1 # SPDX-License-Identifier: GPL-2.0 2 # ========================================================================== 3 # Building binaries on the host system 4 # Binaries are used during the compilation of the kernel, for example 5 # to preprocess a data file. 6 # 7 # Both C and C++ are supported, but preferred language is C for such utilities. 8 # 9 # Sample syntax (see Documentation/kbuild/makefiles.txt for reference) 10 # hostprogs-y := bin2hex 11 # Will compile bin2hex.c and create an executable named bin2hex 12 # 13 # hostprogs-y := lxdialog 14 # lxdialog-objs := checklist.o lxdialog.o 15 # Will compile lxdialog.c and checklist.c, and then link the executable 16 # lxdialog, based on checklist.o and lxdialog.o 17 # 18 # hostprogs-y := qconf 19 # qconf-cxxobjs := qconf.o 20 # qconf-objs := menu.o 21 # Will compile qconf as a C++ program, and menu as a C program. 22 # They are linked as C++ code to the executable qconf 23 24 __hostprogs := $(sort $(hostprogs-y) $(hostprogs-m)) 25 host-cshlib := $(sort $(hostlibs-y) $(hostlibs-m)) 26 host-cxxshlib := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m)) 27 28 # C code 29 # Executables compiled from a single .c file 30 host-csingle := $(foreach m,$(__hostprogs), \ 31 $(if $($(m)-objs)$($(m)-cxxobjs),,$(m))) 32 33 # C executables linked based on several .o files 34 host-cmulti := $(foreach m,$(__hostprogs),\ 35 $(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m)))) 36 37 # Object (.o) files compiled from .c files 38 host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs))) 39 40 # C++ code 41 # C++ executables compiled from at least one .cc file 42 # and zero or more .c files 43 host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m))) 44 45 # C++ Object (.o) files compiled from .cc files 46 host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs))) 47 48 # Object (.o) files used by the shared libaries 49 host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs)))) 50 host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs)))) 51 52 # output directory for programs/.o files 53 # hostprogs-y := tools/build may have been specified. 54 # Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation 55 host-objdirs := $(dir $(__hostprogs) $(host-cobjs) $(host-cxxobjs)) 56 57 host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs)))) 58 59 60 __hostprogs := $(addprefix $(obj)/,$(__hostprogs)) 61 host-csingle := $(addprefix $(obj)/,$(host-csingle)) 62 host-cmulti := $(addprefix $(obj)/,$(host-cmulti)) 63 host-cobjs := $(addprefix $(obj)/,$(host-cobjs)) 64 host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti)) 65 host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs)) 66 host-cshlib := $(addprefix $(obj)/,$(host-cshlib)) 67 host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib)) 68 host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs)) 69 host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs)) 70 host-objdirs := $(addprefix $(obj)/,$(host-objdirs)) 71 72 obj-dirs += $(host-objdirs) 73 74 ##### 75 # Handle options to gcc. Support building with separate output directory 76 77 _hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \ 78 $(HOSTCFLAGS_$(basetarget).o) 79 _hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \ 80 $(HOSTCXXFLAGS_$(basetarget).o) 81 82 ifeq ($(KBUILD_SRC),) 83 __hostc_flags = $(_hostc_flags) 84 __hostcxx_flags = $(_hostcxx_flags) 85 else 86 __hostc_flags = -I$(obj) $(call flags,_hostc_flags) 87 __hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags) 88 endif 89 90 hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags) 91 hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags) 92 93 ##### 94 # Compile programs on the host 95 96 # Create executable from a single .c file 97 # host-csingle -> Executable 98 quiet_cmd_host-csingle = HOSTCC $@ 99 cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \ 100 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 101 $(host-csingle): $(obj)/%: $(src)/%.c FORCE 102 $(call if_changed_dep,host-csingle) 103 104 # Link an executable based on list of .o files, all plain c 105 # host-cmulti -> executable 106 quiet_cmd_host-cmulti = HOSTLD $@ 107 cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \ 108 $(addprefix $(obj)/,$($(@F)-objs)) \ 109 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 110 $(host-cmulti): FORCE 111 $(call if_changed,host-cmulti) 112 $(call multi_depend, $(host-cmulti), , -objs) 113 114 # Create .o file from a single .c file 115 # host-cobjs -> .o 116 quiet_cmd_host-cobjs = HOSTCC $@ 117 cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $< 118 $(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE 119 $(call if_changed_dep,host-cobjs) 120 121 # Link an executable based on list of .o files, a mixture of .c and .cc 122 # host-cxxmulti -> executable 123 quiet_cmd_host-cxxmulti = HOSTLD $@ 124 cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \ 125 $(foreach o,objs cxxobjs,\ 126 $(addprefix $(obj)/,$($(@F)-$(o)))) \ 127 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 128 $(host-cxxmulti): FORCE 129 $(call if_changed,host-cxxmulti) 130 $(call multi_depend, $(host-cxxmulti), , -objs -cxxobjs) 131 132 # Create .o file from a single .cc (C++) file 133 quiet_cmd_host-cxxobjs = HOSTCXX $@ 134 cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $< 135 $(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE 136 $(call if_changed_dep,host-cxxobjs) 137 138 # Compile .c file, create position independent .o file 139 # host-cshobjs -> .o 140 quiet_cmd_host-cshobjs = HOSTCC -fPIC $@ 141 cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $< 142 $(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE 143 $(call if_changed_dep,host-cshobjs) 144 145 # Compile .c file, create position independent .o file 146 # Note that plugin capable gcc versions can be either C or C++ based 147 # therefore plugin source files have to be compilable in both C and C++ mode. 148 # This is why a C++ compiler is invoked on a .c file. 149 # host-cxxshobjs -> .o 150 quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@ 151 cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $< 152 $(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE 153 $(call if_changed_dep,host-cxxshobjs) 154 155 # Link a shared library, based on position independent .o files 156 # *.o -> .so shared library (host-cshlib) 157 quiet_cmd_host-cshlib = HOSTLLD -shared $@ 158 cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \ 159 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 160 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 161 $(host-cshlib): FORCE 162 $(call if_changed,host-cshlib) 163 $(call multi_depend, $(host-cshlib), .so, -objs) 164 165 # Link a shared library, based on position independent .o files 166 # *.o -> .so shared library (host-cxxshlib) 167 quiet_cmd_host-cxxshlib = HOSTLLD -shared $@ 168 cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \ 169 $(addprefix $(obj)/,$($(@F:.so=-objs))) \ 170 $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F)) 171 $(host-cxxshlib): FORCE 172 $(call if_changed,host-cxxshlib) 173 $(call multi_depend, $(host-cxxshlib), .so, -objs) 174 175 targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\ 176 $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs) 177