Import 2.3.18
[davej-history.git] / Rules.make
blob6f8a10f2eaa15cd5ce231259d0caf04174ff3067
2 # This file contains rules which are shared between multiple Makefiles.
6 # False targets.
8 .PHONY: dummy
11 # Special variables which should not be exported
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
35 unexport MOD_LIST_NAME
38 # Get things started.
40 first_rule: sub_dirs
41 $(MAKE) all_targets
44 # Common rules
47 %.s: %.c
48 $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -S $< -o $@
50 %.i: %.c
51 $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -E $< > $@
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
61 %.o: %.s
62 $(AS) $(ASFLAGS) $(EXTRA_CFLAGS) -o $@ $<
67 all_targets: $(O_TARGET) $(L_TARGET)
70 # Rule to compile a set of .o files into one .o file
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 $@ $(filter $(ALL_O), $^)
78 else
79 $(AR) rcs $@ $(filter $(ALL_O), $^)
80 endif
81 @ ( \
82 echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_LDFLAGS) $(ALL_O))),$$(strip $$(subst $$(comma),:,$$(EXTRA_LDFLAGS) $$(ALL_O))))' ; \
83 echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
84 echo 'endif' \
85 ) > $(dir $@)/.$(notdir $@).flags
86 endif # O_TARGET
89 # Rule to compile a set of .o files into one .a file
91 ifdef L_TARGET
92 $(L_TARGET): $(LX_OBJS) $(L_OBJS)
93 rm -f $@
94 $(AR) $(EXTRA_ARFLAGS) rcs $@ $(LX_OBJS) $(L_OBJS)
95 @ ( \
96 echo 'ifeq ($(strip $(subst $(comma),:,$(EXTRA_ARFLAGS) $(LX_OBJS) $(L_OBJS))),$$(strip $$(subst $$(comma),:,$$(EXTRA_ARFLAGS) $$(LX_OBJS) $$(L_OBJS))))' ; \
97 echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
98 echo 'endif' \
99 ) > $(dir $@)/.$(notdir $@).flags
100 endif
103 # This make dependencies quickly
105 fastdep: dummy
106 $(TOPDIR)/scripts/mkdep $(wildcard *.[chS] local.h.master) > .depend
107 ifdef ALL_SUB_DIRS
108 $(MAKE) $(patsubst %,_sfdep_%,$(ALL_SUB_DIRS)) _FASTDEP_ALL_SUB_DIRS="$(ALL_SUB_DIRS)"
109 endif
111 ifdef _FASTDEP_ALL_SUB_DIRS
112 $(patsubst %,_sfdep_%,$(_FASTDEP_ALL_SUB_DIRS)):
113 $(MAKE) -C $(patsubst _sfdep_%,%,$@) fastdep
114 endif
118 # A rule to make subdirectories
120 sub_dirs: dummy $(patsubst %,_subdir_%,$(SUB_DIRS))
122 ifdef SUB_DIRS
123 $(patsubst %,_subdir_%,$(SUB_DIRS)) : dummy
124 $(MAKE) -C $(patsubst _subdir_%,%,$@)
125 endif
128 # A rule to make modules
130 ALL_MOBJS = $(MX_OBJS) $(M_OBJS)
131 ifneq "$(strip $(ALL_MOBJS))" ""
132 PDWN=$(shell $(CONFIG_SHELL) $(TOPDIR)/scripts/pathdown.sh)
133 endif
135 ifdef MOD_SUB_DIRS
136 $(patsubst %,_modsubdir_%,$(MOD_SUB_DIRS)) : dummy
137 $(MAKE) -C $(patsubst _modsubdir_%,%,$@) modules
138 endif
140 ifdef MOD_IN_SUB_DIRS
141 $(patsubst %,_modinsubdir_%,$(MOD_IN_SUB_DIRS)) : dummy
142 $(MAKE) -C $(patsubst _modinsubdir_%,%,$@) modules
143 endif
145 modules: $(ALL_MOBJS) $(MIX_OBJS) $(MI_OBJS) dummy \
146 $(patsubst %,_modsubdir_%,$(MOD_SUB_DIRS)) \
147 $(patsubst %,_modinsubdir_%,$(MOD_IN_SUB_DIRS))
148 ifneq "$(strip $(MOD_LIST_NAME))" ""
149 rm -f $$TOPDIR/modules/$(MOD_LIST_NAME)
150 ifdef MOD_SUB_DIRS
151 for i in $(MOD_SUB_DIRS); do \
152 echo `basename $$i`.o >> $$TOPDIR/modules/$(MOD_LIST_NAME); done
153 endif
154 ifneq "$(strip $(ALL_MOBJS))" ""
155 echo $(ALL_MOBJS) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
156 endif
157 ifneq "$(strip $(MOD_TO_LIST))" ""
158 echo $(MOD_TO_LIST) >> $$TOPDIR/modules/$(MOD_LIST_NAME)
159 endif
160 endif
161 ifneq "$(strip $(ALL_MOBJS))" ""
162 echo $(PDWN)
163 cd $$TOPDIR/modules; for i in $(ALL_MOBJS); do \
164 ln -sf ../$(PDWN)/$$i $$i; done
165 endif
168 # A rule to do nothing
170 dummy:
173 # This is useful for testing
175 script:
176 $(SCRIPT)
179 # This sets version suffixes on exported symbols
180 # Uses SYMTAB_OBJS
181 # Separate the object into "normal" objects and "exporting" objects
182 # Exporting objects are: all objects that define symbol tables
184 ifdef CONFIG_MODULES
186 SYMTAB_OBJS = $(LX_OBJS) $(OX_OBJS) $(MX_OBJS) $(MIX_OBJS)
188 ifdef CONFIG_MODVERSIONS
189 ifneq "$(strip $(SYMTAB_OBJS))" ""
191 MODINCL = $(TOPDIR)/include/linux/modules
193 # The -w option (enable warnings) for genksyms will return here in 2.1
194 # So where has it gone?
196 # Added the SMP separator to stop module accidents between uniprocessor
197 # and SMP Intel boxes - AC - from bits by Michael Chastain
200 ifdef CONFIG_SMP
201 genksyms_smp_prefix := -p smp_
202 else
203 genksyms_smp_prefix :=
204 endif
206 $(MODINCL)/%.ver: %.c
207 @if [ ! -r $(MODINCL)/$*.stamp -o $(MODINCL)/$*.stamp -ot $< ]; then \
208 echo '$(CC) $(CFLAGS) -E -D__GENKSYMS__ $<'; \
209 echo '| $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp'; \
210 $(CC) $(CFLAGS) -E -D__GENKSYMS__ $< \
211 | $(GENKSYMS) $(genksyms_smp_prefix) -k $(VERSION).$(PATCHLEVEL).$(SUBLEVEL) > $@.tmp; \
212 if [ -r $@ ] && cmp -s $@ $@.tmp; then echo $@ is unchanged; rm -f $@.tmp; \
213 else echo mv $@.tmp $@; mv -f $@.tmp $@; fi; \
214 fi; touch $(MODINCL)/$*.stamp
216 $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver)): $(TOPDIR)/include/linux/autoconf.h
218 $(TOPDIR)/include/linux/modversions.h: $(addprefix $(MODINCL)/,$(SYMTAB_OBJS:.o=.ver))
219 @echo updating $(TOPDIR)/include/linux/modversions.h
220 @(echo "#ifndef _LINUX_MODVERSIONS_H";\
221 echo "#define _LINUX_MODVERSIONS_H"; \
222 echo "#include <linux/modsetver.h>"; \
223 cd $(TOPDIR)/include/linux/modules; \
224 for f in *.ver; do \
225 if [ -f $$f ]; then echo "#include <linux/modules/$${f}>"; fi; \
226 done; \
227 echo "#endif"; \
228 ) > $@
230 dep fastdep: $(TOPDIR)/include/linux/modversions.h
232 endif # SYMTAB_OBJS
234 $(M_OBJS): $(TOPDIR)/include/linux/modversions.h
235 ifdef MAKING_MODULES
236 $(O_OBJS) $(L_OBJS): $(TOPDIR)/include/linux/modversions.h
237 endif
239 else
241 $(TOPDIR)/include/linux/modversions.h:
242 @echo "#include <linux/modsetver.h>" > $@
244 endif # CONFIG_MODVERSIONS
246 ifneq "$(strip $(SYMTAB_OBJS))" ""
247 $(SYMTAB_OBJS): $(TOPDIR)/include/linux/modversions.h $(SYMTAB_OBJS:.o=.c)
248 $(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB -c $(@:.o=.c)
249 @ ( \
250 echo 'ifeq ($(strip $(subst $(comma),:,$(CFLAGS) $(EXTRA_CFLAGS) $(CFLAGS_$@) -DEXPORT_SYMTAB)),$$(strip $$(subst $$(comma),:,$$(CFLAGS) $$(EXTRA_CFLAGS) $$(CFLAGS_$@) -DEXPORT_SYMTAB)))' ; \
251 echo 'FILES_FLAGS_UP_TO_DATE += $@' ; \
252 echo 'endif' \
253 ) > $(dir $@)/.$(notdir $@).flags
254 endif
256 endif # CONFIG_MODULES
260 # include dependency files if they exist
262 ifneq ($(wildcard .depend),)
263 include .depend
264 endif
266 ifneq ($(wildcard $(TOPDIR)/.hdepend),)
267 include $(TOPDIR)/.hdepend
268 endif
271 # Find files whose flags have changed and force recompilation.
272 # For safety, this works in the converse direction:
273 # every file is forced, except those whose flags are positively up-to-date.
275 FILES_FLAGS_UP_TO_DATE :=
277 # For use in expunging commas from flags, which mung our checking.
278 comma = ,
280 FILES_FLAGS_EXIST := $(wildcard .*.flags)
281 ifneq ($(FILES_FLAGS_EXIST),)
282 include $(FILES_FLAGS_EXIST)
283 endif
285 FILES_FLAGS_CHANGED := $(strip \
286 $(filter-out $(FILES_FLAGS_UP_TO_DATE), \
287 $(O_TARGET) $(O_OBJS) $(OX_OBJS) \
288 $(L_TARGET) $(L_OBJS) $(LX_OBJS) \
289 $(M_OBJS) $(MX_OBJS) \
290 $(MI_OBJS) $(MIX_OBJS) \
293 # A kludge: .S files don't get flag dependencies (yet),
294 # because that will involve changing a lot of Makefiles.
295 FILES_FLAGS_CHANGED := $(strip \
296 $(filter-out $(patsubst %.S, %.o, $(wildcard *.S)), \
297 $(FILES_FLAGS_CHANGED)))
299 ifneq ($(FILES_FLAGS_CHANGED),)
300 $(FILES_FLAGS_CHANGED): dummy
301 endif