LXR linux-old/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#
  13unexport EXTRA_AFLAGS
  14unexport EXTRA_CFLAGS
  15unexport EXTRA_LDFLAGS
  16unexport EXTRA_ARFLAGS
  17unexport SUBDIRS
  18unexport SUB_DIRS
  19unexport ALL_SUB_DIRS
  20unexport MOD_SUB_DIRS
  21unexport O_TARGET
  22unexport ALL_MOBJS
  23
  24unexport obj-y
  25unexport obj-m
  26unexport obj-n
  27unexport obj-
  28unexport export-objs
  29unexport subdir-y
  30unexport subdir-m
  31unexport subdir-n
  32unexport subdir-
  33
  34comma   := ,
  35
  36#
  37# Get things started.
  38#
  39first_rule: sub_dirs
  40        $(MAKE) all_targets
  41
  42both-m          := $(filter $(mod-subdirs), $(subdir-y))
  43SUB_DIRS        := $(subdir-y)
  44MOD_SUB_DIRS    := $(sort $(subdir-m) $(both-m))
  45ALL_SUB_DIRS    := $(sort $(subdir-y) $(subdir-m) $(subdir-n) $(subdir-))
  46
  47
  48#
  49# Common rules
  50#
  51
  52%.s: %.c
  53        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -S $< -o $@
  54
  55%.i: %.c
  56        $(CPP) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) $< > $@
  57
  58%.o: %.c
  59        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -c -o $@ $<
  60        @ ( \
  61            echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@))),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@))))' ; \
  62            echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
  63            echo 'endif' \
  64        ) > $(dir $@)/.$(notdir $@).flags
  65
  66%.o: %.s
  67        $(AS) $(AFLAGS) $(EXTRA_CFLAGS) -o $@ $<
  68
  69# Old makefiles define their own rules for compiling .S files,
  70# but these standard rules are available for any Makefile that
  71# wants to use them.  Our plan is to incrementally convert all
  72# the Makefiles to these standard rules.  -- rmk, mec
  73ifdef USE_STANDARD_AS_RULE
  74
  75%.s: %.S
  76        $(CPP) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) $< > $@
  77
  78%.o: %.S
  79        $(CC) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) -c -o $@ $<
  80
  81endif
  82
  83%.lst: %.c
  84        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -g -c -o $*.o $<
  85        $(TOPDIR)/scripts/makelst $* $(TOPDIR) $(OBJDUMP)
  86#
  87#
  88#
  89all_targets: $(O_TARGET) $(L_TARGET)
  90
  91#
  92# Rule to compile a set of .o files into one .o file
  93#
  94ifdef O_TARGET
  95$(O_TARGET): $(obj-y)
  96        rm -f $@
  97    ifneq "$(strip $(obj-y))" ""
  98        $(LD) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^)
  99    else
 100        $(AR) rcs $@
 101    endif
 102        @ ( \
 103            echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_LDFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_LDFLAGS) $$(obj-y))))' ; \
 104            echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 105            echo 'endif' \
 106        ) > $(dir $@)/.$(notdir $@).flags
 107endif # O_TARGET
 108
 109#
 110# Rule to compile a set of .o files into one .a file
 111#
 112ifdef L_TARGET
 113$(L_TARGET): $(obj-y)
 114        rm -f $@
 115        $(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y)
 116        @ ( \
 117            echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(obj-y))))' ; \
 118            echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 119            echo 'endif' \
 120        ) > $(dir $@)/.$(notdir $@).flags
 121endif
 122
 123
 124#
 125# This make dependencies quickly
 126#
 127fastdep: dummy
 128        $(TOPDIR)/scripts/mkdep $(CFLAGS) $(EXTRA_CFLAGS) -- $(wildcard *.[chS]) > .depend
 129ifdef ALL_SUB_DIRS
 130        $(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
 131endif
 132
 133ifdef _FASTDEP_ALL_SUB_DIRS
 134$(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
 135        $(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
 136endif
 137
 138        
 139#
 140# A rule to make subdirectories
 141#
 142subdir-list = $(sort $(patsubst %,_subdir_%,$(SUB_DIRS)))
 143sub_dirs: dummy $(subdir-list)
 144
 145ifdef SUB_DIRS
 146$(subdir-list) : dummy
 147        $(MAKE) -C $(patsubst _subdir_%,%,$@)
 148endif
 149
 150#
 151# A rule to make modules
 152#
 153ALL_MOBJS = $(filter-out $(obj-y), $(obj-m))
 154ifneq "$(strip $(ALL_MOBJS))" ""
 155MOD_DESTDIR := $(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 156endif
 157
 158unexport MOD_DIRS
 159MOD_DIRS := $(MOD_SUB_DIRS) $(MOD_IN_SUB_DIRS)
 160ifneq "$(strip $(MOD_DIRS))" ""
 161.PHONY: $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 162$(patsubst %,_modsubdir_%,$(MOD_DIRS)) : dummy
 163        $(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules
 164
 165.PHONY: $(patsubst %,_modinst_%,$(MOD_DIRS))
 166$(patsubst %,_modinst_%,$(MOD_DIRS)) : dummy
 167        $(MAKE) -C $(patsubst _modinst_%,%,$@) modules_install
 168endif
 169
 170.PHONY: modules
 171modules: $(ALL_MOBJS) dummy \
 172         $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 173
 174.PHONY: _modinst__
 175_modinst__: dummy
 176ifneq "$(strip $(ALL_MOBJS))" ""
 177        mkdir -p $(MODLIB)/kernel/$(MOD_DESTDIR)
 178        cp $(ALL_MOBJS) $(MODLIB)/kernel/$(MOD_DESTDIR)$(MOD_TARGET)
 179endif
 180
 181.PHONY: modules_install
 182modules_install: _modinst__ \
 183         $(patsubst %,_modinst_%,$(MOD_DIRS))
 184
 185#
 186# A rule to do nothing
 187#
 188dummy:
 189
 190#
 191# This is useful for testing
 192#
 193script:
 194        $(SCRIPT)
 195
 196#
 197# This sets version suffixes on exported symbols
 198# Separate the object into "normal" objects and "exporting" objects
 199# Exporting objects are: all objects that define symbol tables
 200#
 201ifdef CONFIG_MODULES
 202
 203multi-used      := $(filter $(list-multi), $(obj-y) $(obj-m))
 204multi-objs      := $(foreach m, $(multi-used), $($(basename $(m))-objs))
 205active-objs     := $(sort $(multi-objs) $(obj-y) $(obj-m))
 206
 207ifdef CONFIG_MODVERSIONS
 208ifneq "$(strip $(export-objs))" ""
 209
 210MODINCL = $(TOPDIR)/include/linux/modules
 211
 212# The -w option (enable warnings) for genksyms will return here in 2.1
 213# So where has it gone?
 214#
 215# Added the SMP separator to stop module accidents between uniprocessor
 216# and SMP Intel boxes - AC - from bits by Michael Chastain
 217#
 218
 219ifdef CONFIG_SMP
 220        genksyms_smp_prefix := -p smp_
 221else
 222        genksyms_smp_prefix := 
 223endif
 224
 225$(MODINCL)/%.ver: %.c
 226        @if [ ! -r $(MODINCL)/$*.stamp -o $(MODINCL)/$*.stamp -ot $< ]; then \
 227                echo '$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -E -D__GENKSYMS__ $<'; \
 228                echo '| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
 229                $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -E -D__GENKSYMS__ $< \
 230                | $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp; \
 231                if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
 232                else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
 233        fi; touch $(MODINCL)/$*.stamp
 234        
 235$(addprefix $(MODINCL)/,$(export-objs:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
 236
 237# updates .ver files but not modversions.h
 238fastdep: $(addprefix $(MODINCL)/,$(export-objs:.o=.ver))
 239
 240# updates .ver files and modversions.h like before (is this needed?)
 241dep: fastdep update-modverfile
 242
 243endif # export-objs 
 244
 245# update modversions.h, but only if it would change
 246update-modverfile:
 247        @(echo "#ifndef _LINUX_MODVERSIONS_H";\
 248          echo "#define _LINUX_MODVERSIONS_H"; \
 249          echo "#include <linux/modsetver.h>"; \
 250          cd $(TOPDIR)/include/linux/modules; \
 251          for f in *.ver; do \
 252            if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
 253          done; \
 254          echo "#endif"; \
 255        ) > $(TOPDIR)/include/linux/modversions.h.tmp
 256        @if [ -r $(TOPDIR)/include/linux/modversions.h ] && cmp -s $(TOPDIR)/include/linux/modversions.h $(TOPDIR)/include/linux/modversions.h.tmp; then \
 257                echo $(TOPDIR)/include/linux/modversions.h was not updated; \
 258                rm -f $(TOPDIR)/include/linux/modversions.h.tmp; \
 259        else \
 260                echo $(TOPDIR)/include/linux/modversions.h was updated; \
 261                mv -f $(TOPDIR)/include/linux/modversions.h.tmp $(TOPDIR)/include/linux/modversions.h; \
 262        fi
 263
 264$(active-objs): $(TOPDIR)/include/linux/modversions.h
 265
 266else
 267
 268$(TOPDIR)/include/linux/modversions.h:
 269        @echo "#include <linux/modsetver.h>" > $@
 270
 271endif # CONFIG_MODVERSIONS
 272
 273ifneq "$(strip $(export-objs))" ""
 274$(export-objs): $(export-objs:.o=.c) $(TOPDIR)/include/linux/modversions.h
 275        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
 276        @ ( \
 277            echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
 278            echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 279            echo 'endif' \
 280        ) > $(dir $@)/.$(notdir $@).flags
 281endif
 282
 283endif # CONFIG_MODULES
 284
 285
 286#
 287# include dependency files if they exist
 288#
 289ifneq ($(wildcard .depend),)
 290include .depend
 291endif
 292
 293ifneq ($(wildcard $(TOPDIR)/.hdepend),)
 294include $(TOPDIR)/.hdepend
 295endif
 296
 297#
 298# Find files whose flags have changed and force recompilation.
 299# For safety, this works in the converse direction:
 300#   every file is forced, except those whose flags are positively up-to-date.
 301#
 302FILES_FLAGS_UP_TO_DATE :=
 303
 304# For use in expunging commas from flags, which mung our checking.
 305comma = ,
 306
 307FILES_FLAGS_EXIST := $(wildcard .*.flags)
 308ifneq ($(FILES_FLAGS_EXIST),)
 309include $(FILES_FLAGS_EXIST)
 310endif
 311
 312FILES_FLAGS_CHANGED := $(strip \
 313    $(filter-out $(FILES_FLAGS_UP_TO_DATE), \
 314        $(O_TARGET) $(L_TARGET) $(active-objs) \
 315        ))
 316
 317# A kludge: .S files don't get flag dependencies (yet),
 318#   because that will involve changing a lot of Makefiles.  Also
 319#   suppress object files explicitly listed in $(IGNORE_FLAGS_OBJS).
 320#   This allows handling of assembly files that get translated into
 321#   multiple object files (see arch/ia64/lib/idiv.S, for example).
 322FILES_FLAGS_CHANGED := $(strip \
 323    $(filter-out $(patsubst %.S, %.o, $(wildcard *.S) $(IGNORE_FLAGS_OBJS)), \
 324    $(FILES_FLAGS_CHANGED)))
 325
 326ifneq ($(FILES_FLAGS_CHANGED),)
 327$(FILES_FLAGS_CHANGED): dummy
 328endif
 329