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
  34#
  35# Get things started.
  36#
  37first_rule: sub_dirs
  38        $(MAKE) all_targets
  39
  40both-m          := $(filter $(mod-subdirs), $(subdir-y))
  41SUB_DIRS        := $(subdir-y)
  42MOD_SUB_DIRS    := $(sort $(subdir-m) $(both-m))
  43ALL_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
  71ifdef 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
  79endif
  80
  81%.lst: %.c
  82        $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -g -c -o $*.o $<
  83        $(TOPDIR)/scripts/makelst $* $(TOPDIR) $(OBJDUMP)
  84#
  85#
  86#
  87all_targets: $(O_TARGET) $(L_TARGET)
  88
  89#
  90# Rule to compile a set of .o files into one .o file
  91#
  92ifdef O_TARGET
  93$(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) $$(obj-y))))' ; \
 102            echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 103            echo 'endif' \
 104        ) > $(dir $@)/.$(notdir $@).flags
 105endif # O_TARGET
 106
 107#
 108# Rule to compile a set of .o files into one .a file
 109#
 110ifdef L_TARGET
 111$(L_TARGET): $(obj-y)
 112        rm -f $@
 113        $(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y)
 114        @ ( \
 115            echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(obj-y))))' ; \
 116            echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 117            echo 'endif' \
 118        ) > $(dir $@)/.$(notdir $@).flags
 119endif
 120
 121
 122#
 123# This make dependencies quickly
 124#
 125fastdep: dummy
 126        $(TOPDIR)/scripts/mkdep $(wildcard *.[chS] local.h.master) > .depend
 127ifdef ALL_SUB_DIRS
 128        $(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
 129endif
 130
 131ifdef _FASTDEP_ALL_SUB_DIRS
 132$(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
 133        $(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
 134endif
 135
 136        
 137#
 138# A rule to make subdirectories
 139#
 140subdir-list = $(sort $(patsubst %,_subdir_%,$(SUB_DIRS)))
 141sub_dirs: dummy $(subdir-list)
 142
 143ifdef SUB_DIRS
 144$(subdir-list) : dummy
 145        $(MAKE) -C $(patsubst _subdir_%,%,$@)
 146endif
 147
 148#
 149# A rule to make modules
 150#
 151ALL_MOBJS = $(filter-out $(obj-y), $(obj-m))
 152ifneq "$(strip $(ALL_MOBJS))" ""
 153PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
 154endif
 155
 156unexport MOD_DIRS
 157MOD_DIRS := $(MOD_SUB_DIRS) $(MOD_IN_SUB_DIRS)
 158ifneq "$(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
 166endif
 167
 168.PHONY: modules
 169modules: $(ALL_MOBJS) dummy \
 170         $(patsubst %,_modsubdir_%,$(MOD_DIRS))
 171
 172.PHONY: _modinst__
 173_modinst__: dummy
 174ifneq "$(strip $(ALL_MOBJS))" ""
 175        mkdir -p $(MODLIB)/kernel/$(PDWN)
 176        cp $(ALL_MOBJS) $(MODLIB)/kernel/$(PDWN)
 177endif
 178
 179.PHONY: modules_install
 180modules_install: _modinst__ \
 181         $(patsubst %,_modinst_%,$(MOD_DIRS))
 182
 183#
 184# A rule to do nothing
 185#
 186dummy:
 187
 188#
 189# This is useful for testing
 190#
 191script:
 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#
 199ifdef CONFIG_MODULES
 200
 201multi-used      := $(filter $(list-multi), $(obj-y) $(obj-m))
 202multi-objs      := $(foreach m, $(multi-used), $($(basename $(m))-objs))
 203active-objs     := $(sort $(multi-objs) $(obj-y) $(obj-m))
 204
 205ifdef CONFIG_MODVERSIONS
 206ifneq "$(strip $(export-objs))" ""
 207
 208MODINCL = $(TOPDIR)/include/linux/modules
 209
 210# The -w option (enable warnings) for genksyms will return here in 2.1
 211# So where has it gone?
 212#
 213# Added the SMP separator to stop module accidents between uniprocessor
 214# and SMP Intel boxes - AC - from bits by Michael Chastain
 215#
 216
 217ifdef CONFIG_SMP
 218        genksyms_smp_prefix := -p smp_
 219else
 220        genksyms_smp_prefix := 
 221endif
 222
 223$(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
 236fastdep: $(addprefix $(MODINCL)/,$(export-objs:.o=.ver))
 237
 238# updates .ver files and modversions.h like before (is this needed?)
 239dep: fastdep update-modverfile
 240
 241endif # export-objs 
 242
 243# update modversions.h, but only if it would change
 244update-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): $(TOPDIR)/include/linux/modversions.h
 263
 264else
 265
 266$(TOPDIR)/include/linux/modversions.h:
 267        @echo "#include <linux/modsetver.h>" > $@
 268
 269endif # CONFIG_MODVERSIONS
 270
 271ifneq "$(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 $@).flags
 279endif
 280
 281endif # CONFIG_MODULES
 282
 283
 284#
 285# include dependency files if they exist
 286#
 287ifneq ($(wildcard .depend),)
 288include .depend
 289endif
 290
 291ifneq ($(wildcard $(TOPDIR)/.hdepend),)
 292include $(TOPDIR)/.hdepend
 293endif
 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#
 300FILES_FLAGS_UP_TO_DATE :=
 301
 302# For use in expunging commas from flags, which mung our checking.
 303comma = ,
 304
 305FILES_FLAGS_EXIST := $(wildcard .*.flags)
 306ifneq ($(FILES_FLAGS_EXIST),)
 307include $(FILES_FLAGS_EXIST)
 308endif
 309
 310FILES_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).
 320FILES_FLAGS_CHANGED := $(strip \
 321    $(filter-out $(patsubst %.S, %.o, $(wildcard *.S) $(IGNORE_FLAGS_OBJS)), \
 322    $(FILES_FLAGS_CHANGED)))
 323
 324ifneq ($(FILES_FLAGS_CHANGED),)
 325$(FILES_FLAGS_CHANGED): dummy
 326endif
 327