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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