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