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# 26# Sample syntax (see Documentation/kbuild/makefiles.rst for reference) 27# hostprogs := bin2hex 28# Will compile bin2hex.c and create an executable named bin2hex 29# 30# hostprogs := lxdialog 31# lxdialog-objs := checklist.o lxdialog.o 32# Will compile lxdialog.c and checklist.c, and then link the executable 33# lxdialog, based on checklist.o and lxdialog.o 34# 35# hostprogs := qconf 36# qconf-cxxobjs := qconf.o 37# qconf-objs := menu.o 38# Will compile qconf as a C++ program, and menu as a C program. 39# They are linked as C++ code to the executable qconf 40 41# C code 42# Executables compiled from a single .c file 43host-csingle := $(foreach m,$(hostprogs), \ 44 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) 45 46# C executables linked based on several .o files 47host-cmulti := $(foreach m,$(hostprogs),\ 48 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 49 50# Object (.o) files compiled from .c files 51host-cobjs := $(sort $(foreach m,$(hostprogs),$($(m)-objs))) 52 53# C++ code 54# C++ executables compiled from at least one .cc file 55# and zero or more .c files 56host-cxxmulti := $(foreach m,$(hostprogs),$(if $($(m)-cxxobjs),$(m))) 57 58# C++ Object (.o) files compiled from .cc files 59host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 60 61host-csingle := $(addprefix $(obj)/,$(host-csingle)) 62host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 63host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 64host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 65host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 66 67##### 68# Handle options to gcc. Support building with separate output directory 69 70_hostc_flags = $(KBUILD_HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 71 $(HOSTCFLAGS_$(target-stem).o) 72_hostcxx_flags = $(KBUILD_HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 73 $(HOSTCXXFLAGS_$(target-stem).o) 74 75# $(objtree)/$(obj) for including generated headers from checkin source files 76ifeq ($(KBUILD_EXTMOD),) 77ifdef building_out_of_srctree 78_hostc_flags += -I $(objtree)/$(obj) 79_hostcxx_flags += -I $(objtree)/$(obj) 80endif 81endif 82 83hostc_flags = -Wp,-MMD,$(depfile) $(_hostc_flags) 84hostcxx_flags = -Wp,-MMD,$(depfile) $(_hostcxx_flags) 85 86##### 87# Compile programs on the host 88 89# Create executable from a single .c file 90# host-csingle -> Executable 91quiet_cmd_host-csingle = HOSTCC $@ 92 cmd_host-csingle = $(HOSTCC) $(hostc_flags) $(KBUILD_HOSTLDFLAGS) -o $@ $< \ 93 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) 94$(host-csingle): $(obj)/%: $(src)/%.c FORCE 95 $(call if_changed_dep,host-csingle) 96 97# Link an executable based on list of .o files, all plain c 98# host-cmulti -> executable 99quiet_cmd_host-cmulti = HOSTLD $@ 100 cmd_host-cmulti = $(HOSTCC) $(KBUILD_HOSTLDFLAGS) -o $@ \ 101 $(addprefix $(obj)/, $($(target-stem)-objs)) \ 102 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) 103$(host-cmulti): FORCE 104 $(call if_changed,host-cmulti) 105$(call multi_depend, $(host-cmulti), , -objs) 106 107# Create .o file from a single .c file 108# host-cobjs -> .o 109quiet_cmd_host-cobjs = HOSTCC $@ 110 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 111$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 112 $(call if_changed_dep,host-cobjs) 113 114# Link an executable based on list of .o files, a mixture of .c and .cc 115# host-cxxmulti -> executable 116quiet_cmd_host-cxxmulti = HOSTLD $@ 117 cmd_host-cxxmulti = $(HOSTCXX) $(KBUILD_HOSTLDFLAGS) -o $@ \ 118 $(foreach o,objs cxxobjs,\ 119 $(addprefix $(obj)/, $($(target-stem)-$(o)))) \ 120 $(KBUILD_HOSTLDLIBS) $(HOSTLDLIBS_$(target-stem)) 121$(host-cxxmulti): FORCE 122 $(call if_changed,host-cxxmulti) 123$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 124 125# Create .o file from a single .cc (C++) file 126quiet_cmd_host-cxxobjs = HOSTCXX $@ 127 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 128$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 129 $(call if_changed_dep,host-cxxobjs) 130 131targets += $(host-csingle) $(host-cmulti) $(host-cobjs) \ 132 $(host-cxxmulti) $(host-cxxobjs) 133