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