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# SPDX-License-Identifier: GPL-2.0 # LEX # --------------------------------------------------------------------------- quiet_cmd_flex = LEX $@ cmd_flex = $(LEX) -o$@ -L $< $(obj)/%.lex.c: $(src)/%.l FORCE $(call if_changed,flex) # YACC # --------------------------------------------------------------------------- quiet_cmd_bison = YACC $(basename $@).[ch] cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $< $(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE $(call if_changed,bison) # ========================================================================== # 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. # Rust is also supported, but it may only be used in scenarios where a Rust # toolchain is required to be available (e.g. when `CONFIG_RUST` is enabled). # # Sample syntax (see Documentation/kbuild/makefiles.rst for reference) # hostprogs := bin2hex # Will compile bin2hex.c and create an executable named bin2hex # # hostprogs := 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 := 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 := target # target-rust := y # Will compile `target` as a Rust program, using `target.rs` as the crate root. # The crate may consist of several source files. # C code # Executables compiled from a single .c file host-csingle := $(foreach m,$(hostprogs), \ $(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-rust),,$(m))) # C executables linked based on several .o files host-cmulti := $(foreach m,$(hostprogs),\ $(if $($(m)-cxxobjs)$($(m)-rust),,$(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))) # Rust code # Executables compiled from a single Rust crate (which may consist of # one or more .rs files) host-rust := $(foreach m,$(hostprogs),$(if $($(m)-rust),$(m))) 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-rust := $(addprefix $(obj)/,$(host-rust)) ##### # Handle options to gcc. Support building with separate output directory hostc_flags = -Wp,-MMD,$(depfile) \ $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ $(HOSTCFLAGS_$(target-stem).o) hostcxx_flags = -Wp,-MMD,$(depfile) \ $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ $(HOSTCXXFLAGS_$(target-stem).o) # `--out-dir` is required to avoid temporaries being created by `rustc` in the # current working directory, which may be not accessible in the out-of-tree # modules case. hostrust_flags = --out-dir $(dir $@) --emit=dep-info=$(depfile) \ -Clinker-flavor=gcc -Clinker=$(HOSTCC) \ -Clink-args='$(call escsq,$(KBUILD_HOSTLDFLAGS))' \ $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \ $(HOSTRUSTFLAGS_$(target-stem)) # $(objtree)/$(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 ##### # 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) $(HOSTLDLIBS_$(target-stem)) $(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)/, $($(target-stem)-objs)) \ $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) $(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)/, $($(target-stem)-$(o)))) \ $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) $(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) # Create executable from a single Rust crate (which may consist of # one or more `.rs` files) # host-rust -> Executable quiet_cmd_host-rust = HOSTRUSTC $@ cmd_host-rust = \ $(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $< $(host-rust): $(obj)/%: $(src)/%.rs FORCE $(call if_changed_dep,host-rust) targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \ $(host-cxxmulti) $(host-cxxobjs) $(host-rust)
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