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Linux/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 comma   := ,
 35 EXTRA_CFLAGS_nostdinc := $(EXTRA_CFLAGS) $(kbuild_2_4_nostdinc)
 36 
 37 #
 38 # Get things started.
 39 #
 40 first_rule: sub_dirs
 41         $(MAKE) all_targets
 42 
 43 both-m          := $(filter $(mod-subdirs), $(subdir-y))
 44 SUB_DIRS        := $(subdir-y)
 45 MOD_SUB_DIRS    := $(sort $(subdir-m) $(both-m))
 46 ALL_SUB_DIRS    := $(sort $(subdir-y) $(subdir-m) $(subdir-n) $(subdir-))
 47 
 48 
 49 #
 50 # Common rules
 51 #
 52 
 53 %.s: %.c
 54         $(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -S $< -o $@
 55 
 56 %.i: %.c
 57         $(CPP) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) $< > $@
 58 
 59 %.o: %.c
 60         $(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -c -o $@ $<
 61         @ ( \
 62             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@))),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS_nostdinc) $$(CFLAGS_$@))))' ; \
 63             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
 64             echo 'endif' \
 65         ) > $(dir $@)/.$(notdir $@).flags
 66 
 67 %.o: %.s
 68         $(AS) $(AFLAGS) $(EXTRA_CFLAGS) -o $@ $<
 69 
 70 # Old makefiles define their own rules for compiling .S files,
 71 # but these standard rules are available for any Makefile that
 72 # wants to use them.  Our plan is to incrementally convert all
 73 # the Makefiles to these standard rules.  -- rmk, mec
 74 ifdef USE_STANDARD_AS_RULE
 75 
 76 %.s: %.S
 77         $(CPP) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) $< > $@
 78 
 79 %.o: %.S
 80         $(CC) $(AFLAGS) $(EXTRA_AFLAGS) $(AFLAGS_$@) -c -o $@ $<
 81 
 82 endif
 83 
 84 %.lst: %.c
 85         $(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@) -g -c -o $*.o $<
 86         $(TOPDIR)/scripts/makelst $* $(TOPDIR) $(OBJDUMP)
 87 #
 88 #
 89 #
 90 all_targets: $(O_TARGET) $(L_TARGET)
 91 
 92 #
 93 # Rule to compile a set of .o files into one .o file
 94 #
 95 ifdef O_TARGET
 96 $(O_TARGET): $(obj-y)
 97         rm -f $@
 98     ifneq "$(strip $(obj-y))" ""
 99         $(LD) $(LDFLAGS) $(EXTRA_LDFLAGS) -r -o $@ $(filter $(obj-y), $^)
100     else
101         $(AR) rcs $@
102     endif
103         @ ( \
104             echo 'ifeq ($(strip $(subst $(comma),:,$(LDFLAGS) $(EXTRA_LDFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(LDFLAGS) $$(EXTRA_LDFLAGS) $$(obj-y))))' ; \
105             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
106             echo 'endif' \
107         ) > $(dir $@)/.$(notdir $@).flags
108 endif # O_TARGET
109 
110 #
111 # Rule to compile a set of .o files into one .a file
112 #
113 ifdef L_TARGET
114 $(L_TARGET): $(obj-y)
115         rm -f $@
116         $(AR) $(EXTRA_ARFLAGS) rcs $@ $(obj-y)
117         @ ( \
118             echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(obj-y))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(obj-y))))' ; \
119             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
120             echo 'endif' \
121         ) > $(dir $@)/.$(notdir $@).flags
122 endif
123 
124 
125 #
126 # This make dependencies quickly
127 #
128 fastdep: dummy
129         $(TOPDIR)/scripts/mkdep $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -- $(wildcard *.[chS]) > .depend
130 ifdef ALL_SUB_DIRS
131         $(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
132 endif
133 
134 ifdef _FASTDEP_ALL_SUB_DIRS
135 $(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
136         $(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
137 endif
138 
139         
140 #
141 # A rule to make subdirectories
142 #
143 subdir-list = $(sort $(patsubst %,_subdir_%,$(SUB_DIRS)))
144 sub_dirs: dummy $(subdir-list)
145 
146 ifdef SUB_DIRS
147 $(subdir-list) : dummy
148         $(MAKE) -C $(patsubst _subdir_%,%,$@)
149 endif
150 
151 #
152 # A rule to make modules
153 #
154 ALL_MOBJS = $(filter-out $(obj-y), $(obj-m))
155 ifneq "$(strip $(ALL_MOBJS))" ""
156 MOD_DESTDIR := $(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
157 endif
158 
159 unexport MOD_DIRS
160 MOD_DIRS := $(MOD_SUB_DIRS) $(MOD_IN_SUB_DIRS)
161 ifneq "$(strip $(MOD_DIRS))" ""
162 .PHONY: $(patsubst %,_modsubdir_%,$(MOD_DIRS))
163 $(patsubst %,_modsubdir_%,$(MOD_DIRS)) : dummy
164         $(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules
165 
166 .PHONY: $(patsubst %,_modinst_%,$(MOD_DIRS))
167 $(patsubst %,_modinst_%,$(MOD_DIRS)) : dummy
168         $(MAKE) -C $(patsubst _modinst_%,%,$@) modules_install
169 endif
170 
171 .PHONY: modules
172 modules: $(ALL_MOBJS) dummy \
173          $(patsubst %,_modsubdir_%,$(MOD_DIRS))
174 
175 .PHONY: _modinst__
176 _modinst__: dummy
177 ifneq "$(strip $(ALL_MOBJS))" ""
178         mkdir -p $(MODLIB)/kernel/$(MOD_DESTDIR)
179         cp $(sort $(ALL_MOBJS)) $(MODLIB)/kernel/$(MOD_DESTDIR)
180 endif
181 
182 .PHONY: modules_install
183 modules_install: _modinst__ \
184          $(patsubst %,_modinst_%,$(MOD_DIRS))
185 
186 #
187 # A rule to do nothing
188 #
189 dummy:
190 
191 #
192 # This is useful for testing
193 #
194 script:
195         $(SCRIPT)
196 
197 #
198 # This sets version suffixes on exported symbols
199 # Separate the object into "normal" objects and "exporting" objects
200 # Exporting objects are: all objects that define symbol tables
201 #
202 ifdef CONFIG_MODULES
203 
204 multi-used      := $(filter $(list-multi), $(obj-y) $(obj-m))
205 multi-objs      := $(foreach m, $(multi-used), $($(basename $(m))-objs))
206 active-objs     := $(sort $(multi-objs) $(obj-y) $(obj-m))
207 
208 ifdef CONFIG_MODVERSIONS
209 ifneq "$(strip $(export-objs))" ""
210 
211 MODINCL = $(TOPDIR)/include/linux/modules
212 
213 # The -w option (enable warnings) for genksyms will return here in 2.1
214 # So where has it gone?
215 #
216 # Added the SMP separator to stop module accidents between uniprocessor
217 # and SMP Intel boxes - AC - from bits by Michael Chastain
218 #
219 
220 ifdef CONFIG_SMP
221         genksyms_smp_prefix := -p smp_
222 else
223         genksyms_smp_prefix := 
224 endif
225 
226 $(MODINCL)/%.ver: %.c
227         @if [ ! -r $(MODINCL)/$*.stamp -o $(MODINCL)/$*.stamp -ot $< ]; then \
228                 echo '$(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -E -D__GENKSYMS__ $<'; \
229                 echo '| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
230                 $(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -E -D__GENKSYMS__ $< \
231                 | $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp; \
232                 if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
233                 else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
234         fi; touch $(MODINCL)/$*.stamp
235         
236 $(addprefix $(MODINCL)/,$(export-objs:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
237 
238 # updates .ver files but not modversions.h
239 fastdep: $(addprefix $(MODINCL)/,$(export-objs:.o=.ver))
240 
241 # updates .ver files and modversions.h like before (is this needed?)
242 dep: fastdep update-modverfile
243 
244 endif # export-objs 
245 
246 # update modversions.h, but only if it would change
247 update-modverfile:
248         @(echo "#ifndef _LINUX_MODVERSIONS_H";\
249           echo "#define _LINUX_MODVERSIONS_H"; \
250           echo "#include <linux/modsetver.h>"; \
251           cd $(TOPDIR)/include/linux/modules; \
252           for f in *.ver; do \
253             if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
254           done; \
255           echo "#endif"; \
256         ) > $(TOPDIR)/include/linux/modversions.h.tmp
257         @if [ -r $(TOPDIR)/include/linux/modversions.h ] && cmp -s $(TOPDIR)/include/linux/modversions.h $(TOPDIR)/include/linux/modversions.h.tmp; then \
258                 echo $(TOPDIR)/include/linux/modversions.h was not updated; \
259                 rm -f $(TOPDIR)/include/linux/modversions.h.tmp; \
260         else \
261                 echo $(TOPDIR)/include/linux/modversions.h was updated; \
262                 mv -f $(TOPDIR)/include/linux/modversions.h.tmp $(TOPDIR)/include/linux/modversions.h; \
263         fi
264 
265 $(active-objs): $(TOPDIR)/include/linux/modversions.h
266 
267 else
268 
269 $(TOPDIR)/include/linux/modversions.h:
270         @echo "#include <linux/modsetver.h>" > $@
271 
272 endif # CONFIG_MODVERSIONS
273 
274 ifneq "$(strip $(export-objs))" ""
275 $(export-objs): $(export-objs:.o=.c) $(TOPDIR)/include/linux/modversions.h
276         $(CC) $(CFLAGS) $(EXTRA_CFLAGS_nostdinc) -DKBUILD_BASENAME=$(subst $(comma),_,$(subst -,_,$(*F))) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
277         @ ( \
278             echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS_nostdinc) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS_nostdinc) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
279             echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
280             echo 'endif' \
281         ) > $(dir $@)/.$(notdir $@).flags
282 endif
283 
284 endif # CONFIG_MODULES
285 
286 
287 #
288 # include dependency files if they exist
289 #
290 ifneq ($(wildcard .depend),)
291 include .depend
292 endif
293 
294 ifneq ($(wildcard $(TOPDIR)/.hdepend),)
295 include $(TOPDIR)/.hdepend
296 endif
297 
298 #
299 # Find files whose flags have changed and force recompilation.
300 # For safety, this works in the converse direction:
301 #   every file is forced, except those whose flags are positively up-to-date.
302 #
303 FILES_FLAGS_UP_TO_DATE :=
304 
305 # For use in expunging commas from flags, which mung our checking.
306 comma = ,
307 
308 FILES_FLAGS_EXIST := $(wildcard .*.flags)
309 ifneq ($(FILES_FLAGS_EXIST),)
310 include $(FILES_FLAGS_EXIST)
311 endif
312 
313 FILES_FLAGS_CHANGED := $(strip \
314     $(filter-out $(FILES_FLAGS_UP_TO_DATE), \
315         $(O_TARGET) $(L_TARGET) $(active-objs) \
316         ))
317 
318 # A kludge: .S files don't get flag dependencies (yet),
319 #   because that will involve changing a lot of Makefiles.  Also
320 #   suppress object files explicitly listed in $(IGNORE_FLAGS_OBJS).
321 #   This allows handling of assembly files that get translated into
322 #   multiple object files (see arch/ia64/lib/idiv.S, for example).
323 FILES_FLAGS_CHANGED := $(strip \
324     $(filter-out $(patsubst %.S, %.o, $(wildcard *.S) $(IGNORE_FLAGS_OBJS)), \
325     $(FILES_FLAGS_CHANGED)))
326 
327 ifneq ($(FILES_FLAGS_CHANGED),)
328 $(FILES_FLAGS_CHANGED): dummy
329 endif

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