# ========================================================================== # 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-y := conf # conf-objs := conf.o libkconfig.so # libkconfig-objs := expr.o type.o # Will create a shared library named libkconfig.so that consists of # expr.o and type.o (they are both compiled as C code and the object files # are made as position independent code). # conf.c is compiled as a C program, and conf.o is linked together with # libkconfig.so as the executable conf. # Note: Shared libraries consisting of C++ files are not supported __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m)) # C code # Executables compiled from a single .c file host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(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 on .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))) # Shared libaries (only .c supported) # Shared libraries (.so) - all .so files referenced in "xxx-objs" host-cshlib := $(sort $(filter %.so, $(host-cobjs))) # Remove .so files from "xxx-objs" host-cobjs := $(filter-out %.so,$(host-cobjs)) #Object (.o) files used by the shared libaries host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs)))) # output directory for programs/.o files # hostprogs-y := tools/build may have been specified. Retrieve directory host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f)))) # directory of .o files from prog-objs notation host-objdirs += $(foreach f,$(host-cmulti), \ $(foreach m,$($(f)-objs), \ $(if $(dir $(m)),$(dir $(m))))) # directory of .o files from prog-cxxobjs notation host-objdirs += $(foreach f,$(host-cxxmulti), \ $(foreach m,$($(f)-cxxobjs), \ $(if $(dir $(m)),$(dir $(m))))) host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) __hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 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-cshobjs := $(addprefix $(obj)/,$(host-cshobjs)) host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) obj-dirs += $(host-objdirs) ##### # Handle options to gcc. Support building with separate output directory _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ $(HOSTCFLAGS_$(basetarget).o) _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ $(HOSTCXXFLAGS_$(basetarget).o) ifeq ($(KBUILD_SRC),) __hostc_flags = $(_hostc_flags) __hostcxx_flags = $(_hostcxx_flags) else __hostc_flags = -I$(obj) $(call flags,_hostc_flags) __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) endif hostc_flags = -Wp,-MD,$(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) -o $@ $< \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@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) $(HOSTLDFLAGS) -o $@ \ $(addprefix $(obj)/,$($(@F)-objs)) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) $(host-cmulti): $(obj)/%: $(host-cobjs) $(host-cshlib) FORCE $(call if_changed,host-cmulti) # 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) $(HOSTLDFLAGS) -o $@ \ $(foreach o,objs cxxobjs,\ $(addprefix $(obj)/,$($(@F)-$(o)))) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) $(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE $(call if_changed,host-cxxmulti) # 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) # 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) $(HOSTLDFLAGS) -shared -o $@ \ $(addprefix $(obj)/,$($(@F:.so=-objs))) \ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) $(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE $(call if_changed,host-cshlib) targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)