1 | # Backward compatibility - to be removed...
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2 | extra-y += $(EXTRA_TARGETS)
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3 | # Figure out what we need to build from the various variables
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4 | # ===========================================================================
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5 |
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6 | # When an object is listed to be built compiled-in and modular,
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7 | # only build the compiled-in version
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8 |
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9 | obj-m := $(filter-out $(obj-y),$(obj-m))
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10 |
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11 | # Libraries are always collected in one lib file.
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12 | # Filter out objects already built-in
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13 |
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14 | lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
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15 |
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16 |
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17 | # Handle objects in subdirs
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18 | # ---------------------------------------------------------------------------
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19 | # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
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20 | # and add the directory to the list of dirs to descend into: $(subdir-y)
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21 | # o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
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22 | # and add the directory to the list of dirs to descend into: $(subdir-m)
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23 |
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24 | __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
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25 | subdir-y += $(__subdir-y)
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26 | __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
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27 | subdir-m += $(__subdir-m)
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28 | obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
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29 | obj-m := $(filter-out %/, $(obj-m))
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30 |
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31 | # Subdirectories we need to descend into
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32 |
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33 | subdir-ym := $(sort $(subdir-y) $(subdir-m))
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34 |
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35 | # if $(foo-objs) exists, foo.o is a composite object
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36 | multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
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37 | multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
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38 | multi-used := $(multi-used-y) $(multi-used-m)
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39 | single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
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40 |
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41 | # Build list of the parts of our composite objects, our composite
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42 | # objects depend on those (obviously)
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43 | multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
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44 | multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
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45 | multi-objs := $(multi-objs-y) $(multi-objs-m)
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46 |
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47 | # $(subdir-obj-y) is the list of objects in $(obj-y) which do not live
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48 | # in the local directory
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49 | subdir-obj-y := $(foreach o,$(obj-y),$(if $(filter-out $(o),$(notdir $(o))),$(o)))
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50 |
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51 | # $(obj-dirs) is a list of directories that contain object files
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52 | obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
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53 |
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54 | # Replace multi-part objects by their individual parts, look at local dir only
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55 | real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
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56 | real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
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57 |
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58 | # Add subdir path
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59 |
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60 | extra-y := $(addprefix $(obj)/,$(extra-y))
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61 | always := $(addprefix $(obj)/,$(always))
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62 | targets := $(addprefix $(obj)/,$(targets))
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63 | obj-y := $(addprefix $(obj)/,$(obj-y))
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64 | obj-m := $(addprefix $(obj)/,$(obj-m))
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65 | lib-y := $(addprefix $(obj)/,$(lib-y))
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66 | subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
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67 | real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
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68 | real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
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69 | single-used-m := $(addprefix $(obj)/,$(single-used-m))
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70 | multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
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71 | multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
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72 | multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
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73 | multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
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74 | subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
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75 | obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
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76 |
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77 | # These flags are needed for modversions and compiling, so we define them here
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78 | # already
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79 | # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
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80 | # end up in (or would, if it gets compiled in)
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81 | # Note: It's possible that one object gets potentially linked into more
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82 | # than one module. In that case KBUILD_MODNAME will be set to foo_bar,
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83 | # where foo and bar are the name of the modules.
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84 | name-fix = $(subst $(comma),_,$(subst -,_,$1))
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85 | basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(*F)))"
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86 | modname_flags = $(if $(filter 1,$(words $(modname))),\
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87 | -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
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88 |
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89 | _c_flags = $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$(*F).o)
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90 | _a_flags = $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$(*F).o)
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91 | _cpp_flags = $(CPPFLAGS) $(EXTRA_CPPFLAGS) $(CPPFLAGS_$(@F))
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92 |
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93 | # If building the kernel in a separate objtree expand all occurrences
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94 | # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
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95 |
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96 | ifeq ($(KBUILD_SRC),)
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97 | __c_flags = $(_c_flags)
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98 | __a_flags = $(_a_flags)
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99 | __cpp_flags = $(_cpp_flags)
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100 | else
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101 |
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102 | # -I$(obj) locates generated .h files
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103 | # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
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104 | # and locates generated .h files
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105 | # FIXME: Replace both with specific CFLAGS* statements in the makefiles
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106 | __c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags)
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107 | __a_flags = $(call flags,_a_flags)
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108 | __cpp_flags = $(call flags,_cpp_flags)
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109 | endif
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110 |
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111 | c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
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112 | $(__c_flags) $(modkern_cflags) \
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113 | -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
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114 |
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115 | a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(CPPFLAGS) \
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116 | $(__a_flags) $(modkern_aflags)
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117 |
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118 | cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
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119 |
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120 | ld_flags = $(LDFLAGS) $(EXTRA_LDFLAGS)
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121 |
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122 | # Finds the multi-part object the current object will be linked into
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123 | modname-multi = $(sort $(foreach m,$(multi-used),\
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124 | $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
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125 |
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126 | # Shipped files
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127 | # ===========================================================================
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128 |
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129 | quiet_cmd_shipped = SHIPPED $@
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130 | cmd_shipped = cat $< > $@
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131 |
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132 | $(obj)/%:: $(src)/%_shipped
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133 | $(call cmd,shipped)
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134 |
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135 | # Commands useful for building a boot image
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136 | # ===========================================================================
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137 | #
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138 | # Use as following:
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139 | #
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140 | # target: source(s) FORCE
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141 | # $(if_changed,ld/objcopy/gzip)
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142 | #
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143 | # and add target to EXTRA_TARGETS so that we know we have to
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144 | # read in the saved command line
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145 |
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146 | # Linking
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147 | # ---------------------------------------------------------------------------
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148 |
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149 | quiet_cmd_ld = LD $@
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150 | cmd_ld = $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) $(LDFLAGS_$(@F)) \
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151 | $(filter-out FORCE,$^) -o $@
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152 |
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153 | # Objcopy
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154 | # ---------------------------------------------------------------------------
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155 |
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156 | quiet_cmd_objcopy = OBJCOPY $@
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157 | cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
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158 |
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159 | # Gzip
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160 | # ---------------------------------------------------------------------------
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161 |
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162 | quiet_cmd_gzip = GZIP $@
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163 | cmd_gzip = gzip -f -9 < $< > $@
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164 |
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165 |
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