Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[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 ifndef obj
69 $(warning kbuild: Makefile.build is included improperly)
70 endif
71
72 # ===========================================================================
73
74 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
75 lib-target := $(obj)/lib.a
76 obj-y += $(obj)/lib-ksyms.o
77 endif
78
79 ifneq ($(strip $(obj-y) $(need-builtin)),)
80 builtin-target := $(obj)/built-in.o
81 endif
82
83 modorder-target := $(obj)/modules.order
84
85 # We keep a list of all modules in $(MODVERDIR)
86
87 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
88          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
89          $(subdir-ym) $(always)
90         @:
91
92 # Linus' kernel sanity checking tool
93 ifneq ($(KBUILD_CHECKSRC),0)
94   ifeq ($(KBUILD_CHECKSRC),2)
95     quiet_cmd_force_checksrc = CHECK   $<
96           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
97   else
98       quiet_cmd_checksrc     = CHECK   $<
99             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
100   endif
101 endif
102
103 ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
104   cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ;
105 endif
106
107 # Do section mismatch analysis for each module/built-in.o
108 ifdef CONFIG_DEBUG_SECTION_MISMATCH
109   cmd_secanalysis = ; scripts/mod/modpost $@
110 endif
111
112 # Compile C sources (.c)
113 # ---------------------------------------------------------------------------
114
115 # Default is built-in, unless we know otherwise
116 modkern_cflags =                                          \
117         $(if $(part-of-module),                           \
118                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
119                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
120 quiet_modtag := $(empty)   $(empty)
121
122 $(real-objs-m)        : part-of-module := y
123 $(real-objs-m:.o=.i)  : part-of-module := y
124 $(real-objs-m:.o=.s)  : part-of-module := y
125 $(real-objs-m:.o=.lst): part-of-module := y
126
127 $(real-objs-m)        : quiet_modtag := [M]
128 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
129 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
130 $(real-objs-m:.o=.lst): quiet_modtag := [M]
131
132 $(obj-m)              : quiet_modtag := [M]
133
134 # Default for not multi-part modules
135 modname = $(basetarget)
136
137 $(multi-objs-m)         : modname = $(modname-multi)
138 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
139 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
140 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
141 $(multi-objs-y)         : modname = $(modname-multi)
142 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
143 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
144 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
145
146 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
147 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
148
149 $(obj)/%.s: $(src)/%.c FORCE
150         $(call if_changed_dep,cc_s_c)
151
152 quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
153 cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $<
154
155 $(obj)/%.i: $(src)/%.c FORCE
156         $(call if_changed_dep,cpp_i_c)
157
158 # These mirror gensymtypes_S and co below, keep them in synch.
159 cmd_gensymtypes_c =                                                         \
160     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
161     $(GENKSYMS) $(if $(1), -T $(2))                                         \
162      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
163      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
164      $(if $(KBUILD_PRESERVE),-p)                                            \
165      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
166
167 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
168 cmd_cc_symtypes_c =                                                         \
169     set -e;                                                                 \
170     $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \
171     test -s $@ || rm -f $@
172
173 $(obj)/%.symtypes : $(src)/%.c FORCE
174         $(call cmd,cc_symtypes_c)
175
176 # LLVM assembly
177 # Generate .ll files from .c
178 quiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@
179       cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
180
181 $(obj)/%.ll: $(src)/%.c FORCE
182         $(call if_changed_dep,cc_ll_c)
183
184 # C (.c) files
185 # The C file is compiled and updated dependency information is generated.
186 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
187
188 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
189
190 ifndef CONFIG_MODVERSIONS
191 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
192
193 else
194 # When module versioning is enabled the following steps are executed:
195 # o compile a .tmp_<file>.o from <file>.c
196 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
197 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
198 #   are done.
199 # o otherwise, we calculate symbol versions using the good old
200 #   genksyms on the preprocessed source and postprocess them in a way
201 #   that they are usable as a linker script
202 # o generate <file>.o from .tmp_<file>.o using the linker to
203 #   replace the unresolved symbols __crc_exported_symbol with
204 #   the actual value of the checksum generated by genksyms
205
206 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
207
208 cmd_modversions_c =                                                             \
209         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
210                 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
211                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
212                                                                                 \
213                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
214                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
215                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
216         else                                                                    \
217                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
218         fi;
219 endif
220
221 ifdef CONFIG_FTRACE_MCOUNT_RECORD
222 ifdef BUILD_C_RECORDMCOUNT
223 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
224   RECORDMCOUNT_FLAGS = -w
225 endif
226 # Due to recursion, we must skip empty.o.
227 # The empty.o file is created in the make process in order to determine
228 # the target endianness and word size. It is made before all other C
229 # files, including recordmcount.
230 sub_cmd_record_mcount =                                 \
231         if [ $(@) != "scripts/mod/empty.o" ]; then      \
232                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
233         fi;
234 recordmcount_source := $(srctree)/scripts/recordmcount.c \
235                     $(srctree)/scripts/recordmcount.h
236 else
237 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
238         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
239         "$(if $(CONFIG_64BIT),64,32)" \
240         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
241         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
242         "$(if $(part-of-module),1,0)" "$(@)";
243 recordmcount_source := $(srctree)/scripts/recordmcount.pl
244 endif # BUILD_C_RECORDMCOUNT
245 cmd_record_mcount =                                             \
246         if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =   \
247              "$(CC_FLAGS_FTRACE)" ]; then                       \
248                 $(sub_cmd_record_mcount)                        \
249         fi;
250 endif # CONFIG_FTRACE_MCOUNT_RECORD
251
252 ifdef CONFIG_STACK_VALIDATION
253 ifneq ($(SKIP_STACK_VALIDATION),1)
254
255 __objtool_obj := $(objtree)/tools/objtool/objtool
256
257 objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check)
258
259 ifndef CONFIG_FRAME_POINTER
260 objtool_args += --no-fp
261 endif
262 ifdef CONFIG_GCOV_KERNEL
263 objtool_args += --no-unreachable
264 else
265 objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
266 endif
267
268 ifdef CONFIG_MODVERSIONS
269 objtool_o = $(@D)/.tmp_$(@F)
270 else
271 objtool_o = $(@)
272 endif
273
274 # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
275 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
276 # 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
277 cmd_objtool = $(if $(patsubst y%,, \
278         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
279         $(__objtool_obj) $(objtool_args) "$(objtool_o)";)
280 objtool_obj = $(if $(patsubst y%,, \
281         $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
282         $(__objtool_obj))
283
284 endif # SKIP_STACK_VALIDATION
285 endif # CONFIG_STACK_VALIDATION
286
287 # Rebuild all objects when objtool changes, or is enabled/disabled.
288 objtool_dep = $(objtool_obj)                                    \
289               $(wildcard include/config/orc/unwinder.h          \
290                          include/config/stack/validation.h)
291
292 define rule_cc_o_c
293         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
294         $(call cmd_and_fixdep,cc_o_c)                                     \
295         $(cmd_checkdoc)                                                   \
296         $(call echo-cmd,objtool) $(cmd_objtool)                           \
297         $(cmd_modversions_c)                                              \
298         $(call echo-cmd,record_mcount) $(cmd_record_mcount)
299 endef
300
301 define rule_as_o_S
302         $(call cmd_and_fixdep,as_o_S)                                     \
303         $(call echo-cmd,objtool) $(cmd_objtool)                           \
304         $(cmd_modversions_S)
305 endef
306
307 # List module undefined symbols (or empty line if not enabled)
308 ifdef CONFIG_TRIM_UNUSED_KSYMS
309 cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
310 else
311 cmd_undef_syms = echo
312 endif
313
314 # Built-in and composite module parts
315 $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
316         $(call cmd,force_checksrc)
317         $(call if_changed_rule,cc_o_c)
318
319 # Single-part modules are special since we need to mark them in $(MODVERDIR)
320
321 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE
322         $(call cmd,force_checksrc)
323         $(call if_changed_rule,cc_o_c)
324         @{ echo $(@:.o=.ko); echo $@; \
325            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
326
327 quiet_cmd_cc_lst_c = MKLST   $@
328       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
329                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
330                                      System.map $(OBJDUMP) > $@
331
332 $(obj)/%.lst: $(src)/%.c FORCE
333         $(call if_changed_dep,cc_lst_c)
334
335 # Compile assembler sources (.S)
336 # ---------------------------------------------------------------------------
337
338 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
339
340 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
341 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
342
343 # .S file exports must have their C prototypes defined in asm/asm-prototypes.h
344 # or a file that it includes, in order to get versioned symbols. We build a
345 # dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
346 # the .S file (with trailing ';'), and run genksyms on that, to extract vers.
347 #
348 # This is convoluted. The .S file must first be preprocessed to run guards and
349 # expand names, then the resulting exports must be constructed into plain
350 # EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
351 # to make the genksyms input.
352 #
353 # These mirror gensymtypes_c and co above, keep them in synch.
354 cmd_gensymtypes_S =                                                         \
355     (echo "\#include <linux/kernel.h>" ;                                    \
356      echo "\#include <asm/asm-prototypes.h>" ;                              \
357     $(CPP) $(a_flags) $< |                                                  \
358      grep "\<___EXPORT_SYMBOL\>" |                                          \
359      sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
360     $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \
361     $(GENKSYMS) $(if $(1), -T $(2))                                         \
362      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
363      $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \
364      $(if $(KBUILD_PRESERVE),-p)                                            \
365      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
366
367 quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
368 cmd_cc_symtypes_S =                                                         \
369     set -e;                                                                 \
370     $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \
371     test -s $@ || rm -f $@
372
373 $(obj)/%.symtypes : $(src)/%.S FORCE
374         $(call cmd,cc_symtypes_S)
375
376
377 quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
378 cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $<
379
380 $(obj)/%.s: $(src)/%.S FORCE
381         $(call if_changed_dep,cpp_s_S)
382
383 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
384
385 ifndef CONFIG_MODVERSIONS
386 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
387
388 else
389
390 ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
391
392 ifeq ($(ASM_PROTOTYPES),)
393 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
394
395 else
396
397 # versioning matches the C process described above, with difference that
398 # we parse asm-prototypes.h C header to get function definitions.
399
400 cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
401
402 cmd_modversions_S =                                                             \
403         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
404                 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))  \
405                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
406                                                                                 \
407                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
408                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
409                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
410         else                                                                    \
411                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
412         fi;
413 endif
414 endif
415
416 $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE
417         $(call if_changed_rule,as_o_S)
418
419 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
420 targets += $(extra-y) $(MAKECMDGOALS) $(always)
421
422 # Linker scripts preprocessor (.lds.S -> .lds)
423 # ---------------------------------------------------------------------------
424 quiet_cmd_cpp_lds_S = LDS     $@
425       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
426                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
427
428 $(obj)/%.lds: $(src)/%.lds.S FORCE
429         $(call if_changed_dep,cpp_lds_S)
430
431 # ASN.1 grammar
432 # ---------------------------------------------------------------------------
433 quiet_cmd_asn1_compiler = ASN.1   $@
434       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
435                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
436
437 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
438
439 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
440         $(call cmd,asn1_compiler)
441
442 # Build the compiled-in targets
443 # ---------------------------------------------------------------------------
444
445 # To build objects in subdirs, we need to descend into the directories
446 $(sort $(subdir-obj-y)): $(subdir-ym) ;
447
448 #
449 # Rule to compile a set of .o files into one .o file
450 #
451 ifdef builtin-target
452
453 ifdef CONFIG_THIN_ARCHIVES
454   cmd_make_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
455   cmd_make_empty_builtin = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS)
456   quiet_cmd_link_o_target = AR      $@
457 else
458   cmd_make_builtin = $(LD) $(ld_flags) -r -o
459   cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
460   quiet_cmd_link_o_target = LD      $@
461 endif
462
463 # If the list of objects to link is empty, just create an empty built-in.o
464 cmd_link_o_target = $(if $(strip $(obj-y)),\
465                       $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
466                       $(cmd_secanalysis),\
467                       $(cmd_make_empty_builtin) $@)
468
469 $(builtin-target): $(obj-y) FORCE
470         $(call if_changed,link_o_target)
471
472 targets += $(builtin-target)
473 endif # builtin-target
474
475 #
476 # Rule to create modules.order file
477 #
478 # Create commands to either record .ko file or cat modules.order from
479 # a subdirectory
480 modorder-cmds =                                         \
481         $(foreach m, $(modorder),                       \
482                 $(if $(filter %/modules.order, $m),     \
483                         cat $m;, echo kernel/$m;))
484
485 $(modorder-target): $(subdir-ym) FORCE
486         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
487
488 #
489 # Rule to compile a set of .o files into one .a file
490 #
491 ifdef lib-target
492 quiet_cmd_link_l_target = AR      $@
493
494 ifdef CONFIG_THIN_ARCHIVES
495   cmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y)
496 else
497   cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
498 endif
499
500 $(lib-target): $(lib-y) FORCE
501         $(call if_changed,link_l_target)
502
503 targets += $(lib-target)
504
505 dummy-object = $(obj)/.lib_exports.o
506 ksyms-lds = $(dot-target).lds
507 ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
508 ref_prefix = EXTERN(_
509 else
510 ref_prefix = EXTERN(
511 endif
512
513 quiet_cmd_export_list = EXPORTS $@
514 cmd_export_list = $(OBJDUMP) -h $< | \
515         sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/$(ref_prefix)\1)/p' >$(ksyms-lds);\
516         rm -f $(dummy-object);\
517         echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\
518         $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
519         rm $(dummy-object) $(ksyms-lds)
520
521 $(obj)/lib-ksyms.o: $(lib-target) FORCE
522         $(call if_changed,export_list)
523
524 targets += $(obj)/lib-ksyms.o
525
526 endif
527
528 #
529 # Rule to link composite objects
530 #
531 #  Composite objects are specified in kbuild makefile as follows:
532 #    <composite-object>-objs := <list of .o files>
533 #  or
534 #    <composite-object>-y    := <list of .o files>
535 #  or
536 #    <composite-object>-m    := <list of .o files>
537 #  The -m syntax only works if <composite object> is a module
538 link_multi_deps =                     \
539 $(filter $(addprefix $(obj)/,         \
540 $($(subst $(obj)/,,$(@:.o=-objs)))    \
541 $($(subst $(obj)/,,$(@:.o=-y)))       \
542 $($(subst $(obj)/,,$(@:.o=-m)))), $^)
543
544 cmd_link_multi-link = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
545
546 ifdef CONFIG_THIN_ARCHIVES
547   quiet_cmd_link_multi-y = AR      $@
548   cmd_link_multi-y = rm -f $@; $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
549 else
550   quiet_cmd_link_multi-y = LD      $@
551   cmd_link_multi-y = $(cmd_link_multi-link)
552 endif
553
554 quiet_cmd_link_multi-m = LD [M]  $@
555 cmd_link_multi-m = $(cmd_link_multi-link)
556
557 $(multi-used-y): FORCE
558         $(call if_changed,link_multi-y)
559 $(call multi_depend, $(multi-used-y), .o, -objs -y)
560
561 $(multi-used-m): FORCE
562         $(call if_changed,link_multi-m)
563         @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
564            $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
565 $(call multi_depend, $(multi-used-m), .o, -objs -y -m)
566
567 targets += $(multi-used-y) $(multi-used-m)
568 targets := $(filter-out $(PHONY), $(targets))
569
570 # Descending
571 # ---------------------------------------------------------------------------
572
573 PHONY += $(subdir-ym)
574 $(subdir-ym):
575         $(Q)$(MAKE) $(build)=$@ need-builtin=$(if $(findstring $@,$(subdir-obj-y)),1)
576
577 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
578 # ---------------------------------------------------------------------------
579
580 PHONY += FORCE
581
582 FORCE:
583
584 # Read all saved command lines and dependencies for the $(targets) we
585 # may be building above, using $(if_changed{,_dep}). As an
586 # optimization, we don't need to read them if the target does not
587 # exist, we will rebuild anyway in that case.
588
589 cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
590
591 ifneq ($(cmd_files),)
592   include $(cmd_files)
593 endif
594
595 ifneq ($(KBUILD_SRC),)
596 # Create directories for object files if they do not exist
597 obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
598 # If cmd_files exist, their directories apparently exist.  Skip mkdir.
599 exist-dirs := $(sort $(patsubst %/,%, $(dir $(cmd_files))))
600 obj-dirs := $(strip $(filter-out $(exist-dirs), $(obj-dirs)))
601 ifneq ($(obj-dirs),)
602 $(shell mkdir -p $(obj-dirs))
603 endif
604 endif
605
606 # Declare the contents of the .PHONY variable as phony.  We keep that
607 # information in a variable se we can use it in if_changed and friends.
608
609 .PHONY: $(PHONY)