Rules.make

   1 #
   2 # This file contains rules which are shared between multiple Makefiles.
   3 #
   4
   5 #
   6 # False targets.
   7 #
   8 .PHONY: dummy
   9
  10 #
  11 # Special variables which should not be exported
  12 #
  13 unexport EXTRA_ASFLAGS
  14 unexport EXTRA_CFLAGS
  15 unexport EXTRA_LDFLAGS
  16 unexport EXTRA_ARFLAGS
  17 unexport SUBDIRS
  18 unexport SUB_DIRS
  19 unexport ALL_SUB_DIRS
  20 unexport MOD_SUB_DIRS
  21 unexport O_TARGET
  22 unexport O_OBJS
  23 unexport L_OBJS
  24 unexport M_OBJS
  25 # intermediate objects that form part of a module
  26 unexport MI_OBJS
  27 unexport ALL_MOBJS
  28 # objects that export symbol tables
  29 unexport OX_OBJS
  30 unexport LX_OBJS
  31 unexport MX_OBJS
  32 unexport MIX_OBJS
  33 unexport SYMTAB_OBJS
  34
  35 unexport MOD_LIST_NAME
  36
  37 #
  38 # Get things started.
  39 #
  40 first_rule: sub_dirs
  41         $(MAKE) all_targets
  42
  43 #
  44 # Common rules
  45 #
  46
  47 %.s: %.c
  48         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -S $< -o $@
  49
  50 %.i: %.c
  51         $(CPP) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) $< > $@
  52
  53 %.o: %.c
  54         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -c -o $@ $<
  55         @ ( \
  56             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@))),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@))))' ; \
  57             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
  58             echo 'endif' \
  59         ) > $(dir $@)/.$(notdir $@).flags
  60
  61 %.o: %.s
  62         $(AS) $(ASFLAGS) $(EXTRA_CFLAGS) -o $@ $<
  63
  64 #
  65 #
  66 #
  67 all_targets: $(O_TARGET) $(L_TARGET)
  68
  69 #
  70 # Rule to compile a set of .o files into one .o file
  71 #
  72 ifdef O_TARGET
  73 ALL_O = $(OX_OBJS) $(O_OBJS)
  74 $(O_TARGET): $(ALL_O)
  75         rm -f $@
  76     ifneq "$(strip $(ALL_O))" ""
  77         $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(ALL_O), $^)
  78     else
  79         $(AR) rcs $@ $(filter $(ALL_O), $^)
  80     endif
  81         @ ( \
  82             echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_LDFLAGS) $(ALL_O))),$$(strip $$(subst $$(comma),:,$$(EXTRA_LDFLAGS) $$(ALL_O))))' ; \
  83             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
  84             echo 'endif' \
  85         ) > $(dir $@)/.$(notdir $@).flags
  86 endif # O_TARGET
  87
  88 #
  89 # Rule to compile a set of .o files into one .a file
  90 #
  91 ifdef L_TARGET
  92 $(L_TARGET): $(LX_OBJS) $(L_OBJS)
  93         rm -f $@
  94         $(AR) $(EXTRA_ARFLAGS) rcs $@ $(LX_OBJS) $(L_OBJS)
  95         @ ( \
  96             echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(LX_OBJS) $(L_OBJS))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(LX_OBJS) $$(L_OBJS))))' ; \
  97             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
  98             echo 'endif' \
  99         ) > $(dir $@)/.$(notdir $@).flags
 100 endif
 101
 102 #
 103 # This make dependencies quickly
 104 #
 105 fastdep: dummy
 106         $(TOPDIR)/scripts/mkdep $(wildcard *.[chS] local.h.master) > .depend
 107 ifdef ALL_SUB_DIRS
 108         $(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
 109 endif
 110
 111 ifdef _FASTDEP_ALL_SUB_DIRS
 112 $(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
 113         $(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
 114 endif
 115
 116
 117 #
 118 # A rule to make subdirectories
 119 #
 120 sub_dirs: dummy $(patsubst %,_subdir_%,$(SUB_DIRS))
 121
 122 ifdef SUB_DIRS
 123 $(patsubst %,_subdir_%,$(SUB_DIRS)) : dummy
 124         $(MAKE) -C $(patsubst _subdir_%,%,$@)
 125 endif
 126
 127 #
 128 # A rule to make modules
 129 #
 130 ALL_MOBJS = $(MX_OBJS) $(M_OBJS)
 131 ifneq "$(strip $(ALL_MOBJS))" ""
 132 PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 133 endif
 134
 135 ifdef MOD_SUB_DIRS
 136 $(patsubst %,_modsubdir_%,$(MOD_SUB_DIRS)) : dummy
 137         $(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules
 138 endif
 139
 140 ifdef MOD_IN_SUB_DIRS
 141 $(patsubst %,_modinsubdir_%,$(MOD_IN_SUB_DIRS)) : dummy
 142         $(MAKE) -C $(patsubst _modinsubdir_%,%,$@) modules
 143 endif
 144
 145 modules: $(ALL_MOBJS) $(MIX_OBJS) $(MI_OBJS) dummy \
 146          $(patsubst %,_modsubdir_%,$(MOD_SUB_DIRS)) \
 147          $(patsubst %,_modinsubdir_%,$(MOD_IN_SUB_DIRS))
 148 ifneq "$(strip $(MOD_LIST_NAME))" ""
 149         rm -f $$TOPDIR/modules/$(MOD_LIST_NAME)
 150 ifdef MOD_SUB_DIRS
 151         for i in $(MOD_SUB_DIRS); do \
 152             echo `basename $$i`.o >> $$TOPDIR/modules/$(MOD_LIST_NAME); done
 153 endif
 154 ifneq "$(strip $(ALL_MOBJS))" ""
 155         echo $(ALL_MOBJS) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 156 endif
 157 ifneq "$(strip $(MOD_TO_LIST))" ""
 158         echo $(MOD_TO_LIST) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
 159 endif
 160 endif
 161 ifneq "$(strip $(ALL_MOBJS))" ""
 162         echo $(PDWN)
 163         cd $$TOPDIR/modules; for i in $(ALL_MOBJS); do \
 164             ln -sf ../$(PDWN)/$$i $$i; done
 165 endif
 166
 167 #
 168 # A rule to do nothing
 169 #
 170 dummy:
 171
 172 #
 173 # This is useful for testing
 174 #
 175 script:
 176         $(SCRIPT)
 177
 178 #
 179 # This sets version suffixes on exported symbols
 180 # Uses SYMTAB_OBJS
 181 # Separate the object into "normal" objects and "exporting" objects
 182 # Exporting objects are: all objects that define symbol tables
 183 #
 184 ifdef CONFIG_MODULES
 185
 186 SYMTAB_OBJS = $(LX_OBJS) $(OX_OBJS) $(MX_OBJS) $(MIX_OBJS)
 187
 188 ifdef CONFIG_MODVERSIONS
 189 ifneq "$(strip $(SYMTAB_OBJS))" ""
 190
 191 MODINCL = $(TOPDIR)/include/linux/modules
 192
 193 # The -w option (enable warnings) for genksyms will return here in 2.1
 194 # So where has it gone?
 195 #
 196 # Added the SMP separator to stop module accidents between uniprocessor
 197 # and SMP Intel boxes - AC - from bits by Michael Chastain
 198 #
 199
 200 ifdef CONFIG_SMP
 201         genksyms_smp_prefix := -p smp_
 202 else
 203         genksyms_smp_prefix :=
 204 endif
 205
 206 $(MODINCL)/%.ver: %.c
 207         @if [ ! -r $(MODINCL)/$*.stamp -o $(MODINCL)/$*.stamp -ot $< ]; then \
 208                 echo '$(CC) $(CFLAGS) -E -D__GENKSYMS__ $<'; \
 209                 echo '| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
 210                 $(CC) $(CFLAGS) -E -D__GENKSYMS__ $< \
 211                 | $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp; \
 212                 if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
 213                 else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
 214         fi; touch $(MODINCL)/$*.stamp
 215
 216 $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 217
 218 $(TOPDIR)/include/linux/modversions.h: $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver))
 219         @echo updating $(TOPDIR)/include/linux/modversions.h
 220         @(echo "#ifndef _LINUX_MODVERSIONS_H";\
 221           echo "#define _LINUX_MODVERSIONS_H"; \
 222           echo "#include <linux/modsetver.h>"; \
 223           cd $(TOPDIR)/include/linux/modules; \
 224           for f in *.ver; do \
 225             if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 226           done; \
 227           echo "#endif"; \
 228         ) > $@
 229
 230 dep fastdep: $(TOPDIR)/include/linux/modversions.h
 231
 232 endif # SYMTAB_OBJS
 233
 234 $(M_OBJS): $(TOPDIR)/include/linux/modversions.h
 235 ifdef MAKING_MODULES
 236 $(O_OBJS) $(L_OBJS): $(TOPDIR)/include/linux/modversions.h
 237 endif
 238
 239 else
 240
 241 $(TOPDIR)/include/linux/modversions.h:
 242         @echo "#include <linux/modsetver.h>" > $@
 243
 244 endif # CONFIG_MODVERSIONS
 245
 246 ifneq "$(strip $(SYMTAB_OBJS))" ""
 247 $(SYMTAB_OBJS): $(SYMTAB_OBJS:.o=.c) $(TOPDIR)/include/linux/modversions.h
 248         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
 249         @ ( \
 250             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
 251             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 252             echo 'endif' \
 253         ) > $(dir $@)/.$(notdir $@).flags
 254 endif
 255
 256 endif # CONFIG_MODULES
 257
 258
 259 #
 260 # include dependency files if they exist
 261 #
 262 ifneq ($(wildcard .depend),)
 263 include .depend
 264 endif
 265
 266 ifneq ($(wildcard $(TOPDIR)/.hdepend),)
 267 include $(TOPDIR)/.hdepend
 268 endif
 269
 270 #
 271 # Find files whose flags have changed and force recompilation.
 272 # For safety, this works in the converse direction:
 273 #   every file is forced, except those whose flags are positively up-to-date.
 274 #
 275 FILES_FLAGS_UP_TO_DATE :=
 276
 277 # For use in expunging commas from flags, which mung our checking.
 278 comma = ,
 279
 280 FILES_FLAGS_EXIST := $(wildcard .*.flags)
 281 ifneq ($(FILES_FLAGS_EXIST),)
 282 include $(FILES_FLAGS_EXIST)
 283 endif
 284
 285 FILES_FLAGS_CHANGED := $(strip \
 286     $(filter-out $(FILES_FLAGS_UP_TO_DATE), \
 287         $(O_TARGET) $(O_OBJS) $(OX_OBJS) \
 288         $(L_TARGET) $(L_OBJS) $(LX_OBJS) \
 289         $(M_OBJS) $(MX_OBJS) \
 290         $(MI_OBJS) $(MIX_OBJS) \
 291         ))
 292
 293 # A kludge: .S files don't get flag dependencies (yet),
 294 #   because that will involve changing a lot of Makefiles.
 295 FILES_FLAGS_CHANGED := $(strip \
 296     $(filter-out $(patsubst %.S, %.o, $(wildcard *.S)), \
 297     $(FILES_FLAGS_CHANGED)))
 298
 299 ifneq ($(FILES_FLAGS_CHANGED),)
 300 $(FILES_FLAGS_CHANGED): dummy
 301 endif