| # 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.rst 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),) |
| ifdef building_out_of_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) |
