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1 # ==========================================================================
2 # Building
3 # ==========================================================================
4
5 # Modified for U-Boot
6 prefix := tpl
7 src := $(patsubst $(prefix)/%,%,$(obj))
8 ifeq ($(obj),$(src))
9 prefix := spl
10 src := $(patsubst $(prefix)/%,%,$(obj))
11 ifeq ($(obj),$(src))
12 prefix := .
13 endif
14 endif
15
16 PHONY := __build
17 __build:
18
19 # Init all relevant variables used in kbuild files so
20 # 1) they have correct type
21 # 2) they do not inherit any value from the environment
22 obj-y :=
23 obj-m :=
24 lib-y :=
25 lib-m :=
26 always :=
27 targets :=
28 subdir-y :=
29 subdir-m :=
30 EXTRA_AFLAGS   :=
31 EXTRA_CFLAGS   :=
32 EXTRA_CPPFLAGS :=
33 EXTRA_LDFLAGS  :=
34 asflags-y  :=
35 ccflags-y  :=
36 cppflags-y :=
37 ldflags-y  :=
38
39 subdir-asflags-y :=
40 subdir-ccflags-y :=
41
42 # Read auto.conf if it exists, otherwise ignore
43 # Modified for U-Boot
44 -include $(prefix)/include/config/auto.conf
45 -include $(prefix)/include/autoconf.mk
46
47 include scripts/Kbuild.include
48
49 # For backward compatibility check that these variables do not change
50 save-cflags := $(CFLAGS)
51
52 # The filename Kbuild has precedence over Makefile
53 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
54 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
55 include $(kbuild-file)
56
57 # Added for U-Boot
58 asflags-y  += $(PLATFORM_CPPFLAGS)
59 ccflags-y  += $(PLATFORM_CPPFLAGS)
60 cppflags-y += $(PLATFORM_CPPFLAGS)
61
62 # If the save-* variables changed error out
63 ifeq ($(KBUILD_NOPEDANTIC),)
64         ifneq ("$(save-cflags)","$(CFLAGS)")
65                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
66         endif
67 endif
68
69 #
70 # make W=... settings
71 #
72 # W=1 - warnings that may be relevant and does not occur too often
73 # W=2 - warnings that occur quite often but may still be relevant
74 # W=3 - the more obscure warnings, can most likely be ignored
75 #
76 # $(call cc-option, -W...) handles gcc -W.. options which
77 # are not supported by all versions of the compiler
78 ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
79 warning-  := $(empty)
80
81 warning-1 := -Wextra -Wunused -Wno-unused-parameter
82 warning-1 += -Wmissing-declarations
83 warning-1 += -Wmissing-format-attribute
84 warning-1 += $(call cc-option, -Wmissing-prototypes)
85 warning-1 += -Wold-style-definition
86 warning-1 += $(call cc-option, -Wmissing-include-dirs)
87 warning-1 += $(call cc-option, -Wunused-but-set-variable)
88 warning-1 += $(call cc-disable-warning, missing-field-initializers)
89
90 # Clang
91 warning-1 += $(call cc-disable-warning, initializer-overrides)
92 warning-1 += $(call cc-disable-warning, unused-value)
93 warning-1 += $(call cc-disable-warning, format)
94 warning-1 += $(call cc-disable-warning, unknown-warning-option)
95 warning-1 += $(call cc-disable-warning, sign-compare)
96 warning-1 += $(call cc-disable-warning, format-zero-length)
97 warning-1 += $(call cc-disable-warning, uninitialized)
98 warning-1 += $(call cc-option, -fcatch-undefined-behavior)
99
100 warning-2 := -Waggregate-return
101 warning-2 += -Wcast-align
102 warning-2 += -Wdisabled-optimization
103 warning-2 += -Wnested-externs
104 warning-2 += -Wshadow
105 warning-2 += $(call cc-option, -Wlogical-op)
106 warning-2 += $(call cc-option, -Wmissing-field-initializers)
107
108 warning-3 := -Wbad-function-cast
109 warning-3 += -Wcast-qual
110 warning-3 += -Wconversion
111 warning-3 += -Wpacked
112 warning-3 += -Wpadded
113 warning-3 += -Wpointer-arith
114 warning-3 += -Wredundant-decls
115 warning-3 += -Wswitch-default
116 warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
117 warning-3 += $(call cc-option, -Wvla)
118
119 warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
120 warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
121 warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
122
123 ifeq ("$(strip $(warning))","")
124         $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
125 endif
126
127 KBUILD_CFLAGS += $(warning)
128 endif
129
130 include scripts/Makefile.lib
131
132 ifdef host-progs
133 ifneq ($(hostprogs-y),$(host-progs))
134 $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
135 hostprogs-y += $(host-progs)
136 endif
137 endif
138
139 # Do not include host rules unless needed
140 ifneq ($(hostprogs-y)$(hostprogs-m),)
141 include scripts/Makefile.host
142 endif
143
144 # Uncommented for U-Boot
145 #  We need to create output dicrectory for SPL and TPL even for in-tree build
146 #ifneq ($(KBUILD_SRC),)
147 # Create output directory if not already present
148 _dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
149
150 # Create directories for object files if directory does not exist
151 # Needed when obj-y := dir/file.o syntax is used
152 _dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
153 #endif
154
155 ifndef obj
156 $(warning kbuild: Makefile.build is included improperly)
157 endif
158
159 # ===========================================================================
160
161 ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
162 lib-target := $(obj)/lib.a
163 endif
164
165 ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
166 builtin-target := $(obj)/built-in.o
167 endif
168
169 modorder-target := $(obj)/modules.order
170
171 # We keep a list of all modules in $(MODVERDIR)
172
173 __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
174          $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
175          $(subdir-ym) $(always)
176         @:
177
178 # Linus' kernel sanity checking tool
179 ifneq ($(KBUILD_CHECKSRC),0)
180   ifeq ($(KBUILD_CHECKSRC),2)
181     quiet_cmd_force_checksrc = CHECK   $<
182           cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
183   else
184       quiet_cmd_checksrc     = CHECK   $<
185             cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
186   endif
187 endif
188
189 # Do section mismatch analysis for each module/built-in.o
190 ifdef CONFIG_DEBUG_SECTION_MISMATCH
191   cmd_secanalysis = ; scripts/mod/modpost $@
192 endif
193
194 # Compile C sources (.c)
195 # ---------------------------------------------------------------------------
196
197 # Default is built-in, unless we know otherwise
198 modkern_cflags =                                          \
199         $(if $(part-of-module),                           \
200                 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
201                 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
202 quiet_modtag := $(empty)   $(empty)
203
204 $(real-objs-m)        : part-of-module := y
205 $(real-objs-m:.o=.i)  : part-of-module := y
206 $(real-objs-m:.o=.s)  : part-of-module := y
207 $(real-objs-m:.o=.lst): part-of-module := y
208
209 $(real-objs-m)        : quiet_modtag := [M]
210 $(real-objs-m:.o=.i)  : quiet_modtag := [M]
211 $(real-objs-m:.o=.s)  : quiet_modtag := [M]
212 $(real-objs-m:.o=.lst): quiet_modtag := [M]
213
214 $(obj-m)              : quiet_modtag := [M]
215
216 # Default for not multi-part modules
217 modname = $(basetarget)
218
219 $(multi-objs-m)         : modname = $(modname-multi)
220 $(multi-objs-m:.o=.i)   : modname = $(modname-multi)
221 $(multi-objs-m:.o=.s)   : modname = $(modname-multi)
222 $(multi-objs-m:.o=.lst) : modname = $(modname-multi)
223 $(multi-objs-y)         : modname = $(modname-multi)
224 $(multi-objs-y:.o=.i)   : modname = $(modname-multi)
225 $(multi-objs-y:.o=.s)   : modname = $(modname-multi)
226 $(multi-objs-y:.o=.lst) : modname = $(modname-multi)
227
228 quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
229 cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
230
231 $(obj)/%.s: $(src)/%.c FORCE
232         $(call if_changed_dep,cc_s_c)
233
234 quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
235 cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
236
237 $(obj)/%.i: $(src)/%.c FORCE
238         $(call if_changed_dep,cc_i_c)
239
240 cmd_gensymtypes =                                                           \
241     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
242     $(GENKSYMS) $(if $(1), -T $(2))                                         \
243      $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
244      $(if $(KBUILD_PRESERVE),-p)                                            \
245      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
246
247 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
248 cmd_cc_symtypes_c =                                                         \
249     set -e;                                                                 \
250     $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
251     test -s $@ || rm -f $@
252
253 $(obj)/%.symtypes : $(src)/%.c FORCE
254         $(call cmd,cc_symtypes_c)
255
256 # C (.c) files
257 # The C file is compiled and updated dependency information is generated.
258 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
259
260 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
261
262 ifndef CONFIG_MODVERSIONS
263 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
264
265 else
266 # When module versioning is enabled the following steps are executed:
267 # o compile a .tmp_<file>.o from <file>.c
268 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
269 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
270 #   are done.
271 # o otherwise, we calculate symbol versions using the good old
272 #   genksyms on the preprocessed source and postprocess them in a way
273 #   that they are usable as a linker script
274 # o generate <file>.o from .tmp_<file>.o using the linker to
275 #   replace the unresolved symbols __crc_exported_symbol with
276 #   the actual value of the checksum generated by genksyms
277
278 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
279 cmd_modversions =                                                               \
280         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
281                 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))    \
282                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
283                                                                                 \
284                 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)                      \
285                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
286                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
287         else                                                                    \
288                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
289         fi;
290 endif
291
292 ifdef CONFIG_FTRACE_MCOUNT_RECORD
293 ifdef BUILD_C_RECORDMCOUNT
294 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
295   RECORDMCOUNT_FLAGS = -w
296 endif
297 # Due to recursion, we must skip empty.o.
298 # The empty.o file is created in the make process in order to determine
299 #  the target endianness and word size. It is made before all other C
300 #  files, including recordmcount.
301 sub_cmd_record_mcount =                                 \
302         if [ $(@) != "scripts/mod/empty.o" ]; then      \
303                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
304         fi;
305 recordmcount_source := $(srctree)/scripts/recordmcount.c \
306                     $(srctree)/scripts/recordmcount.h
307 else
308 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
309         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
310         "$(if $(CONFIG_64BIT),64,32)" \
311         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
312         "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
313         "$(if $(part-of-module),1,0)" "$(@)";
314 recordmcount_source := $(srctree)/scripts/recordmcount.pl
315 endif
316 cmd_record_mcount =                                             \
317         if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then    \
318                 $(sub_cmd_record_mcount)                        \
319         fi;
320 endif
321
322 define rule_cc_o_c
323         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
324         $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                            \
325         $(cmd_modversions)                                                \
326         $(call echo-cmd,record_mcount)                                    \
327         $(cmd_record_mcount)                                              \
328         scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
329                                                       $(dot-target).tmp;  \
330         rm -f $(depfile);                                                 \
331         mv -f $(dot-target).tmp $(dot-target).cmd
332 endef
333
334 # Built-in and composite module parts
335 $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
336         $(call cmd,force_checksrc)
337         $(call if_changed_rule,cc_o_c)
338
339 # Single-part modules are special since we need to mark them in $(MODVERDIR)
340
341 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
342         $(call cmd,force_checksrc)
343         $(call if_changed_rule,cc_o_c)
344         @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
345
346 quiet_cmd_cc_lst_c = MKLST   $@
347       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
348                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
349                                      System.map $(OBJDUMP) > $@
350
351 $(obj)/%.lst: $(src)/%.c FORCE
352         $(call if_changed_dep,cc_lst_c)
353
354 # Compile assembler sources (.S)
355 # ---------------------------------------------------------------------------
356
357 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
358
359 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
360 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
361
362 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
363 cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
364
365 $(obj)/%.s: $(src)/%.S FORCE
366         $(call if_changed_dep,as_s_S)
367
368 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
369 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
370
371 $(obj)/%.o: $(src)/%.S FORCE
372         $(call if_changed_dep,as_o_S)
373
374 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
375 targets += $(extra-y) $(MAKECMDGOALS) $(always)
376
377 # Linker scripts preprocessor (.lds.S -> .lds)
378 # ---------------------------------------------------------------------------
379 quiet_cmd_cpp_lds_S = LDS     $@
380       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
381                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
382
383 $(obj)/%.lds: $(src)/%.lds.S FORCE
384         $(call if_changed_dep,cpp_lds_S)
385
386 # ASN.1 grammar
387 # ---------------------------------------------------------------------------
388 quiet_cmd_asn1_compiler = ASN.1   $@
389       cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
390                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
391
392 .PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
393
394 $(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
395         $(call cmd,asn1_compiler)
396
397 # Build the compiled-in targets
398 # ---------------------------------------------------------------------------
399
400 # To build objects in subdirs, we need to descend into the directories
401 $(sort $(subdir-obj-y)): $(subdir-ym) ;
402
403 #
404 # Rule to compile a set of .o files into one .o file
405 #
406 ifdef builtin-target
407 quiet_cmd_link_o_target = LD      $@
408 # If the list of objects to link is empty, just create an empty built-in.o
409 cmd_link_o_target = $(if $(strip $(obj-y)),\
410                       $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
411                       $(cmd_secanalysis),\
412                       rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
413
414 $(builtin-target): $(obj-y) FORCE
415         $(call if_changed,link_o_target)
416
417 targets += $(builtin-target)
418 endif # builtin-target
419
420 #
421 # Rule to create modules.order file
422 #
423 # Create commands to either record .ko file or cat modules.order from
424 # a subdirectory
425 modorder-cmds =                                         \
426         $(foreach m, $(modorder),                       \
427                 $(if $(filter %/modules.order, $m),     \
428                         cat $m;, echo kernel/$m;))
429
430 $(modorder-target): $(subdir-ym) FORCE
431         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
432
433 #
434 # Rule to compile a set of .o files into one .a file
435 #
436 ifdef lib-target
437 quiet_cmd_link_l_target = AR      $@
438 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
439
440 $(lib-target): $(lib-y) FORCE
441         $(call if_changed,link_l_target)
442
443 targets += $(lib-target)
444 endif
445
446 #
447 # Rule to link composite objects
448 #
449 #  Composite objects are specified in kbuild makefile as follows:
450 #    <composite-object>-objs := <list of .o files>
451 #  or
452 #    <composite-object>-y    := <list of .o files>
453 link_multi_deps =                     \
454 $(filter $(addprefix $(obj)/,         \
455 $($(subst $(obj)/,,$(@:.o=-objs)))    \
456 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
457
458 quiet_cmd_link_multi-y = LD      $@
459 cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
460
461 quiet_cmd_link_multi-m = LD [M]  $@
462 cmd_link_multi-m = $(cmd_link_multi-y)
463
464 # We would rather have a list of rules like
465 #       foo.o: $(foo-objs)
466 # but that's not so easy, so we rather make all composite objects depend
467 # on the set of all their parts
468 $(multi-used-y) : %.o: $(multi-objs-y) FORCE
469         $(call if_changed,link_multi-y)
470
471 $(multi-used-m) : %.o: $(multi-objs-m) FORCE
472         $(call if_changed,link_multi-m)
473         @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
474
475 targets += $(multi-used-y) $(multi-used-m)
476
477
478 # Descending
479 # ---------------------------------------------------------------------------
480
481 PHONY += $(subdir-ym)
482 $(subdir-ym):
483         $(Q)$(MAKE) $(build)=$@
484
485 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
486 # ---------------------------------------------------------------------------
487
488 PHONY += FORCE
489
490 FORCE:
491
492 # Read all saved command lines and dependencies for the $(targets) we
493 # may be building above, using $(if_changed{,_dep}). As an
494 # optimization, we don't need to read them if the target does not
495 # exist, we will rebuild anyway in that case.
496
497 targets := $(wildcard $(sort $(targets)))
498 cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
499
500 ifneq ($(cmd_files),)
501   include $(cmd_files)
502 endif
503
504 # Declare the contents of the .PHONY variable as phony.  We keep that
505 # information in a variable se we can use it in if_changed and friends.
506
507 .PHONY: $(PHONY)