1# SPDX-License-Identifier: GPL-2.0 2 3# LEX 4# --------------------------------------------------------------------------- 5quiet_cmd_flex = LEX $@ 6 cmd_flex = $(LEX) -o$@ -L $< 7 8$(obj)/%.lex.c: $(src)/%.l FORCE 9 $(call if_changed,flex) 10 11# YACC 12# --------------------------------------------------------------------------- 13quiet_cmd_bison = YACC $(basename $@).[ch] 14 cmd_bison = $(YACC) -o $(basename $@).c --defines=$(basename $@).h -t -l $< 15 16$(obj)/%.tab.c $(obj)/%.tab.h: $(src)/%.y FORCE 17 $(call if_changed,bison) 18 19# ========================================================================== 20# Building binaries on the host system 21# Binaries are used during the compilation of the kernel, for example 22# to preprocess a data file. 23# 24# Both C and C++ are supported, but preferred language is C for such utilities. 25# Rust is also supported, but it may only be used in scenarios where a Rust 26# toolchain is required to be available (e.g. when `CONFIG_RUST` is enabled). 27# 28# Sample syntax (see Documentation/kbuild/makefiles.rst for reference) 29# hostprogs := bin2hex 30# Will compile bin2hex.c and create an executable named bin2hex 31# 32# hostprogs := lxdialog 33# lxdialog-objs := checklist.o lxdialog.o 34# Will compile lxdialog.c and checklist.c, and then link the executable 35# lxdialog, based on checklist.o and lxdialog.o 36# 37# hostprogs := qconf 38# qconf-cxxobjs := qconf.o 39# qconf-objs := menu.o 40# Will compile qconf as a C++ program, and menu as a C program. 41# They are linked as C++ code to the executable qconf 42# 43# hostprogs := target 44# target-rust := y 45# Will compile `target` as a Rust program, using `target.rs` as the crate root. 46# The crate may consist of several source files. 47 48# C code 49# Executables compiled from a single .c file 50host-csingle := $(foreach m,$(hostprogs), \ 51 $(if $($(m)-objs)$($(m)-cxxobjs)$($(m)-rust),,$(m))) 52 53# C executables linked based on several .o files 54host-cmulti := $(foreach m,$(hostprogs),\ 55 $(if $($(m)-cxxobjs)$($(m)-rust),,$(if $($(m)-objs),$(m)))) 56 57# Object (.o) files compiled from .c files 58host-cobjs := $(sort $(foreach m,$(hostprogs),$($(m)-objs))) 59 60# C++ code 61# C++ executables compiled from at least one .cc file 62# and zero or more .c files 63host-cxxmulti := $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m))) 64 65# C++ Object (.o) files compiled from .cc files 66host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 67 68# Rust code 69# Executables compiled from a single Rust crate (which may consist of 70# one or more .rs files) 71host-rust := $(foreach m,$(hostprogs),$(if $($(m)-rust),$(m))) 72 73host-csingle := $(addprefix $(obj)/,$(host-csingle)) 74host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 75host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 76host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 77host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 78host-rust := $(addprefix $(obj)/,$(host-rust)) 79 80##### 81# Handle options to gcc. Support building with separate output directory 82 83hostc_flags = -Wp,-MMD,$(depfile) \ 84 $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 85 $(HOSTCFLAGS_$(target-stem).o) 86hostcxx_flags = -Wp,-MMD,$(depfile) \ 87 $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 88 $(HOSTCXXFLAGS_$(target-stem).o) 89 90# `--out-dir` is required to avoid temporaries being created by `rustc` in the 91# current working directory, which may be not accessible in the out-of-tree 92# modules case. 93hostrust_flags = --out-dir $(dir $@) --emit=dep-info=$(depfile) \ 94 $(KBUILD_HOSTRUSTFLAGS) $(HOST_EXTRARUSTFLAGS) \ 95 $(HOSTRUSTFLAGS_$(target-stem)) 96 97# $(objtree)/$(obj) for including generated headers from checkin source files 98ifeq ($(KBUILD_EXTMOD),) 99ifdef building_out_of_srctree 100hostc_flags += -I $(objtree)/$(obj) 101hostcxx_flags += -I $(objtree)/$(obj) 102endif 103endif 104 105##### 106# Compile programs on the host 107 108# Create executable from a single .c file 109# host-csingle -> Executable 110quiet_cmd_host-csingle = HOSTCC $@ 111 cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \ 112 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) 113$(host-csingle): $(obj)/%: $(src)/%.c FORCE 114 $(call if_changed_dep,host-csingle) 115 116# Link an executable based on list of .o files, all plain c 117# host-cmulti -> executable 118quiet_cmd_host-cmulti = HOSTLD $@ 119 cmd_host-cmulti = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \ 120 $(addprefix $(obj)/, $($(target-stem)-objs)) \ 121 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) 122$(host-cmulti): FORCE 123 $(call if_changed,host-cmulti) 124$(call multi_depend, $(host-cmulti), , -objs) 125 126# Create .o file from a single .c file 127# host-cobjs -> .o 128quiet_cmd_host-cobjs = HOSTCC $@ 129 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 130$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 131 $(call if_changed_dep,host-cobjs) 132 133# Link an executable based on list of .o files, a mixture of .c and .cc 134# host-cxxmulti -> executable 135quiet_cmd_host-cxxmulti = HOSTLD $@ 136 cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \ 137 $(foreach o,objs cxxobjs,\ 138 $(addprefix $(obj)/, $($(target-stem)-$(o)))) \ 139 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) 140$(host-cxxmulti): FORCE 141 $(call if_changed,host-cxxmulti) 142$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 143 144# Create .o file from a single .cc (C++) file 145quiet_cmd_host-cxxobjs = HOSTCXX $@ 146 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 147$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 148 $(call if_changed_dep,host-cxxobjs) 149 150# Create executable from a single Rust crate (which may consist of 151# one or more `.rs` files) 152# host-rust -> Executable 153quiet_cmd_host-rust = HOSTRUSTC $@ 154 cmd_host-rust = \ 155 $(HOSTRUSTC) $(hostrust_flags) --emit=link=$@ $< 156$(host-rust): $(obj)/%: $(src)/%.rs FORCE 157 $(call if_changed_dep,host-rust) 158 159targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \ 160 $(host-cxxmulti) $(host-cxxobjs) $(host-rust) 161