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)) 24host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m)) 25host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m)) 26 27# C code 28# Executables compiled from a single .c file 29host-csingle := $(foreach m,$(__hostprogs), \ 30 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) 31 32# C executables linked based on several .o files 33host-cmulti := $(foreach m,$(__hostprogs),\ 34 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 35 36# Object (.o) files compiled from .c files 37host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 38 39# C++ code 40# C++ executables compiled from at least one .cc file 41# and zero or more .c files 42host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 43 44# C++ Object (.o) files compiled from .cc files 45host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 46 47# Object (.o) files used by the shared libaries 48host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs)))) 49host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs)))) 50 51# output directory for programs/.o files 52# hostprogs-y := tools/build may have been specified. 53# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation 54host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs)) 55 56host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 57 58 59__hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 60host-csingle := $(addprefix $(obj)/,$(host-csingle)) 61host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 62host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 63host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 64host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 65host-cshlib := $(addprefix $(obj)/,$(host-cshlib)) 66host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib)) 67host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs)) 68host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs)) 69host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 70 71obj-dirs += $(host-objdirs) 72 73##### 74# Handle options to gcc. Support building with separate output directory 75 76_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 77 $(HOSTCFLAGS_$(basetarget).o) 78_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 79 $(HOSTCXXFLAGS_$(basetarget).o) 80 81ifeq ($(KBUILD_SRC),) 82__hostc_flags = $(_hostc_flags) 83__hostcxx_flags = $(_hostcxx_flags) 84else 85__hostc_flags = -I$(obj) $(call flags,_hostc_flags) 86__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 87endif 88 89hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 90hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 91 92##### 93# Compile programs on the host 94 95# Create executable from a single .c file 96# host-csingle -> Executable 97quiet_cmd_host-csingle = HOSTCC $@ 98 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 99 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 100$(host-csingle): $(obj)/%: $(src)/%.c FORCE 101 $(call if_changed_dep,host-csingle) 102 103# Link an executable based on list of .o files, all plain c 104# host-cmulti -> executable 105quiet_cmd_host-cmulti = HOSTLD $@ 106 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 107 $(addprefix $(obj)/,$($(@F)-objs)) \ 108 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 109$(host-cmulti): FORCE 110 $(call if_changed,host-cmulti) 111$(call multi_depend, $(host-cmulti), , -objs) 112 113# Create .o file from a single .c file 114# host-cobjs -> .o 115quiet_cmd_host-cobjs = HOSTCC $@ 116 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 117$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 118 $(call if_changed_dep,host-cobjs) 119 120# Link an executable based on list of .o files, a mixture of .c and .cc 121# host-cxxmulti -> executable 122quiet_cmd_host-cxxmulti = HOSTLD $@ 123 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ 124 $(foreach o,objs cxxobjs,\ 125 $(addprefix $(obj)/,$($(@F)-$(o)))) \ 126 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 127$(host-cxxmulti): FORCE 128 $(call if_changed,host-cxxmulti) 129$(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 130 131# Create .o file from a single .cc (C++) file 132quiet_cmd_host-cxxobjs = HOSTCXX $@ 133 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 134$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 135 $(call if_changed_dep,host-cxxobjs) 136 137# Compile .c file, create position independent .o file 138# host-cshobjs -> .o 139quiet_cmd_host-cshobjs = HOSTCC -fPIC $@ 140 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $< 141$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE 142 $(call if_changed_dep,host-cshobjs) 143 144# Compile .c file, create position independent .o file 145# Note that plugin capable gcc versions can be either C or C++ based 146# therefore plugin source files have to be compilable in both C and C++ mode. 147# This is why a C++ compiler is invoked on a .c file. 148# host-cxxshobjs -> .o 149quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@ 150 cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $< 151$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE 152 $(call if_changed_dep,host-cxxshobjs) 153 154# Link a shared library, based on position independent .o files 155# *.o -> .so shared library (host-cshlib) 156quiet_cmd_host-cshlib = HOSTLLD -shared $@ 157 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \ 158 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 159 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 160$(host-cshlib): FORCE 161 $(call if_changed,host-cshlib) 162$(call multi_depend, $(host-cshlib), .so, -objs) 163 164# Link a shared library, based on position independent .o files 165# *.o -> .so shared library (host-cxxshlib) 166quiet_cmd_host-cxxshlib = HOSTLLD -shared $@ 167 cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \ 168 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 169 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 170$(host-cxxshlib): FORCE 171 $(call if_changed,host-cxxshlib) 172$(call multi_depend, $(host-cxxshlib), .so, -objs) 173 174targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 175 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs) 176