26ad24aa231cf1d5af01907b57730e471478b5b1
[sfrench/cifs-2.6.git] / scripts / Makefile.build
1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
3 # Building
4 # ==========================================================================
5
6 src := $(obj)
7
8 PHONY := __build
9 __build:
10
11 # Init all relevant variables used in kbuild files so
12 # 1) they have correct type
13 # 2) they do not inherit any value from the environment
14 obj-y :=
15 obj-m :=
16 lib-y :=
17 lib-m :=
18 always :=
19 targets :=
20 subdir-y :=
21 subdir-m :=
22 EXTRA_AFLAGS   :=
23 EXTRA_CFLAGS   :=
24 EXTRA_CPPFLAGS :=
25 EXTRA_LDFLAGS  :=
26 asflags-y  :=
27 ccflags-y  :=
28 cppflags-y :=
29 ldflags-y  :=
30
31 subdir-asflags-y :=
32 subdir-ccflags-y :=
33
34 # Read auto.conf if it exists, otherwise ignore
35 -include include/config/auto.conf
36
37 include scripts/Kbuild.include
38
39 # For backward compatibility check that these variables do not change
40 save-cflags := $(CFLAGS)
41
42 # The filename Kbuild has precedence over Makefile
43 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
44 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
45 include $(kbuild-file)
46
47 # If the save-* variables changed error out
48 ifeq ($(KBUILD_NOPEDANTIC),)
49         ifneq ("$(save-cflags)","$(CFLAGS)")
50                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
51         endif
52 endif
53
54 include scripts/Makefile.lib
55
56 ifdef host-progs
57 ifneq ($(hostprogs-y),$(host-progs))
58 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
59 hostprogs-y += $(host-progs)
60 endif
61 endif
62
63 # Do not include host rules unless needed
64 ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
65 include scripts/Makefile.host
66 endif
67
68 ifneq ($(KBUILD_SRC),)
69 # Create output directory if not already present
70 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
71
72 # Create directories for object files if directory does not exist
73 # Needed when obj-y := dir/file.o syntax is used
74 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
75 endif
76
77 ifndef obj
78 $(warning kbuild: Makefile.build is included improperly)
79 endif
80
81 # ===========================================================================
82
83 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
84 lib-target := $(obj)/lib.a
85 obj-y += $(obj)/lib-ksyms.o
86 endif
87
88 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
89 builtin-target := $(obj)/built-in.o
90 endif
91
92 modorder-target := $(obj)/modules.order
93
94 # We keep a list of all modules in $(MODVERDIR)
95
96 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
97          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
98          $(subdir-ym) $(always)
99         @:
100
101 # Linus' kernel sanity checking tool
102 ifneq ($(KBUILD_CHECKSRC),0)
103   ifeq ($(KBUILD_CHECKSRC),2)
104     quiet_cmd_force_checksrc = CHECK   $<
105           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
106   else
107       quiet_cmd_checksrc     = CHECK   $<
108             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
109   endif
110 endif
111
112 # Do section mismatch analysis for each module/built-in.o
113 ifdef CONFIG_DEBUG_SECTION_MISMATCH
114   cmd_secanalysis = ; scripts/mod/modpost $@
115 endif
116
117 # Compile C sources (.c)
118 # ---------------------------------------------------------------------------
119
120 # Default is built-in, unless we know otherwise
121 modkern_cflags =                                          \
122         $(if $(part-of-module),                           \
123                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
124                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
125 quiet_modtag := $(empty)   $(empty)
126
127 $(real-objs-m)        : part-of-module := y
128 $(real-objs-m:.o=.i)  : part-of-module := y
129 $(real-objs-m:.o=.s)  : part-of-module := y
130 $(real-objs-m:.o=.lst): part-of-module := y
131
132 $(real-objs-m)        : quiet_modtag := [M]
133 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
134 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
135 $(real-objs-m:.o=.lst): quiet_modtag := [M]
136
137 $(obj-m)              : quiet_modtag := [M]
138
139 # Default for not multi-part modules
140 modname = $(basetarget)
141
142 $(multi-objs-m)         : modname = $(modname-multi)
143 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
144 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
145 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
146 $(multi-objs-y)         : modname = $(modname-multi)
147 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
148 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
149 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
150
151 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
152 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
153
154 $(obj)/%.s: $(src)/%.c FORCE
155         $(call if_changed_dep,cc_s_c)
156
157 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
158 cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $<
159
160 $(obj)/%.i: $(src)/%.c FORCE
161         $(call if_changed_dep,cpp_i_c)
162
163 # These mirror gensymtypes_S and co below, keep them in synch.
164 cmd_gensymtypes_c =                                                         \
165     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
166     $(GENKSYMS) $(if $(1), -T $(2))                                         \
167      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
168      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
169      $(if $(KBUILD_PRESERVE),-p)                                            \
170      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
171
172 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
173 cmd_cc_symtypes_c =                                                         \
174     set -e;                                                                 \
175     $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \
176     test -s $@ || rm -f $@
177
178 $(obj)/%.symtypes : $(src)/%.c FORCE
179         $(call cmd,cc_symtypes_c)
180
181 # LLVM assembly
182 # Generate .ll files from .c
183 quiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@
184       cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
185
186 $(obj)/%.ll: $(src)/%.c FORCE
187         $(call if_changed_dep,cc_ll_c)
188
189 # C (.c) files
190 # The C file is compiled and updated dependency information is generated.
191 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
192
193 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
194
195 ifndef CONFIG_MODVERSIONS
196 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
197
198 else
199 # When module versioning is enabled the following steps are executed:
200 # o compile a .tmp_<file>.o from <file>.c
201 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
202 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
203 #   are done.
204 # o otherwise, we calculate symbol versions using the good old
205 #   genksyms on the preprocessed source and postprocess them in a way
206 #   that they are usable as a linker script
207 # o generate <file>.o from .tmp_<file>.o using the linker to
208 #   replace the unresolved symbols __crc_exported_symbol with
209 #   the actual value of the checksum generated by genksyms
210
211 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
212
213 cmd_modversions_c =                                                             \
214         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
215                 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
216                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
217                                                                                 \
218                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
219                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
220                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
221         else                                                                    \
222                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
223         fi;
224 endif
225
226 ifdef CONFIG_FTRACE_MCOUNT_RECORD
227 ifdef BUILD_C_RECORDMCOUNT
228 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
229   RECORDMCOUNT_FLAGS = -w
230 endif
231 # Due to recursion, we must skip empty.o.
232 # The empty.o file is created in the make process in order to determine
233 # the target endianness and word size. It is made before all other C
234 # files, including recordmcount.
235 sub_cmd_record_mcount =                                 \
236         if [ $(@) != "scripts/mod/empty.o" ]; then      \
237                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
238         fi;
239 recordmcount_source := $(srctree)/scripts/recordmcount.c \
240                     $(srctree)/scripts/recordmcount.h
241 else
242 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
243         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
244         "$(if $(CONFIG_64BIT),64,32)" \
245         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
246         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
247         "$(if $(part-of-module),1,0)" "$(@)";
248 recordmcount_source := $(srctree)/scripts/recordmcount.pl
249 endif # BUILD_C_RECORDMCOUNT
250 cmd_record_mcount =                                             \
251         if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =   \
252              "$(CC_FLAGS_FTRACE)" ]; then                       \
253                 $(sub_cmd_record_mcount)                        \
254         fi;
255 endif # CONFIG_FTRACE_MCOUNT_RECORD
256
257 ifdef CONFIG_STACK_VALIDATION
258 ifneq ($(SKIP_STACK_VALIDATION),1)
259
260 __objtool_obj := $(objtree)/tools/objtool/objtool
261
262 objtool_args = $(if $(CONFIG_ORC_UNWINDER),orc generate,check)
263
264 ifndef CONFIG_FRAME_POINTER
265 objtool_args += --no-fp
266 endif
267 ifdef CONFIG_GCOV_KERNEL
268 objtool_args += --no-unreachable
269 else
270 objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
271 endif
272
273 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
274 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
275 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
276 cmd_objtool = $(if $(patsubst y%,, \
277         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
278         $(__objtool_obj) $(objtool_args) "$(@)";)
279 objtool_obj = $(if $(patsubst y%,, \
280         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
281         $(__objtool_obj))
282
283 endif # SKIP_STACK_VALIDATION
284 endif # CONFIG_STACK_VALIDATION
285
286 # Rebuild all objects when objtool changes, or is enabled/disabled.
287 objtool_dep = $(objtool_obj)                                    \
288               $(wildcard include/config/orc/unwinder.h          \
289                          include/config/stack/validation.h)
290
291 define rule_cc_o_c
292         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
293         $(call cmd_and_fixdep,cc_o_c)                                     \
294         $(cmd_modversions_c)                                              \
295         $(call echo-cmd,objtool) $(cmd_objtool)                           \
296         $(call echo-cmd,record_mcount) $(cmd_record_mcount)
297 endef
298
299 define rule_as_o_S
300         $(call cmd_and_fixdep,as_o_S)                                     \
301         $(cmd_modversions_S)                                              \
302         $(call echo-cmd,objtool) $(cmd_objtool)
303 endef
304
305 # List module undefined symbols (or empty line if not enabled)
306 ifdef CONFIG_TRIM_UNUSED_KSYMS
307 cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
308 else
309 cmd_undef_syms = echo
310 endif
311
312 # Built-in and composite module parts
313 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
314         $(call cmd,force_checksrc)
315         $(call if_changed_rule,cc_o_c)
316
317 # Single-part modules are special since we need to mark them in $(MODVERDIR)
318
319 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
320         $(call cmd,force_checksrc)
321         $(call if_changed_rule,cc_o_c)
322         @{ echo $(@:.o=.ko); echo $@; \
323            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
324
325 quiet_cmd_cc_lst_c = MKLST   $@
326       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
327                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
328                                      System.map $(OBJDUMP) > $@
329
330 $(obj)/%.lst: $(src)/%.c FORCE
331         $(call if_changed_dep,cc_lst_c)
332
333 # Compile assembler sources (.S)
334 # ---------------------------------------------------------------------------
335
336 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
337
338 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
339 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
340
341 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
342 # or a file that it includes, in order to get versioned symbols. We build a
343 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
344 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
345 #
346 # This is convoluted. The .S file must first be preprocessed to run guards and
347 # expand names, then the resulting exports must be constructed into plain
348 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
349 # to make the genksyms input.
350 #
351 # These mirror gensymtypes_c and co above, keep them in synch.
352 cmd_gensymtypes_S =                                                         \
353     (echo "\#include <linux/kernel.h>" ;                                    \
354      echo "\#include <asm/asm-prototypes.h>" ;                              \
355     $(CPP) $(a_flags) $< |                                                  \
356      grep "\<___EXPORT_SYMBOL\>" |                                          \
357      sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
358     $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \
359     $(GENKSYMS) $(if $(1), -T $(2))                                         \
360      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
361      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
362      $(if $(KBUILD_PRESERVE),-p)                                            \
363      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
364
365 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
366 cmd_cc_symtypes_S =                                                         \
367     set -e;                                                                 \
368     $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
369     test -s $@ || rm -f $@
370
371 $(obj)/%.symtypes : $(src)/%.S FORCE
372         $(call cmd,cc_symtypes_S)
373
374
375 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
376 cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $<
377
378 $(obj)/%.s: $(src)/%.S FORCE
379         $(call if_changed_dep,cpp_s_S)
380
381 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
382
383 ifndef CONFIG_MODVERSIONS
384 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
385
386 else
387
388 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
389
390 ifeq ($(ASM_PROTOTYPES),)
391 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
392
393 else
394
395 # versioning matches the C process described above, with difference that
396 # we parse asm-prototypes.h C header to get function definitions.
397
398 cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
399
400 cmd_modversions_S =                                                             \
401         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
402                 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
403                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
404                                                                                 \
405                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
406                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
407                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
408         else                                                                    \
409                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
410         fi;
411 endif
412 endif
413
414 $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
415         $(call if_changed_rule,as_o_S)
416
417 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
418 targets += $(extra-y) $(MAKECMDGOALS) $(always)
419
420 # Linker scripts preprocessor (.lds.S -> .lds)
421 # ---------------------------------------------------------------------------
422 quiet_cmd_cpp_lds_S = LDS     $@
423       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
424                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
425
426 $(obj)/%.lds: $(src)/%.lds.S FORCE
427         $(call if_changed_dep,cpp_lds_S)
428
429 # ASN.1 grammar
430 # ---------------------------------------------------------------------------
431 quiet_cmd_asn1_compiler = ASN.1   $@
432       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
433                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
434
435 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
436
437 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
438         $(call cmd,asn1_compiler)
439
440 # Build the compiled-in targets
441 # ---------------------------------------------------------------------------
442
443 # To build objects in subdirs, we need to descend into the directories
444 $(sort $(subdir-obj-y)): $(subdir-ym) ;
445
446 #
447 # Rule to compile a set of .o files into one .o file
448 #
449 ifdef builtin-target
450
451 ifdef CONFIG_THIN_ARCHIVES
452   cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
453   cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
454   quiet_cmd_link_o_target = AR      $@
455 else
456   cmd_make_builtin = $(LD) $(ld_flags) -r -o
457   cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
458   quiet_cmd_link_o_target = LD      $@
459 endif
460
461 # If the list of objects to link is empty, just create an empty built-in.o
462 cmd_link_o_target = $(if $(strip $(obj-y)),\
463                       $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
464                       $(cmd_secanalysis),\
465                       $(cmd_make_empty_builtin) $@)
466
467 $(builtin-target): $(obj-y) FORCE
468         $(call if_changed,link_o_target)
469
470 targets += $(builtin-target)
471 endif # builtin-target
472
473 #
474 # Rule to create modules.order file
475 #
476 # Create commands to either record .ko file or cat modules.order from
477 # a subdirectory
478 modorder-cmds =                                         \
479         $(foreach m, $(modorder),                       \
480                 $(if $(filter %/modules.order, $m),     \
481                         cat $m;, echo kernel/$m;))
482
483 $(modorder-target): $(subdir-ym) FORCE
484         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
485
486 #
487 # Rule to compile a set of .o files into one .a file
488 #
489 ifdef lib-target
490 quiet_cmd_link_l_target = AR      $@
491
492 ifdef CONFIG_THIN_ARCHIVES
493   cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
494 else
495   cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
496 endif
497
498 $(lib-target): $(lib-y) FORCE
499         $(call if_changed,link_l_target)
500
501 targets += $(lib-target)
502
503 dummy-object = $(obj)/.lib_exports.o
504 ksyms-lds = $(dot-target).lds
505 ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
506 ref_prefix = EXTERN(_
507 else
508 ref_prefix = EXTERN(
509 endif
510
511 quiet_cmd_export_list = EXPORTS $@
512 cmd_export_list = $(OBJDUMP) -h $< | \
513         sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
514         rm -f $(dummy-object);\
515         echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
516         $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
517         rm $(dummy-object) $(ksyms-lds)
518
519 $(obj)/lib-ksyms.o: $(lib-target) FORCE
520         $(call if_changed,export_list)
521
522 targets += $(obj)/lib-ksyms.o
523
524 endif
525
526 #
527 # Rule to link composite objects
528 #
529 #  Composite objects are specified in kbuild makefile as follows:
530 #    <composite-object>-objs := <list of .o files>
531 #  or
532 #    <composite-object>-y    := <list of .o files>
533 #  or
534 #    <composite-object>-m    := <list of .o files>
535 #  The -m syntax only works if <composite object> is a module
536 link_multi_deps =                     \
537 $(filter $(addprefix $(obj)/,         \
538 $($(subst $(obj)/,,$(@:.o=-objs)))    \
539 $($(subst $(obj)/,,$(@:.o=-y)))       \
540 $($(subst $(obj)/,,$(@:.o=-m)))), $^)
541
542 cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
543
544 ifdef CONFIG_THIN_ARCHIVES
545   quiet_cmd_link_multi-y = AR      $@
546   cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
547 else
548   quiet_cmd_link_multi-y = LD      $@
549   cmd_link_multi-y = $(cmd_link_multi-link)
550 endif
551
552 quiet_cmd_link_multi-m = LD [M]  $@
553 cmd_link_multi-m = $(cmd_link_multi-link)
554
555 $(multi-used-y): FORCE
556         $(call if_changed,link_multi-y)
557 $(call multi_depend, $(multi-used-y), .o, -objs -y)
558
559 $(multi-used-m): FORCE
560         $(call if_changed,link_multi-m)
561         @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
562            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
563 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
564
565 targets += $(multi-used-y) $(multi-used-m)
566
567
568 # Descending
569 # ---------------------------------------------------------------------------
570
571 PHONY += $(subdir-ym)
572 $(subdir-ym):
573         $(Q)$(MAKE) $(build)=$@
574
575 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
576 # ---------------------------------------------------------------------------
577
578 PHONY += FORCE
579
580 FORCE:
581
582 # Read all saved command lines and dependencies for the $(targets) we
583 # may be building above, using $(if_changed{,_dep}). As an
584 # optimization, we don't need to read them if the target does not
585 # exist, we will rebuild anyway in that case.
586
587 targets := $(wildcard $(sort $(targets)))
588 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
589
590 ifneq ($(cmd_files),)
591   include $(cmd_files)
592 endif
593
594 # Declare the contents of the .PHONY variable as phony.  We keep that
595 # information in a variable se we can use it in if_changed and friends.
596
597 .PHONY: $(PHONY)