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# hostcc-option 24# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586) 25 26hostcc-option = $(call try-run,\ 27 $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2)) 28 29__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m)) 30host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m)) 31host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m)) 32 33# C code 34# Executables compiled from a single .c file 35host-csingle := $(foreach m,$(__hostprogs), \ 36 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) 37 38# C executables linked based on several .o files 39host-cmulti := $(foreach m,$(__hostprogs),\ 40 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 41 42# Object (.o) files compiled from .c files 43host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 44 45# C++ code 46# C++ executables compiled from at least one .cc file 47# and zero or more .c files 48host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 49 50# C++ Object (.o) files compiled from .cc files 51host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 52 53# Object (.o) files used by the shared libaries 54host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs)))) 55host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs)))) 56 57# output directory for programs/.o files 58# hostprogs-y := tools/build may have been specified. 59# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation 60host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs)) 61 62host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 63 64 65__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 66host-csingle := $(addprefix $(obj)/,$(host-csingle)) 67host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 68host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 69host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 70host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 71host-cshlib := $(addprefix $(obj)/,$(host-cshlib)) 72host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib)) 73host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs)) 74host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs)) 75host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 76 77obj-dirs += $(host-objdirs) 78 79##### 80# Handle options to gcc. Support building with separate output directory 81 82_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 83 $(HOSTCFLAGS_$(basetarget).o) 84_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 85 $(HOSTCXXFLAGS_$(basetarget).o) 86 87ifeq ($(KBUILD_SRC),) 88__hostc_flags = $(_hostc_flags) 89__hostcxx_flags = $(_hostcxx_flags) 90else 91__hostc_flags = -I$(obj) $(call flags,_hostc_flags) 92__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 93endif 94 95hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 96hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 97 98##### 99# Compile programs on the host 100 101# Create executable from a single .c file 102# host-csingle -> Executable 103quiet_cmd_host-csingle = HOSTCC $@ 104 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 105 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 106$(host-csingle): $(obj)/%: $(src)/%.c FORCE 107 $(call if_changed_dep,host-csingle) 108 109# Link an executable based on list of .o files, all plain c 110# host-cmulti -> executable 111quiet_cmd_host-cmulti = HOSTLD $@ 112 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 113 $(addprefix $(obj)/,$($(@F)-objs)) \ 114 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 115$(host-cmulti): FORCE 116 $(call if_changed,host-cmulti) 117$(call multi_depend, $(host-cmulti), , -objs) 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): $(obj)/%.o: $(src)/%.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): FORCE 134 $(call if_changed,host-cxxmulti) 135$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 136 137# Create .o file from a single .cc (C++) file 138quiet_cmd_host-cxxobjs = HOSTCXX $@ 139 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 140$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 141 $(call if_changed_dep,host-cxxobjs) 142 143# Compile .c file, create position independent .o file 144# host-cshobjs -> .o 145quiet_cmd_host-cshobjs = HOSTCC -fPIC $@ 146 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $< 147$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE 148 $(call if_changed_dep,host-cshobjs) 149 150# Compile .c file, create position independent .o file 151# Note that plugin capable gcc versions can be either C or C++ based 152# therefore plugin source files have to be compilable in both C and C++ mode. 153# This is why a C++ compiler is invoked on a .c file. 154# host-cxxshobjs -> .o 155quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@ 156 cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $< 157$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE 158 $(call if_changed_dep,host-cxxshobjs) 159 160# Link a shared library, based on position independent .o files 161# *.o -> .so shared library (host-cshlib) 162quiet_cmd_host-cshlib = HOSTLLD -shared $@ 163 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \ 164 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 165 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 166$(host-cshlib): FORCE 167 $(call if_changed,host-cshlib) 168$(call multi_depend, $(host-cshlib), .so, -objs) 169 170# Link a shared library, based on position independent .o files 171# *.o -> .so shared library (host-cxxshlib) 172quiet_cmd_host-cxxshlib = HOSTLLD -shared $@ 173 cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \ 174 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 175 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 176$(host-cxxshlib): FORCE 177 $(call if_changed,host-cxxshlib) 178$(call multi_depend, $(host-cxxshlib), .so, -objs) 179 180targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 181 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs) 182