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scripts/Makefile.host
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# SPDX-License-Identifier: GPL-2.0 |
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# ========================================================================== # Building binaries on the host system # Binaries are used during the compilation of the kernel, for example # to preprocess a data file. # |
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# Both C and C++ are supported, but preferred language is C for such utilities. |
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# |
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# Sample syntax (see Documentation/kbuild/makefiles.txt for reference) |
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# 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 |
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__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m)) |
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host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m)) host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m)) |
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# C code # Executables compiled from a single .c file |
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host-csingle := $(foreach m,$(__hostprogs), \ $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) |
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# 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 |
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# C++ executables compiled from at least one .cc file |
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# 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))) |
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# 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)))) |
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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)) |
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host-cshlib := $(addprefix $(obj)/,$(host-cshlib)) host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib)) host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs)) host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs)) |
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##### # Handle options to gcc. Support building with separate output directory |
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_hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ |
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$(HOSTCFLAGS_$(basetarget).o) |
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_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ |
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$(HOSTCXXFLAGS_$(basetarget).o) |
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# $(objtree)/$(obj) for including generated headers from checkin source files |
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ifeq ($(KBUILD_EXTMOD),) |
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ifneq ($(srctree),.) |
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_hostc_flags += -I $(objtree)/$(obj) _hostcxx_flags += -I $(objtree)/$(obj) |
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endif |
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endif |
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hostc_flags = -Wp,-MD,$(depfile) $(_hostc_flags) hostcxx_flags = -Wp,-MD,$(depfile) $(_hostcxx_flags) |
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##### # Compile programs on the host # Create executable from a single .c file # host-csingle -> Executable quiet_cmd_host-csingle = HOSTCC $@ |
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cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \ |
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F)) |
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$(host-csingle): $(obj)/%: $(src)/%.c FORCE |
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$(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 $@ |
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cmd_host-cmulti = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \ |
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$(addprefix $(obj)/,$($(@F)-objs)) \ |
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F)) |
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$(host-cmulti): FORCE |
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$(call if_changed,host-cmulti) |
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$(call multi_depend, $(host-cmulti), , -objs) |
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# Create .o file from a single .c file # host-cobjs -> .o quiet_cmd_host-cobjs = HOSTCC $@ cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< |
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$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE |
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$(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 $@ |
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cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \ |
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$(foreach o,objs cxxobjs,\ $(addprefix $(obj)/,$($(@F)-$(o)))) \ |
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F)) |
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$(host-cxxmulti): FORCE |
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$(call if_changed,host-cxxmulti) |
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$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) |
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# Create .o file from a single .cc (C++) file quiet_cmd_host-cxxobjs = HOSTCXX $@ cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< |
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$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE |
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$(call if_changed_dep,host-cxxobjs) |
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# 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 $@ |
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cmd_host-cshlib = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \ |
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$(addprefix $(obj)/,$($(@F:.so=-objs))) \ |
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F)) |
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$(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 $@ |
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cmd_host-cxxshlib = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -shared -o $@ \ |
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$(addprefix $(obj)/,$($(@F:.so=-objs))) \ |
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$(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(@F)) |
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$(host-cxxshlib): FORCE $(call if_changed,host-cxxshlib) $(call multi_depend, $(host-cxxshlib), .so, -objs) |
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targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ |
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$(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs) |