1 | # ==========================================================================
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2 | # Building
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3 | # ==========================================================================
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4 |
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5 | src := $(obj)
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6 |
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7 | PHONY := __build
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8 | __build:
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9 |
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10 | # Read .config if it exist, otherwise ignore
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11 | -include .config
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12 |
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13 | include scripts/Kbuild.include
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14 |
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15 | # The filename Kbuild has precedence over Makefile
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16 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
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17 | include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile)
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18 |
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19 | include scripts/Makefile.lib
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20 |
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21 | ifdef host-progs
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22 | ifneq ($(hostprogs-y),$(host-progs))
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23 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
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24 | hostprogs-y += $(host-progs)
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25 | endif
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26 | endif
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27 |
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28 | # Do not include host rules unles needed
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29 | ifneq ($(hostprogs-y)$(hostprogs-m),)
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30 | include scripts/Makefile.host
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31 | endif
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32 |
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33 | ifneq ($(KBUILD_SRC),)
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34 | # Create output directory if not already present
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35 | _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
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36 |
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37 | # Create directories for object files if directory does not exist
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38 | # Needed when obj-y := dir/file.o syntax is used
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39 | _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
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40 | endif
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41 |
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42 |
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43 | ifdef EXTRA_TARGETS
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44 | $(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
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45 | endif
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46 |
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47 | ifdef build-targets
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48 | $(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
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49 | endif
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50 |
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51 | ifdef export-objs
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52 | $(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
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53 | endif
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54 |
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55 | ifdef O_TARGET
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56 | $(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
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57 | endif
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58 |
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59 | ifdef L_TARGET
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60 | $(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
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61 | endif
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62 |
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63 | ifdef list-multi
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64 | $(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
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65 | endif
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66 |
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67 | ifndef obj
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68 | $(warning kbuild: Makefile.build is included improperly)
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69 | endif
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70 |
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71 | # ===========================================================================
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72 |
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73 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
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74 | lib-target := $(obj)/lib.a
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75 | endif
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76 |
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77 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
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78 | builtin-target := $(obj)/built-in.o
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79 | endif
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80 |
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81 | # We keep a list of all modules in $(MODVERDIR)
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82 |
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83 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
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84 | $(if $(KBUILD_MODULES),$(obj-m)) \
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85 | $(subdir-ym) $(always)
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86 | @:
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87 |
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88 | # Linus' kernel sanity checking tool
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89 | ifneq ($(KBUILD_CHECKSRC),0)
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90 | ifeq ($(KBUILD_CHECKSRC),2)
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91 | quiet_cmd_force_checksrc = CHECK $<
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92 | cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
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93 | else
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94 | quiet_cmd_checksrc = CHECK $<
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95 | cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
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96 | endif
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97 | endif
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98 |
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99 |
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100 | # Compile C sources (.c)
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101 | # ---------------------------------------------------------------------------
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102 |
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103 | # Default is built-in, unless we know otherwise
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104 | modkern_cflags := $(CFLAGS_KERNEL)
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105 | quiet_modtag := $(empty) $(empty)
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106 |
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107 | $(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
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108 | $(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
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109 | $(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
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110 | $(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
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111 |
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112 | $(real-objs-m) : quiet_modtag := [M]
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113 | $(real-objs-m:.o=.i) : quiet_modtag := [M]
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114 | $(real-objs-m:.o=.s) : quiet_modtag := [M]
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115 | $(real-objs-m:.o=.lst): quiet_modtag := [M]
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116 |
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117 | $(obj-m) : quiet_modtag := [M]
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118 |
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119 | # Default for not multi-part modules
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120 | modname = $(*F)
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121 |
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122 | $(multi-objs-m) : modname = $(modname-multi)
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123 | $(multi-objs-m:.o=.i) : modname = $(modname-multi)
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124 | $(multi-objs-m:.o=.s) : modname = $(modname-multi)
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125 | $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
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126 | $(multi-objs-y) : modname = $(modname-multi)
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127 | $(multi-objs-y:.o=.i) : modname = $(modname-multi)
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128 | $(multi-objs-y:.o=.s) : modname = $(modname-multi)
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129 | $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
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130 |
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131 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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132 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
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133 |
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134 | %.s: %.c FORCE
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135 | $(call if_changed_dep,cc_s_c)
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136 |
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137 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
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138 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
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139 |
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140 | %.i: %.c FORCE
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141 | $(call if_changed_dep,cc_i_c)
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142 |
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143 | # C (.c) files
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144 | # The C file is compiled and updated dependency information is generated.
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145 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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146 |
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147 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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148 |
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149 | ifndef CONFIG_MODVERSIONS
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150 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
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151 |
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152 | else
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153 | # When module versioning is enabled the following steps are executed:
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154 | # o compile a .tmp_<file>.o from <file>.c
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155 | # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
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156 | # not export symbols, we just rename .tmp_<file>.o to <file>.o and
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157 | # are done.
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158 | # o otherwise, we calculate symbol versions using the good old
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159 | # genksyms on the preprocessed source and postprocess them in a way
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160 | # that they are usable as a linker script
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161 | # o generate <file>.o from .tmp_<file>.o using the linker to
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162 | # replace the unresolved symbols __crc_exported_symbol with
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163 | # the actual value of the checksum generated by genksyms
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164 |
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165 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
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166 | cmd_modversions = \
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167 | if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
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168 | $(CPP) -D__GENKSYMS__ $(c_flags) $< \
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169 | | $(GENKSYMS) -a $(ARCH) \
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170 | > $(@D)/.tmp_$(@F:.o=.ver); \
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171 | \
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172 | $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
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173 | -T $(@D)/.tmp_$(@F:.o=.ver); \
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174 | rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
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175 | else \
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176 | mv -f $(@D)/.tmp_$(@F) $@; \
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177 | fi;
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178 | endif
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179 |
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180 | define rule_cc_o_c
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181 | $(call echo-cmd,checksrc) $(cmd_checksrc) \
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182 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
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183 | $(cmd_modversions) \
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184 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > $(@D)/.$(@F).tmp; \
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185 | rm -f $(depfile); \
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186 | mv -f $(@D)/.$(@F).tmp $(@D)/.$(@F).cmd
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187 | endef
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188 |
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189 | # Built-in and composite module parts
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190 |
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191 | %.o: %.c FORCE
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192 | $(call cmd,force_checksrc)
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193 | $(call if_changed_rule,cc_o_c)
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194 |
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195 | # Single-part modules are special since we need to mark them in $(MODVERDIR)
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196 |
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197 | $(single-used-m): %.o: %.c FORCE
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198 | $(call cmd,force_checksrc)
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199 | $(call if_changed_rule,cc_o_c)
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200 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
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201 |
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202 | quiet_cmd_cc_lst_c = MKLST $@
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203 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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204 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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205 | System.map $(OBJDUMP) > $@
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206 |
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207 | %.lst: %.c FORCE
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208 | $(call if_changed_dep,cc_lst_c)
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209 |
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210 | # Compile assembler sources (.S)
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211 | # ---------------------------------------------------------------------------
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212 |
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213 | modkern_aflags := $(AFLAGS_KERNEL)
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214 |
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215 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
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216 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
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217 |
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218 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
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219 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
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220 |
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221 | %.s: %.S FORCE
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222 | $(call if_changed_dep,as_s_S)
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223 |
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224 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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225 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
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226 |
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227 | %.o: %.S FORCE
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228 | $(call if_changed_dep,as_o_S)
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229 |
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230 | targets += $(real-objs-y) $(real-objs-m) $(lib-y)
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231 | targets += $(extra-y) $(MAKECMDGOALS) $(always)
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232 |
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233 | # Linker scripts preprocessor (.lds.S -> .lds)
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234 | # ---------------------------------------------------------------------------
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235 | quiet_cmd_cpp_lds_S = LDS $@
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236 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
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237 |
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238 | %.lds: %.lds.S FORCE
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239 | $(call if_changed_dep,cpp_lds_S)
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240 |
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241 | # Build the compiled-in targets
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242 | # ---------------------------------------------------------------------------
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243 |
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244 | # To build objects in subdirs, we need to descend into the directories
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245 | $(sort $(subdir-obj-y)): $(subdir-ym) ;
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246 |
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247 | #
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248 | # Rule to compile a set of .o files into one .o file
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249 | #
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250 | ifdef builtin-target
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251 | quiet_cmd_link_o_target = LD $@
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252 | # If the list of objects to link is empty, just create an empty built-in.o
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253 | cmd_link_o_target = $(if $(strip $(obj-y)),\
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254 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
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255 | rm -f $@; $(AR) rcs $@)
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256 |
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257 | $(builtin-target): $(obj-y) FORCE
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258 | $(call if_changed,link_o_target)
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259 |
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260 | targets += $(builtin-target)
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261 | endif # builtin-target
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262 |
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263 | #
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264 | # Rule to compile a set of .o files into one .a file
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265 | #
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266 | ifdef lib-target
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267 | quiet_cmd_link_l_target = AR $@
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268 | cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
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269 |
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270 | $(lib-target): $(lib-y) FORCE
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271 | $(call if_changed,link_l_target)
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272 |
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273 | targets += $(lib-target)
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274 | endif
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275 |
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276 | #
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277 | # Rule to link composite objects
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278 | #
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279 | # Composite objects are specified in kbuild makefile as follows:
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280 | # <composite-object>-objs := <list of .o files>
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281 | # or
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282 | # <composite-object>-y := <list of .o files>
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283 | link_multi_deps = \
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284 | $(filter $(addprefix $(obj)/, \
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285 | $($(subst $(obj)/,,$(@:.o=-objs))) \
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286 | $($(subst $(obj)/,,$(@:.o=-y)))), $^)
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287 |
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288 | quiet_cmd_link_multi-y = LD $@
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289 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
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290 |
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291 | quiet_cmd_link_multi-m = LD [M] $@
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292 | cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
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293 |
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294 | # We would rather have a list of rules like
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295 | # foo.o: $(foo-objs)
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296 | # but that's not so easy, so we rather make all composite objects depend
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297 | # on the set of all their parts
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298 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE
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299 | $(call if_changed,link_multi-y)
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300 |
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301 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE
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302 | $(call if_changed,link_multi-m)
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303 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
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304 |
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305 | targets += $(multi-used-y) $(multi-used-m)
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306 |
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307 |
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308 | # Descending
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309 | # ---------------------------------------------------------------------------
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310 |
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311 | PHONY += $(subdir-ym)
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312 | $(subdir-ym):
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313 | $(Q)$(MAKE) $(build)=$@
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314 |
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315 | # Add FORCE to the prequisites of a target to force it to be always rebuilt.
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316 | # ---------------------------------------------------------------------------
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317 |
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318 | PHONY += FORCE
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319 |
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320 | FORCE:
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321 |
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322 | # Read all saved command lines and dependencies for the $(targets) we
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323 | # may be building above, using $(if_changed{,_dep}). As an
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324 | # optimization, we don't need to read them if the target does not
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325 | # exist, we will rebuild anyway in that case.
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326 |
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327 | targets := $(wildcard $(sort $(targets)))
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328 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
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329 |
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330 | ifneq ($(cmd_files),)
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331 | include $(cmd_files)
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332 | endif
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333 |
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334 |
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335 | # Declare the contents of the .PHONY variable as phony. We keep that
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336 | # information in a variable se we can use it in if_changed and friends.
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337 |
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338 | .PHONY: $(PHONY)
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