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 := $(sort $(hostprogs-y) $(hostprogs-m)) 24 25# C code 26# Executables compiled from a single .c file 27host-csingle := $(foreach m,$(__hostprogs), \ 28 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) 29 30# C executables linked based on several .o files 31host-cmulti := $(foreach m,$(__hostprogs),\ 32 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 33 34# Object (.o) files compiled from .c files 35host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 36 37# C++ code 38# C++ executables compiled from at least one .cc file 39# and zero or more .c files 40host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 41 42# C++ Object (.o) files compiled from .cc files 43host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 44 45# output directory for programs/.o files 46# hostprogs-y := tools/build may have been specified. 47# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation 48host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs)) 49 50host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 51 52 53__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 54host-csingle := $(addprefix $(obj)/,$(host-csingle)) 55host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 56host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 57host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 58host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 59host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 60 61obj-dirs += $(host-objdirs) 62 63##### 64# Handle options to gcc. Support building with separate output directory 65 66_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 67 $(HOSTCFLAGS_$(basetarget).o) 68_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 69 $(HOSTCXXFLAGS_$(basetarget).o) 70 71ifeq ($(KBUILD_SRC),) 72__hostc_flags = $(_hostc_flags) 73__hostcxx_flags = $(_hostcxx_flags) 74else 75__hostc_flags = -I$(obj) $(call flags,_hostc_flags) 76__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 77endif 78 79hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 80hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 81 82##### 83# Compile programs on the host 84 85# Create executable from a single .c file 86# host-csingle -> Executable 87quiet_cmd_host-csingle = HOSTCC $@ 88 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 89 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 90$(host-csingle): $(obj)/%: $(src)/%.c FORCE 91 $(call if_changed_dep,host-csingle) 92 93# Link an executable based on list of .o files, all plain c 94# host-cmulti -> executable 95quiet_cmd_host-cmulti = HOSTLD $@ 96 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 97 $(addprefix $(obj)/,$($(@F)-objs)) \ 98 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 99$(host-cmulti): FORCE 100 $(call if_changed,host-cmulti) 101$(call multi_depend, $(host-cmulti), , -objs) 102 103# Create .o file from a single .c file 104# host-cobjs -> .o 105quiet_cmd_host-cobjs = HOSTCC $@ 106 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 107$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 108 $(call if_changed_dep,host-cobjs) 109 110# Link an executable based on list of .o files, a mixture of .c and .cc 111# host-cxxmulti -> executable 112quiet_cmd_host-cxxmulti = HOSTLD $@ 113 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ 114 $(foreach o,objs cxxobjs,\ 115 $(addprefix $(obj)/,$($(@F)-$(o)))) \ 116 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 117$(host-cxxmulti): FORCE 118 $(call if_changed,host-cxxmulti) 119$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 120 121# Create .o file from a single .cc (C++) file 122quiet_cmd_host-cxxobjs = HOSTCXX $@ 123 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 124$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 125 $(call if_changed_dep,host-cxxobjs) 126 127targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 128 $(host-cxxmulti) $(host-cxxobjs) 129