__hostprogs),\

$(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))

# Object (.o) files compiled from .c files

host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))

# C++ code

# C++ executables compiled from at least one .cc file

# and zero or more .c files

host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))

# C++ Object (.o) files compiled from .cc files

host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))

# Object (.o) files used by the shared libaries

host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))

host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))

host-csingle := $(addprefix $(obj)/,$(host-csingle))

host-cmulti := $(addprefix $(obj)/,$(host-cmulti))

host-cobjs := $(addprefix $(obj)/,$(host-cobjs))

host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))

host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))

host-cshlib := $(addprefix $(obj)/,$(host-cshlib))

host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))

host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))

host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))

#####

# Handle options to gcc. Support building with separate output directory

_hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \

$(HOSTCFLAGS_$(basetarget).o)

_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \

$(HOSTCXXFLAGS_$(basetarget).o)

# $(objtree)/$(obj) for including generated headers from checkin source files

ifeq ($(KBUILD_EXTMOD),)

ifneq ($(srctree),.)

_hostc_flags += -I $(objtree)/$(obj)

_hostcxx_flags += -I $(objtree)/$(obj)

endif

endif

hostc_flags = -Wp,-MD,$(depfile) $(_hostc_flags)

hostcxx_flags = -Wp,-MD,$(depfile) $(_hostcxx_flags)

#####

# Compile programs on the host

# Create executable from a single .c file

# host-csingle -> Executable

quiet_cmd_host-csingle = HOSTCC $@

cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \

$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))

$(host-csingle): $(obj)/%: $(src)/%.c FORCE

$(call if_changed_dep,host-csingle)

# Link an executable based on list of .o files, all plain c

# host-cmulti -> executable

quiet_cmd_host-cmulti = HOSTLD $@

cmd_host-cmulti = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \

$(addprefix $(obj)/,$($(@F)-objs)) \

$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))

$(host-cmulti): FORCE

$(call if_changed,host-cmulti)

$(call multi_depend, $(host-cmulti), , -objs)

# Create .o file from a single .c file

# host-cobjs -> .o

quiet_cmd_host-cobjs = HOSTCC $@

cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<

$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE

$(call if_changed_dep,host-cobjs)

# Link an executable based on list of .o files, a mixture of .c and .cc

# host-cxxmulti -> executable

quiet_cmd_host-cxxmulti = HOSTLD $@

cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \

$(foreach o,objs cxxobjs,\

$(addprefix $(obj)/,$($(@F)-$(o)))) \

$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))

$(host-cxxmulti): FORCE

$(call if_changed,host-cxxmulti)

$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs)

# Create .o file from a single .cc (C++) file

quiet_cmd_host-cxxobjs = HOSTCXX $@

cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<

$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE

$(call if_changed_dep,host-cxxobjs)

# Compile .c file, create position independent .o file

# host-cshobjs -> .o

quiet_cmd_host-cshobjs = HOSTCC -fPIC $@

cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<

$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE

$(call if_changed_dep,host-cshobjs)

# Compile .c file, create position independent .o file

# Note that plugin capable gcc versions can be either C or C++ based

# therefore plugin source files have to be compilable in both C and C++ mode.

# This is why a C++ compiler is invoked on a .c file.

# host-cxxshobjs -> .o

quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@

cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<

$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE

$(call if_changed_dep,host-cxxshobjs)

# Link a shared library, based on position independent .o files

# *.o -> .so shared library (host-cshlib)

quiet_cmd_host-cshlib = HOSTLLD -shared $@

cmd_host-cshlib = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \

$(addprefix $(obj)/,$($(@F:.so=-objs))) \

$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))

$(host-cshlib): FORCE

$(call if_changed,host-cshlib)

$(call multi_depend, $(host-cshlib), .so, -objs)

# Link a shared library, based on position independent .o files

# *.o -> .so shared library (host-cxxshlib)

quiet_cmd_host-cxxshlib = HOSTLLD -shared $@

cmd_host-cxxshlib = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \

$(addprefix $(obj)/,$($(@F:.so=-objs))) \

$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F))

$(host-cxxshlib): FORCE

$(call if_changed,host-cxxshlib)

$(call multi_depend, $(host-cxxshlib), .so, -objs)

targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\

$(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)