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 ALL_MOBJS
  23
  24 unexport obj-y
  25 unexport obj-m
  26 unexport obj-n
  27 unexport obj-
  28 unexport export-objs
  29 unexport subdir-y
  30 unexport subdir-m
  31 unexport subdir-n
  32 unexport subdir-
  33
  34 #
  35 # Get things started.
  36 #
  37 first_rule: sub_dirs
  38         $(MAKE) all_targets
  39
  40 both-m          := $(filter $(mod-subdirs), $(subdir-y))
  41 SUB_DIRS        := $(subdir-y)
  42 MOD_SUB_DIRS    := $(sort $(subdir-m) $(both-m))
  43 ALL_SUB_DIRS    := $(sort $(subdir-y) $(subdir-m) $(subdir-n) $(subdir-))
  44
  45
  46 #
  47 # Common rules
  48 #
  49
  50 %.s: %.c
  51         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -S $< -o $@
  52
  53 %.i: %.c
  54         $(CPP) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) $< > $@
  55
  56 %.o: %.c
  57         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -c -o $@ $<
  58         @ ( \
  59             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@))),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@))))' ; \
  60             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
  61             echo 'endif' \
  62         ) > $(dir $@)/.$(notdir $@).flags
  63
  64 %.o: %.s
  65         $(AS) $(AFLAGS) $(EXTRA_CFLAGS) -o $@ $<
  66
  67 # Old makefiles define their own rules for compiling .S files,
  68 # but these standard rules are available for any Makefile that
  69 # wants to use them.  Our plan is to incrementally convert all
  70 # the Makefiles to these standard rules.  -- rmk, mec
  71 ifdef USE_STANDARD_AS_RULE
  72
  73 %.s: %.S
  74         $(CPP) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) $< > $@
  75
  76 %.o: %.S
  77         $(CC) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) -c -o $@ $<
  78
  79 endif
  80
  81 %.lst: %.c
  82         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -g -c -o $*.o $<
  83         $(TOPDIR)/scripts/makelst $* $(TOPDIR) $(OBJDUMP)
  84 #
  85 #
  86 #
  87 all_targets: $(O_TARGET) $(L_TARGET)
  88
  89 #
  90 # Rule to compile a set of .o files into one .o file
  91 #
  92 ifdef O_TARGET
  93 $(O_TARGET): $(obj-y)
  94         rm -f $@
  95     ifneq "$(strip $(obj-y))" ""
  96         $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^)
  97     else
  98         $(AR) rcs $@
  99     endif
 100         @ ( \
 101             echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_LDFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_LDFLAGS) $$(obj-y))))' ; \
 102             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 103             echo 'endif' \
 104         ) > $(dir $@)/.$(notdir $@).flags
 105 endif # O_TARGET
 106
 107 #
 108 # Rule to compile a set of .o files into one .a file
 109 #
 110 ifdef L_TARGET
 111 $(L_TARGET): $(obj-y)
 112         rm -f $@
 113         $(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y)
 114         @ ( \
 115             echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(obj-y))))' ; \
 116             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 117             echo 'endif' \
 118         ) > $(dir $@)/.$(notdir $@).flags
 119 endif
 120
 121
 122 #
 123 # This make dependencies quickly
 124 #
 125 fastdep: dummy
 126         $(TOPDIR)/scripts/mkdep $(wildcard *.[chS] local.h.master) > .depend
 127 ifdef ALL_SUB_DIRS
 128         $(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
 129 endif
 130
 131 ifdef _FASTDEP_ALL_SUB_DIRS
 132 $(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
 133         $(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
 134 endif
 135
 136
 137 #
 138 # A rule to make subdirectories
 139 #
 140 subdir-list = $(sort $(patsubst %,_subdir_%,$(SUB_DIRS)))
 141 sub_dirs: dummy $(subdir-list)
 142
 143 ifdef SUB_DIRS
 144 $(subdir-list) : dummy
 145         $(MAKE) -C $(patsubst _subdir_%,%,$@)
 146 endif
 147
 148 #
 149 # A rule to make modules
 150 #
 151 ALL_MOBJS = $(filter-out $(obj-y), $(obj-m))
 152 ifneq "$(strip $(ALL_MOBJS))" ""
 153 PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 154 endif
 155
 156 unexport MOD_DIRS
 157 MOD_DIRS := $(MOD_SUB_DIRS) $(MOD_IN_SUB_DIRS)
 158 ifneq "$(strip $(MOD_DIRS))" ""
 159 .PHONY: $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 160 $(patsubst %,_modsubdir_%,$(MOD_DIRS)) : dummy
 161         $(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules
 162
 163 .PHONY: $(patsubst %,_modinst_%,$(MOD_DIRS))
 164 $(patsubst %,_modinst_%,$(MOD_DIRS)) : dummy
 165         $(MAKE) -C $(patsubst _modinst_%,%,$@) modules_install
 166 endif
 167
 168 .PHONY: modules
 169 modules: $(ALL_MOBJS) dummy \
 170          $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 171
 172 .PHONY: _modinst__
 173 _modinst__: dummy
 174 ifneq "$(strip $(ALL_MOBJS))" ""
 175         mkdir -p $(MODLIB)/kernel/$(PDWN)
 176         cp $(ALL_MOBJS) $(MODLIB)/kernel/$(PDWN)
 177 endif
 178
 179 .PHONY: modules_install
 180 modules_install: _modinst__ \
 181          $(patsubst %,_modinst_%,$(MOD_DIRS))
 182
 183 #
 184 # A rule to do nothing
 185 #
 186 dummy:
 187
 188 #
 189 # This is useful for testing
 190 #
 191 script:
 192         $(SCRIPT)
 193
 194 #
 195 # This sets version suffixes on exported symbols
 196 # Separate the object into "normal" objects and "exporting" objects
 197 # Exporting objects are: all objects that define symbol tables
 198 #
 199 ifdef CONFIG_MODULES
 200
 201 multi-used      := $(filter $(list-multi), $(obj-y) $(obj-m))
 202 multi-objs      := $(foreach m, $(multi-used), $($(basename $(m))-objs))
 203 active-objs     := $(sort $(multi-objs) $(obj-y) $(obj-m))
 204
 205 ifdef CONFIG_MODVERSIONS
 206 ifneq "$(strip $(export-objs))" ""
 207
 208 MODINCL = $(TOPDIR)/include/linux/modules
 209
 210 # The -w option (enable warnings) for genksyms will return here in 2.1
 211 # So where has it gone?
 212 #
 213 # Added the SMP separator to stop module accidents between uniprocessor
 214 # and SMP Intel boxes - AC - from bits by Michael Chastain
 215 #
 216
 217 ifdef CONFIG_SMP
 218         genksyms_smp_prefix := -p smp_
 219 else
 220         genksyms_smp_prefix :=
 221 endif
 222
 223 $(MODINCL)/%.ver: %.c
 224         @if [ ! -r $(MODINCL)/$*.stamp -o $(MODINCL)/$*.stamp -ot $< ]; then \
 225                 echo '$(CC) $(CFLAGS) -E -D__GENKSYMS__ $<'; \
 226                 echo '| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
 227                 $(CC) $(CFLAGS) -E -D__GENKSYMS__ $< \
 228                 | $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp; \
 229                 if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
 230                 else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
 231         fi; touch $(MODINCL)/$*.stamp
 232
 233 $(addprefix $(MODINCL)/,$(export-objs:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 234
 235 # updates .ver files but not modversions.h
 236 fastdep: $(addprefix $(MODINCL)/,$(export-objs:.o=.ver))
 237
 238 # updates .ver files and modversions.h like before (is this needed?)
 239 dep: fastdep update-modverfile
 240
 241 endif # export-objs
 242
 243 # update modversions.h, but only if it would change
 244 update-modverfile:
 245         @(echo "#ifndef _LINUX_MODVERSIONS_H";\
 246           echo "#define _LINUX_MODVERSIONS_H"; \
 247           echo "#include <linux/modsetver.h>"; \
 248           cd $(TOPDIR)/include/linux/modules; \
 249           for f in *.ver; do \
 250             if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 251           done; \
 252           echo "#endif"; \
 253         ) > $(TOPDIR)/include/linux/modversions.h.tmp
 254         @if [ -r $(TOPDIR)/include/linux/modversions.h ] && cmp -s $(TOPDIR)/include/linux/modversions.h $(TOPDIR)/include/linux/modversions.h.tmp; then \
 255                 echo $(TOPDIR)/include/linux/modversions.h was not updated; \
 256                 rm -f $(TOPDIR)/include/linux/modversions.h.tmp; \
 257         else \
 258                 echo $(TOPDIR)/include/linux/modversions.h was updated; \
 259                 mv -f $(TOPDIR)/include/linux/modversions.h.tmp $(TOPDIR)/include/linux/modversions.h; \
 260         fi
 261
 262 $(active-objs): $(TOPDIR)/include/linux/modversions.h
 263
 264 else
 265
 266 $(TOPDIR)/include/linux/modversions.h:
 267         @echo "#include <linux/modsetver.h>" > $@
 268
 269 endif # CONFIG_MODVERSIONS
 270
 271 ifneq "$(strip $(export-objs))" ""
 272 $(export-objs): $(export-objs:.o=.c) $(TOPDIR)/include/linux/modversions.h
 273         $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
 274         @ ( \
 275             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
 276             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 277             echo 'endif' \
 278         ) > $(dir $@)/.$(notdir $@).flags
 279 endif
 280
 281 endif # CONFIG_MODULES
 282
 283
 284 #
 285 # include dependency files if they exist
 286 #
 287 ifneq ($(wildcard .depend),)
 288 include .depend
 289 endif
 290
 291 ifneq ($(wildcard $(TOPDIR)/.hdepend),)
 292 include $(TOPDIR)/.hdepend
 293 endif
 294
 295 #
 296 # Find files whose flags have changed and force recompilation.
 297 # For safety, this works in the converse direction:
 298 #   every file is forced, except those whose flags are positively up-to-date.
 299 #
 300 FILES_FLAGS_UP_TO_DATE :=
 301
 302 # For use in expunging commas from flags, which mung our checking.
 303 comma = ,
 304
 305 FILES_FLAGS_EXIST := $(wildcard .*.flags)
 306 ifneq ($(FILES_FLAGS_EXIST),)
 307 include $(FILES_FLAGS_EXIST)
 308 endif
 309
 310 FILES_FLAGS_CHANGED := $(strip \
 311     $(filter-out $(FILES_FLAGS_UP_TO_DATE), \
 312         $(O_TARGET) $(L_TARGET) $(active-objs) \
 313         ))
 314
 315 # A kludge: .S files don't get flag dependencies (yet),
 316 #   because that will involve changing a lot of Makefiles.  Also
 317 #   suppress object files explicitly listed in $(IGNORE_FLAGS_OBJS).
 318 #   This allows handling of assembly files that get translated into
 319 #   multiple object files (see arch/ia64/lib/idiv.S, for example).
 320 FILES_FLAGS_CHANGED := $(strip \
 321     $(filter-out $(patsubst %.S, %.o, $(wildcard *.S) $(IGNORE_FLAGS_OBJS)), \
 322     $(FILES_FLAGS_CHANGED)))
 323
 324 ifneq ($(FILES_FLAGS_CHANGED),)
 325 $(FILES_FLAGS_CHANGED): dummy
 326 endif