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_AFLAGS
  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 #
  36 # Get things started.
  37 #
  38 first_rule: sub_dirs
  39         $(MAKE) all_targets
  40
  41 #
  42 # Common rules
  43 #
  44
  45 %.s: %.c
  46         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -S $< -o $@
  47
  48 %.i: %.c
  49         $(CPP) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) $< > $@
  50
  51 %.o: %.c
  52         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -c -o $@ $<
  53         @ ( \
  54             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@))),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@))))' ; \
  55             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
  56             echo 'endif' \
  57         ) > $(dir $@)/.$(notdir $@).flags
  58
  59 %.o: %.s
  60         $(AS) $(AFLAGS) $(EXTRA_CFLAGS) -o $@ $<
  61
  62 # Old makefiles define their own rules for compiling .S files,
  63 # but these standard rules are available for any Makefile that
  64 # wants to use them.  Our plan is to incrementally convert all
  65 # the Makefiles to these standard rules.  -- rmk, mec
  66 ifdef USE_STANDARD_AS_RULE
  67
  68 %.s: %.S
  69         $(CPP) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) $< > $@
  70
  71 %.o: %.S
  72         $(CC) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) -c -o $@ $<
  73
  74 endif
  75
  76 %.lst: %.c
  77         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -g -c -o $*.o $<
  78         $(TOPDIR)/scripts/makelst $* $(TOPDIR) $(OBJDUMP)
  79 #
  80 #
  81 #
  82 all_targets: $(O_TARGET) $(L_TARGET)
  83
  84 #
  85 # Rule to compile a set of .o files into one .o file
  86 #
  87 ifdef O_TARGET
  88 ALL_O = $(OX_OBJS) $(O_OBJS)
  89 $(O_TARGET): $(ALL_O)
  90         rm -f $@
  91     ifneq "$(strip $(ALL_O))" ""
  92         $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(ALL_O), $^)
  93     else
  94         $(AR) rcs $@ $(filter $(ALL_O), $^)
  95     endif
  96         @ ( \
  97             echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_LDFLAGS) $(ALL_O))),$$(strip $$(subst $$(comma),:,$$(EXTRA_LDFLAGS) $$(ALL_O))))' ; \
  98             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
  99             echo 'endif' \
 100         ) > $(dir $@)/.$(notdir $@).flags
 101 endif # O_TARGET
 102
 103 #
 104 # Rule to compile a set of .o files into one .a file
 105 #
 106 ifdef L_TARGET
 107 $(L_TARGET): $(LX_OBJS) $(L_OBJS)
 108         rm -f $@
 109         $(AR) $(EXTRA_ARFLAGS) rcs $@ $(LX_OBJS) $(L_OBJS)
 110         @ ( \
 111             echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(LX_OBJS) $(L_OBJS))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(LX_OBJS) $$(L_OBJS))))' ; \
 112             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 113             echo 'endif' \
 114         ) > $(dir $@)/.$(notdir $@).flags
 115 endif
 116
 117 #
 118 # This make dependencies quickly
 119 #
 120 fastdep: dummy
 121         $(TOPDIR)/scripts/mkdep $(wildcard *.[chS] local.h.master) > .depend
 122 ifdef ALL_SUB_DIRS
 123         $(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
 124 endif
 125
 126 ifdef _FASTDEP_ALL_SUB_DIRS
 127 $(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
 128         $(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
 129 endif
 130
 131
 132 #
 133 # A rule to make subdirectories
 134 #
 135 sub_dirs: dummy $(patsubst %,_subdir_%,$(SUB_DIRS))
 136
 137 ifdef SUB_DIRS
 138 $(patsubst %,_subdir_%,$(SUB_DIRS)) : dummy
 139         $(MAKE) -C $(patsubst _subdir_%,%,$@)
 140 endif
 141
 142 #
 143 # A rule to make modules
 144 #
 145 ALL_MOBJS = $(MX_OBJS) $(M_OBJS)
 146 ifneq "$(strip $(ALL_MOBJS))" ""
 147 PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 148 endif
 149
 150 unexport MOD_DIRS
 151 MOD_DIRS := $(MOD_SUB_DIRS) $(MOD_IN_SUB_DIRS)
 152 ifneq "$(strip $(MOD_DIRS))" ""
 153 .PHONY: $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 154 $(patsubst %,_modsubdir_%,$(MOD_DIRS)) : dummy
 155         $(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules
 156
 157 .PHONY: $(patsubst %,_modinst_%,$(MOD_DIRS))
 158 $(patsubst %,_modinst_%,$(MOD_DIRS)) : dummy
 159         $(MAKE) -C $(patsubst _modinst_%,%,$@) modules_install
 160 endif
 161
 162 .PHONY: modules
 163 modules: $(ALL_MOBJS) $(MIX_OBJS) $(MI_OBJS) dummy \
 164          $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 165
 166 .PHONY: _modinst__
 167 _modinst__: dummy
 168 ifneq "$(strip $(ALL_MOBJS))" ""
 169         mkdir -p $(MODLIB)/kernel/$(PDWN)
 170         cp $(ALL_MOBJS) $(MODLIB)/kernel/$(PDWN)
 171 endif
 172
 173 .PHONY: modules_install
 174 modules_install: _modinst__ \
 175          $(patsubst %,_modinst_%,$(MOD_DIRS))
 176
 177 #
 178 # A rule to do nothing
 179 #
 180 dummy:
 181
 182 #
 183 # This is useful for testing
 184 #
 185 script:
 186         $(SCRIPT)
 187
 188 #
 189 # This sets version suffixes on exported symbols
 190 # Uses SYMTAB_OBJS
 191 # Separate the object into "normal" objects and "exporting" objects
 192 # Exporting objects are: all objects that define symbol tables
 193 #
 194 ifdef CONFIG_MODULES
 195
 196 SYMTAB_OBJS = $(LX_OBJS) $(OX_OBJS) $(MX_OBJS) $(MIX_OBJS)
 197
 198 ifdef CONFIG_MODVERSIONS
 199 ifneq "$(strip $(SYMTAB_OBJS))" ""
 200
 201 MODINCL = $(TOPDIR)/include/linux/modules
 202
 203 # The -w option (enable warnings) for genksyms will return here in 2.1
 204 # So where has it gone?
 205 #
 206 # Added the SMP separator to stop module accidents between uniprocessor
 207 # and SMP Intel boxes - AC - from bits by Michael Chastain
 208 #
 209
 210 ifdef CONFIG_SMP
 211         genksyms_smp_prefix := -p smp_
 212 else
 213         genksyms_smp_prefix :=
 214 endif
 215
 216 $(MODINCL)/%.ver: %.c
 217         @if [ ! -r $(MODINCL)/$*.stamp -o $(MODINCL)/$*.stamp -ot $< ]; then \
 218                 echo '$(CC) $(CFLAGS) -E -D__GENKSYMS__ $<'; \
 219                 echo '| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
 220                 $(CC) $(CFLAGS) -E -D__GENKSYMS__ $< \
 221                 | $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp; \
 222                 if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
 223                 else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
 224         fi; touch $(MODINCL)/$*.stamp
 225
 226 $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 227
 228 # updates .ver files but not modversions.h
 229 fastdep: $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver))
 230
 231 # updates .ver files and modversions.h like before (is this needed?)
 232 dep: fastdep update-modverfile
 233
 234 endif # SYMTAB_OBJS
 235
 236 # update modversions.h, but only if it would change
 237 update-modverfile:
 238         @(echo "#ifndef _LINUX_MODVERSIONS_H";\
 239           echo "#define _LINUX_MODVERSIONS_H"; \
 240           echo "#include <linux/modsetver.h>"; \
 241           cd $(TOPDIR)/include/linux/modules; \
 242           for f in *.ver; do \
 243             if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 244           done; \
 245           echo "#endif"; \
 246         ) > $(TOPDIR)/include/linux/modversions.h.tmp
 247         @if [ -r $(TOPDIR)/include/linux/modversions.h ] && cmp -s $(TOPDIR)/include/linux/modversions.h $(TOPDIR)/include/linux/modversions.h.tmp; then \
 248                 echo $(TOPDIR)/include/linux/modversions.h was not updated; \
 249                 rm -f $(TOPDIR)/include/linux/modversions.h.tmp; \
 250         else \
 251                 echo $(TOPDIR)/include/linux/modversions.h was updated; \
 252                 mv -f $(TOPDIR)/include/linux/modversions.h.tmp $(TOPDIR)/include/linux/modversions.h; \
 253         fi
 254
 255 $(M_OBJS): $(TOPDIR)/include/linux/modversions.h
 256 ifdef MAKING_MODULES
 257 $(O_OBJS) $(L_OBJS): $(TOPDIR)/include/linux/modversions.h
 258 endif
 259
 260 else
 261
 262 $(TOPDIR)/include/linux/modversions.h:
 263         @echo "#include <linux/modsetver.h>" > $@
 264
 265 endif # CONFIG_MODVERSIONS
 266
 267 ifneq "$(strip $(SYMTAB_OBJS))" ""
 268 $(SYMTAB_OBJS): $(SYMTAB_OBJS:.o=.c) $(TOPDIR)/include/linux/modversions.h
 269         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
 270         @ ( \
 271             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
 272             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 273             echo 'endif' \
 274         ) > $(dir $@)/.$(notdir $@).flags
 275 endif
 276
 277 endif # CONFIG_MODULES
 278
 279
 280 #
 281 # include dependency files if they exist
 282 #
 283 ifneq ($(wildcard .depend),)
 284 include .depend
 285 endif
 286
 287 ifneq ($(wildcard $(TOPDIR)/.hdepend),)
 288 include $(TOPDIR)/.hdepend
 289 endif
 290
 291 #
 292 # Find files whose flags have changed and force recompilation.
 293 # For safety, this works in the converse direction:
 294 #   every file is forced, except those whose flags are positively up-to-date.
 295 #
 296 FILES_FLAGS_UP_TO_DATE :=
 297
 298 # For use in expunging commas from flags, which mung our checking.
 299 comma = ,
 300
 301 FILES_FLAGS_EXIST := $(wildcard .*.flags)
 302 ifneq ($(FILES_FLAGS_EXIST),)
 303 include $(FILES_FLAGS_EXIST)
 304 endif
 305
 306 FILES_FLAGS_CHANGED := $(strip \
 307     $(filter-out $(FILES_FLAGS_UP_TO_DATE), \
 308         $(O_TARGET) $(O_OBJS) $(OX_OBJS) \
 309         $(L_TARGET) $(L_OBJS) $(LX_OBJS) \
 310         $(M_OBJS) $(MX_OBJS) \
 311         $(MI_OBJS) $(MIX_OBJS) \
 312         ))
 313
 314 # A kludge: .S files don't get flag dependencies (yet),
 315 #   because that will involve changing a lot of Makefiles.  Also
 316 #   suppress object files explicitly listed in $(IGNORE_FLAGS_OBJS).
 317 #   This allows handling of assembly files that get translated into
 318 #   multiple object files (see arch/ia64/lib/idiv.S, for example).
 319 FILES_FLAGS_CHANGED := $(strip \
 320     $(filter-out $(patsubst %.S, %.o, $(wildcard *.S) $(IGNORE_FLAGS_OBJS)), \
 321     $(FILES_FLAGS_CHANGED)))
 322
 323 ifneq ($(FILES_FLAGS_CHANGED),)
 324 $(FILES_FLAGS_CHANGED): dummy
 325 endif