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