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++ is supported, but preferred language is C for such utilities. 7# 8# Samle syntax (see Documentation/kbuild/makefile.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 consist of 27# expr.o and type.o (they are both compiled as C code and the object file 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# hostprogs-y := tools/build may have been specified. Retreive directory 36host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f)))) 37host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 38 39 40# C code 41# Executables compiled from a single .c file 42host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m))) 43 44# C executables linked based on several .o files 45host-cmulti := $(foreach m,$(__hostprogs),\ 46 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 47 48# Object (.o) files compiled from .c files 49host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 50 51# C++ code 52# C++ executables compiled from at least on .cc file 53# and zero or more .c files 54host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 55 56# C++ Object (.o) files compiled from .cc files 57host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 58 59# Shared libaries (only .c supported) 60# Shared libraries (.so) - all .so files referenced in "xxx-objs" 61host-cshlib := $(sort $(filter %.so, $(host-cobjs))) 62# Remove .so files from "xxx-objs" 63host-cobjs := $(filter-out %.so,$(host-cobjs)) 64 65#Object (.o) files used by the shared libaries 66host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs)))) 67 68__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 69host-csingle := $(addprefix $(obj)/,$(host-csingle)) 70host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 71host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 72host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 73host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 74host-cshlib := $(addprefix $(obj)/,$(host-cshlib)) 75host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs)) 76host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 77 78obj-dirs += $(host-objdirs) 79 80##### 81# Handle options to gcc. Support building with separate output directory 82 83_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 84 $(HOSTCFLAGS_$(basetarget).o) 85_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 86 $(HOSTCXXFLAGS_$(basetarget).o) 87 88ifeq ($(KBUILD_SRC),) 89__hostc_flags = $(_hostc_flags) 90__hostcxx_flags = $(_hostcxx_flags) 91else 92__hostc_flags = -I$(obj) $(call flags,_hostc_flags) 93__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 94endif 95 96hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 97hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 98 99##### 100# Compile programs on the host 101 102# Create executable from a single .c file 103# host-csingle -> Executable 104quiet_cmd_host-csingle = HOSTCC $@ 105 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 106 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 107$(host-csingle): %: %.c FORCE 108 $(call if_changed_dep,host-csingle) 109 110# Link an executable based on list of .o files, all plain c 111# host-cmulti -> executable 112quiet_cmd_host-cmulti = HOSTLD $@ 113 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 114 $(addprefix $(obj)/,$($(@F)-objs)) \ 115 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 116$(host-cmulti): %: $(host-cobjs) $(host-cshlib) FORCE 117 $(call if_changed,host-cmulti) 118 119# Create .o file from a single .c file 120# host-cobjs -> .o 121quiet_cmd_host-cobjs = HOSTCC $@ 122 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 123$(host-cobjs): %.o: %.c FORCE 124 $(call if_changed_dep,host-cobjs) 125 126# Link an executable based on list of .o files, a mixture of .c and .cc 127# host-cxxmulti -> executable 128quiet_cmd_host-cxxmulti = HOSTLD $@ 129 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ 130 $(foreach o,objs cxxobjs,\ 131 $(addprefix $(obj)/,$($(@F)-$(o)))) \ 132 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 133$(host-cxxmulti): %: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE 134 $(call if_changed,host-cxxmulti) 135 136# Create .o file from a single .cc (C++) file 137quiet_cmd_host-cxxobjs = HOSTCXX $@ 138 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 139$(host-cxxobjs): %.o: %.cc FORCE 140 $(call if_changed_dep,host-cxxobjs) 141 142# Compile .c file, create position independent .o file 143# host-cshobjs -> .o 144quiet_cmd_host-cshobjs = HOSTCC -fPIC $@ 145 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $< 146$(host-cshobjs): %.o: %.c FORCE 147 $(call if_changed_dep,host-cshobjs) 148 149# Link a shared library, based on position independent .o files 150# *.o -> .so shared library (host-cshlib) 151quiet_cmd_host-cshlib = HOSTLLD -shared $@ 152 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \ 153 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 154 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 155$(host-cshlib): %: $(host-cshobjs) FORCE 156 $(call if_changed,host-cshlib) 157 158targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 159 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) 160 161