1# ========================================================================== 2# Building binaries on the host system 3# Binaries are used during the compilation of the kernel, for example 4# to preprocess a data file. 5# 6# Both C and C++ are supported, but preferred language is C for such utilities. 7# 8# Sample syntax (see Documentation/kbuild/makefiles.txt for reference) 9# hostprogs-y := bin2hex 10# Will compile bin2hex.c and create an executable named bin2hex 11# 12# hostprogs-y := lxdialog 13# lxdialog-objs := checklist.o lxdialog.o 14# Will compile lxdialog.c and checklist.c, and then link the executable 15# lxdialog, based on checklist.o and lxdialog.o 16# 17# hostprogs-y := qconf 18# qconf-cxxobjs := qconf.o 19# qconf-objs := menu.o 20# Will compile qconf as a C++ program, and menu as a C program. 21# They are linked as C++ code to the executable qconf 22 23# hostprogs-y := conf 24# conf-objs := conf.o libkconfig.so 25# libkconfig-objs := expr.o type.o 26# Will create a shared library named libkconfig.so that consists of 27# expr.o and type.o (they are both compiled as C code and the object files 28# are made as position independent code). 29# conf.c is compiled as a C program, and conf.o is linked together with 30# libkconfig.so as the executable conf. 31# Note: Shared libraries consisting of C++ files are not supported 32 33__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m)) 34 35# C code 36# Executables compiled from a single .c file 37host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m))) 38 39# C executables linked based on several .o files 40host-cmulti := $(foreach m,$(__hostprogs),\ 41 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 42 43# Object (.o) files compiled from .c files 44host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 45 46# C++ code 47# C++ executables compiled from at least on .cc file 48# and zero or more .c files 49host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 50 51# C++ Object (.o) files compiled from .cc files 52host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 53 54# Shared libaries (only .c supported) 55# Shared libraries (.so) - all .so files referenced in "xxx-objs" 56host-cshlib := $(sort $(filter %.so, $(host-cobjs))) 57# Remove .so files from "xxx-objs" 58host-cobjs := $(filter-out %.so,$(host-cobjs)) 59 60#Object (.o) files used by the shared libaries 61host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs)))) 62 63# output directory for programs/.o files 64# hostprogs-y := tools/build may have been specified. Retrieve directory 65host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f)))) 66# directory of .o files from prog-objs notation 67host-objdirs += $(foreach f,$(host-cmulti), \ 68 $(foreach m,$($(f)-objs), \ 69 $(if $(dir $(m)),$(dir $(m))))) 70# directory of .o files from prog-cxxobjs notation 71host-objdirs += $(foreach f,$(host-cxxmulti), \ 72 $(foreach m,$($(f)-cxxobjs), \ 73 $(if $(dir $(m)),$(dir $(m))))) 74 75host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 76 77 78__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 79host-csingle := $(addprefix $(obj)/,$(host-csingle)) 80host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 81host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 82host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 83host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 84host-cshlib := $(addprefix $(obj)/,$(host-cshlib)) 85host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs)) 86host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 87 88obj-dirs += $(host-objdirs) 89 90##### 91# Handle options to gcc. Support building with separate output directory 92 93_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 94 $(HOSTCFLAGS_$(basetarget).o) 95_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 96 $(HOSTCXXFLAGS_$(basetarget).o) 97 98ifeq ($(KBUILD_SRC),) 99__hostc_flags = $(_hostc_flags) 100__hostcxx_flags = $(_hostcxx_flags) 101else 102__hostc_flags = -I$(obj) $(call flags,_hostc_flags) 103__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 104endif 105 106hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 107hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 108 109##### 110# Compile programs on the host 111 112# Create executable from a single .c file 113# host-csingle -> Executable 114quiet_cmd_host-csingle = HOSTCC $@ 115 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 116 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 117$(host-csingle): $(obj)/%: $(src)/%.c FORCE 118 $(call if_changed_dep,host-csingle) 119 120# Link an executable based on list of .o files, all plain c 121# host-cmulti -> executable 122quiet_cmd_host-cmulti = HOSTLD $@ 123 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 124 $(addprefix $(obj)/,$($(@F)-objs)) \ 125 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 126$(host-cmulti): $(obj)/%: $(host-cobjs) $(host-cshlib) FORCE 127 $(call if_changed,host-cmulti) 128 129# Create .o file from a single .c file 130# host-cobjs -> .o 131quiet_cmd_host-cobjs = HOSTCC $@ 132 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 133$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 134 $(call if_changed_dep,host-cobjs) 135 136# Link an executable based on list of .o files, a mixture of .c and .cc 137# host-cxxmulti -> executable 138quiet_cmd_host-cxxmulti = HOSTLD $@ 139 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ 140 $(foreach o,objs cxxobjs,\ 141 $(addprefix $(obj)/,$($(@F)-$(o)))) \ 142 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 143$(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE 144 $(call if_changed,host-cxxmulti) 145 146# Create .o file from a single .cc (C++) file 147quiet_cmd_host-cxxobjs = HOSTCXX $@ 148 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 149$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 150 $(call if_changed_dep,host-cxxobjs) 151 152# Compile .c file, create position independent .o file 153# host-cshobjs -> .o 154quiet_cmd_host-cshobjs = HOSTCC -fPIC $@ 155 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $< 156$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE 157 $(call if_changed_dep,host-cshobjs) 158 159# Link a shared library, based on position independent .o files 160# *.o -> .so shared library (host-cshlib) 161quiet_cmd_host-cshlib = HOSTLLD -shared $@ 162 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \ 163 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 164 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 165$(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE 166 $(call if_changed,host-cshlib) 167 168targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 169 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) 170