drm/i915/gvt: Don't mark vgpu context as inactive when preempted
[sfrench/cifs-2.6.git] / scripts / Makefile.build
1 # ==========================================================================
2 # Building
3 # ==========================================================================
4
5 src := $(obj)
6
7 PHONY := __build
8 __build:
9
10 # Init all relevant variables used in kbuild files so
11 # 1) they have correct type
12 # 2) they do not inherit any value from the environment
13 obj-y :=
14 obj-m :=
15 lib-y :=
16 lib-m :=
17 always :=
18 targets :=
19 subdir-y :=
20 subdir-m :=
21 EXTRA_AFLAGS   :=
22 EXTRA_CFLAGS   :=
23 EXTRA_CPPFLAGS :=
24 EXTRA_LDFLAGS  :=
25 asflags-y  :=
26 ccflags-y  :=
27 cppflags-y :=
28 ldflags-y  :=
29
30 subdir-asflags-y :=
31 subdir-ccflags-y :=
32
33 # Read auto.conf if it exists, otherwise ignore
34 -include include/config/auto.conf
35
36 include scripts/Kbuild.include
37
38 # For backward compatibility check that these variables do not change
39 save-cflags := $(CFLAGS)
40
41 # The filename Kbuild has precedence over Makefile
42 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
43 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44 include $(kbuild-file)
45
46 # If the save-* variables changed error out
47 ifeq ($(KBUILD_NOPEDANTIC),)
48         ifneq ("$(save-cflags)","$(CFLAGS)")
49                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
50         endif
51 endif
52
53 include scripts/Makefile.lib
54
55 ifdef host-progs
56 ifneq ($(hostprogs-y),$(host-progs))
57 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
58 hostprogs-y += $(host-progs)
59 endif
60 endif
61
62 # Do not include host rules unless needed
63 ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
64 include scripts/Makefile.host
65 endif
66
67 ifneq ($(KBUILD_SRC),)
68 # Create output directory if not already present
69 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
70
71 # Create directories for object files if directory does not exist
72 # Needed when obj-y := dir/file.o syntax is used
73 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
74 endif
75
76 ifndef obj
77 $(warning kbuild: Makefile.build is included improperly)
78 endif
79
80 # ===========================================================================
81
82 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
83 lib-target := $(obj)/lib.a
84 obj-y += $(obj)/lib-ksyms.o
85 endif
86
87 ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
88 builtin-target := $(obj)/built-in.o
89 endif
90
91 modorder-target := $(obj)/modules.order
92
93 # We keep a list of all modules in $(MODVERDIR)
94
95 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
96          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
97          $(subdir-ym) $(always)
98         @:
99
100 # Linus' kernel sanity checking tool
101 ifneq ($(KBUILD_CHECKSRC),0)
102   ifeq ($(KBUILD_CHECKSRC),2)
103     quiet_cmd_force_checksrc = CHECK   $<
104           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
105   else
106       quiet_cmd_checksrc     = CHECK   $<
107             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
108   endif
109 endif
110
111 # Do section mismatch analysis for each module/built-in.o
112 ifdef CONFIG_DEBUG_SECTION_MISMATCH
113   cmd_secanalysis = ; scripts/mod/modpost $@
114 endif
115
116 # Compile C sources (.c)
117 # ---------------------------------------------------------------------------
118
119 # Default is built-in, unless we know otherwise
120 modkern_cflags =                                          \
121         $(if $(part-of-module),                           \
122                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
123                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
124 quiet_modtag := $(empty)   $(empty)
125
126 $(real-objs-m)        : part-of-module := y
127 $(real-objs-m:.o=.i)  : part-of-module := y
128 $(real-objs-m:.o=.s)  : part-of-module := y
129 $(real-objs-m:.o=.lst): part-of-module := y
130
131 $(real-objs-m)        : quiet_modtag := [M]
132 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
133 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
134 $(real-objs-m:.o=.lst): quiet_modtag := [M]
135
136 $(obj-m)              : quiet_modtag := [M]
137
138 # Default for not multi-part modules
139 modname = $(basetarget)
140
141 $(multi-objs-m)         : modname = $(modname-multi)
142 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
143 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
144 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
145 $(multi-objs-y)         : modname = $(modname-multi)
146 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
147 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
148 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
149
150 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
151 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
152
153 $(obj)/%.s: $(src)/%.c FORCE
154         $(call if_changed_dep,cc_s_c)
155
156 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
157 cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $<
158
159 $(obj)/%.i: $(src)/%.c FORCE
160         $(call if_changed_dep,cpp_i_c)
161
162 # These mirror gensymtypes_S and co below, keep them in synch.
163 cmd_gensymtypes_c =                                                         \
164     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
165     $(GENKSYMS) $(if $(1), -T $(2))                                         \
166      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
167      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
168      $(if $(KBUILD_PRESERVE),-p)                                            \
169      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
170
171 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
172 cmd_cc_symtypes_c =                                                         \
173     set -e;                                                                 \
174     $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \
175     test -s $@ || rm -f $@
176
177 $(obj)/%.symtypes : $(src)/%.c FORCE
178         $(call cmd,cc_symtypes_c)
179
180 # LLVM assembly
181 # Generate .ll files from .c
182 quiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@
183       cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
184
185 $(obj)/%.ll: $(src)/%.c FORCE
186         $(call if_changed_dep,cc_ll_c)
187
188 # C (.c) files
189 # The C file is compiled and updated dependency information is generated.
190 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
191
192 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
193
194 ifndef CONFIG_MODVERSIONS
195 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
196
197 else
198 # When module versioning is enabled the following steps are executed:
199 # o compile a .tmp_<file>.o from <file>.c
200 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
201 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
202 #   are done.
203 # o otherwise, we calculate symbol versions using the good old
204 #   genksyms on the preprocessed source and postprocess them in a way
205 #   that they are usable as a linker script
206 # o generate <file>.o from .tmp_<file>.o using the linker to
207 #   replace the unresolved symbols __crc_exported_symbol with
208 #   the actual value of the checksum generated by genksyms
209
210 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
211
212 cmd_modversions_c =                                                             \
213         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
214                 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
215                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
216                                                                                 \
217                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
218                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
219                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
220         else                                                                    \
221                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
222         fi;
223 endif
224
225 ifdef CONFIG_FTRACE_MCOUNT_RECORD
226 ifdef BUILD_C_RECORDMCOUNT
227 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
228   RECORDMCOUNT_FLAGS = -w
229 endif
230 # Due to recursion, we must skip empty.o.
231 # The empty.o file is created in the make process in order to determine
232 # the target endianness and word size. It is made before all other C
233 # files, including recordmcount.
234 sub_cmd_record_mcount =                                 \
235         if [ $(@) != "scripts/mod/empty.o" ]; then      \
236                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
237         fi;
238 recordmcount_source := $(srctree)/scripts/recordmcount.c \
239                     $(srctree)/scripts/recordmcount.h
240 else
241 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
242         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
243         "$(if $(CONFIG_64BIT),64,32)" \
244         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
245         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
246         "$(if $(part-of-module),1,0)" "$(@)";
247 recordmcount_source := $(srctree)/scripts/recordmcount.pl
248 endif # BUILD_C_RECORDMCOUNT
249 cmd_record_mcount =                                             \
250         if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =   \
251              "$(CC_FLAGS_FTRACE)" ]; then                       \
252                 $(sub_cmd_record_mcount)                        \
253         fi;
254 endif # CONFIG_FTRACE_MCOUNT_RECORD
255
256 ifdef CONFIG_STACK_VALIDATION
257 ifneq ($(SKIP_STACK_VALIDATION),1)
258
259 __objtool_obj := $(objtree)/tools/objtool/objtool
260
261 objtool_args = $(if $(CONFIG_ORC_UNWINDER),orc generate,check)
262
263 ifndef CONFIG_FRAME_POINTER
264 objtool_args += --no-fp
265 endif
266 ifdef CONFIG_GCOV_KERNEL
267 objtool_args += --no-unreachable
268 else
269 objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
270 endif
271
272 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
273 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
274 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
275 cmd_objtool = $(if $(patsubst y%,, \
276         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
277         $(__objtool_obj) $(objtool_args) "$(@)";)
278 objtool_obj = $(if $(patsubst y%,, \
279         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
280         $(__objtool_obj))
281
282 endif # SKIP_STACK_VALIDATION
283 endif # CONFIG_STACK_VALIDATION
284
285 # Rebuild all objects when objtool changes, or is enabled/disabled.
286 objtool_dep = $(objtool_obj)                                    \
287               $(wildcard include/config/orc/unwinder.h          \
288                          include/config/stack/validation.h)
289
290 define rule_cc_o_c
291         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
292         $(call cmd_and_fixdep,cc_o_c)                                     \
293         $(cmd_modversions_c)                                              \
294         $(call echo-cmd,objtool) $(cmd_objtool)                           \
295         $(call echo-cmd,record_mcount) $(cmd_record_mcount)
296 endef
297
298 define rule_as_o_S
299         $(call cmd_and_fixdep,as_o_S)                                     \
300         $(cmd_modversions_S)                                              \
301         $(call echo-cmd,objtool) $(cmd_objtool)
302 endef
303
304 # List module undefined symbols (or empty line if not enabled)
305 ifdef CONFIG_TRIM_UNUSED_KSYMS
306 cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
307 else
308 cmd_undef_syms = echo
309 endif
310
311 # Built-in and composite module parts
312 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
313         $(call cmd,force_checksrc)
314         $(call if_changed_rule,cc_o_c)
315
316 # Single-part modules are special since we need to mark them in $(MODVERDIR)
317
318 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
319         $(call cmd,force_checksrc)
320         $(call if_changed_rule,cc_o_c)
321         @{ echo $(@:.o=.ko); echo $@; \
322            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
323
324 quiet_cmd_cc_lst_c = MKLST   $@
325       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
326                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
327                                      System.map $(OBJDUMP) > $@
328
329 $(obj)/%.lst: $(src)/%.c FORCE
330         $(call if_changed_dep,cc_lst_c)
331
332 # Compile assembler sources (.S)
333 # ---------------------------------------------------------------------------
334
335 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
336
337 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
338 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
339
340 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
341 # or a file that it includes, in order to get versioned symbols. We build a
342 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
343 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
344 #
345 # This is convoluted. The .S file must first be preprocessed to run guards and
346 # expand names, then the resulting exports must be constructed into plain
347 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
348 # to make the genksyms input.
349 #
350 # These mirror gensymtypes_c and co above, keep them in synch.
351 cmd_gensymtypes_S =                                                         \
352     (echo "\#include <linux/kernel.h>" ;                                    \
353      echo "\#include <asm/asm-prototypes.h>" ;                              \
354     $(CPP) $(a_flags) $< |                                                  \
355      grep "\<___EXPORT_SYMBOL\>" |                                          \
356      sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
357     $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \
358     $(GENKSYMS) $(if $(1), -T $(2))                                         \
359      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
360      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
361      $(if $(KBUILD_PRESERVE),-p)                                            \
362      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
363
364 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
365 cmd_cc_symtypes_S =                                                         \
366     set -e;                                                                 \
367     $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
368     test -s $@ || rm -f $@
369
370 $(obj)/%.symtypes : $(src)/%.S FORCE
371         $(call cmd,cc_symtypes_S)
372
373
374 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
375 cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $<
376
377 $(obj)/%.s: $(src)/%.S FORCE
378         $(call if_changed_dep,cpp_s_S)
379
380 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
381
382 ifndef CONFIG_MODVERSIONS
383 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
384
385 else
386
387 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
388
389 ifeq ($(ASM_PROTOTYPES),)
390 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
391
392 else
393
394 # versioning matches the C process described above, with difference that
395 # we parse asm-prototypes.h C header to get function definitions.
396
397 cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
398
399 cmd_modversions_S =                                                             \
400         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
401                 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
402                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
403                                                                                 \
404                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
405                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
406                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
407         else                                                                    \
408                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
409         fi;
410 endif
411 endif
412
413 $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
414         $(call if_changed_rule,as_o_S)
415
416 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
417 targets += $(extra-y) $(MAKECMDGOALS) $(always)
418
419 # Linker scripts preprocessor (.lds.S -> .lds)
420 # ---------------------------------------------------------------------------
421 quiet_cmd_cpp_lds_S = LDS     $@
422       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
423                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
424
425 $(obj)/%.lds: $(src)/%.lds.S FORCE
426         $(call if_changed_dep,cpp_lds_S)
427
428 # ASN.1 grammar
429 # ---------------------------------------------------------------------------
430 quiet_cmd_asn1_compiler = ASN.1   $@
431       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
432                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
433
434 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
435
436 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
437         $(call cmd,asn1_compiler)
438
439 # Build the compiled-in targets
440 # ---------------------------------------------------------------------------
441
442 # To build objects in subdirs, we need to descend into the directories
443 $(sort $(subdir-obj-y)): $(subdir-ym) ;
444
445 #
446 # Rule to compile a set of .o files into one .o file
447 #
448 ifdef builtin-target
449
450 ifdef CONFIG_THIN_ARCHIVES
451   cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
452   cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
453   quiet_cmd_link_o_target = AR      $@
454 else
455   cmd_make_builtin = $(LD) $(ld_flags) -r -o
456   cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
457   quiet_cmd_link_o_target = LD      $@
458 endif
459
460 # If the list of objects to link is empty, just create an empty built-in.o
461 cmd_link_o_target = $(if $(strip $(obj-y)),\
462                       $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
463                       $(cmd_secanalysis),\
464                       $(cmd_make_empty_builtin) $@)
465
466 $(builtin-target): $(obj-y) FORCE
467         $(call if_changed,link_o_target)
468
469 targets += $(builtin-target)
470 endif # builtin-target
471
472 #
473 # Rule to create modules.order file
474 #
475 # Create commands to either record .ko file or cat modules.order from
476 # a subdirectory
477 modorder-cmds =                                         \
478         $(foreach m, $(modorder),                       \
479                 $(if $(filter %/modules.order, $m),     \
480                         cat $m;, echo kernel/$m;))
481
482 $(modorder-target): $(subdir-ym) FORCE
483         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
484
485 #
486 # Rule to compile a set of .o files into one .a file
487 #
488 ifdef lib-target
489 quiet_cmd_link_l_target = AR      $@
490
491 ifdef CONFIG_THIN_ARCHIVES
492   cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
493 else
494   cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
495 endif
496
497 $(lib-target): $(lib-y) FORCE
498         $(call if_changed,link_l_target)
499
500 targets += $(lib-target)
501
502 dummy-object = $(obj)/.lib_exports.o
503 ksyms-lds = $(dot-target).lds
504 ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
505 ref_prefix = EXTERN(_
506 else
507 ref_prefix = EXTERN(
508 endif
509
510 quiet_cmd_export_list = EXPORTS $@
511 cmd_export_list = $(OBJDUMP) -h $< | \
512         sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
513         rm -f $(dummy-object);\
514         echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
515         $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
516         rm $(dummy-object) $(ksyms-lds)
517
518 $(obj)/lib-ksyms.o: $(lib-target) FORCE
519         $(call if_changed,export_list)
520
521 targets += $(obj)/lib-ksyms.o
522
523 endif
524
525 #
526 # Rule to link composite objects
527 #
528 #  Composite objects are specified in kbuild makefile as follows:
529 #    <composite-object>-objs := <list of .o files>
530 #  or
531 #    <composite-object>-y    := <list of .o files>
532 #  or
533 #    <composite-object>-m    := <list of .o files>
534 #  The -m syntax only works if <composite object> is a module
535 link_multi_deps =                     \
536 $(filter $(addprefix $(obj)/,         \
537 $($(subst $(obj)/,,$(@:.o=-objs)))    \
538 $($(subst $(obj)/,,$(@:.o=-y)))       \
539 $($(subst $(obj)/,,$(@:.o=-m)))), $^)
540
541 cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
542
543 ifdef CONFIG_THIN_ARCHIVES
544   quiet_cmd_link_multi-y = AR      $@
545   cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
546 else
547   quiet_cmd_link_multi-y = LD      $@
548   cmd_link_multi-y = $(cmd_link_multi-link)
549 endif
550
551 quiet_cmd_link_multi-m = LD [M]  $@
552 cmd_link_multi-m = $(cmd_link_multi-link)
553
554 $(multi-used-y): FORCE
555         $(call if_changed,link_multi-y)
556 $(call multi_depend, $(multi-used-y), .o, -objs -y)
557
558 $(multi-used-m): FORCE
559         $(call if_changed,link_multi-m)
560         @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
561            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
562 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
563
564 targets += $(multi-used-y) $(multi-used-m)
565
566
567 # Descending
568 # ---------------------------------------------------------------------------
569
570 PHONY += $(subdir-ym)
571 $(subdir-ym):
572         $(Q)$(MAKE) $(build)=$@
573
574 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
575 # ---------------------------------------------------------------------------
576
577 PHONY += FORCE
578
579 FORCE:
580
581 # Read all saved command lines and dependencies for the $(targets) we
582 # may be building above, using $(if_changed{,_dep}). As an
583 # optimization, we don't need to read them if the target does not
584 # exist, we will rebuild anyway in that case.
585
586 targets := $(wildcard $(sort $(targets)))
587 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
588
589 ifneq ($(cmd_files),)
590   include $(cmd_files)
591 endif
592
593 # Declare the contents of the .PHONY variable as phony.  We keep that
594 # information in a variable se we can use it in if_changed and friends.
595
596 .PHONY: $(PHONY)