Merge branch '2021-05-24-add-lto-support'
[platform/kernel/u-boot.git] / scripts / Makefile.build
1 # SPDX-License-Identifier: GPL-2.0
2 # ==========================================================================
3 # Building
4 # ==========================================================================
5
6 # Modified for U-Boot
7 prefix := tpl
8 src := $(patsubst $(prefix)/%,%,$(obj))
9 ifeq ($(obj),$(src))
10 prefix := spl
11 src := $(patsubst $(prefix)/%,%,$(obj))
12 ifeq ($(obj),$(src))
13 prefix := .
14 endif
15 endif
16
17 PHONY := __build
18 __build:
19
20 # Init all relevant variables used in kbuild files so
21 # 1) they have correct type
22 # 2) they do not inherit any value from the environment
23 obj-y :=
24 obj-m :=
25 lib-y :=
26 lib-m :=
27 always :=
28 targets :=
29 subdir-y :=
30 subdir-m :=
31 EXTRA_AFLAGS   :=
32 EXTRA_CFLAGS   :=
33 EXTRA_CPPFLAGS :=
34 EXTRA_LDFLAGS  :=
35 asflags-y  :=
36 ccflags-y  :=
37 cppflags-y :=
38 ldflags-y  :=
39
40 subdir-asflags-y :=
41 subdir-ccflags-y :=
42
43 # Read auto.conf if it exists, otherwise ignore
44 # Modified for U-Boot
45 -include include/config/auto.conf
46 -include $(prefix)/include/autoconf.mk
47 include scripts/Makefile.uncmd_spl
48
49 include scripts/Kbuild.include
50
51 # For backward compatibility check that these variables do not change
52 save-cflags := $(CFLAGS)
53
54 # The filename Kbuild has precedence over Makefile
55 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
56 kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
57 include $(kbuild-file)
58
59 # Added for U-Boot
60 asflags-y  += $(PLATFORM_CPPFLAGS)
61 ccflags-y  += $(PLATFORM_CPPFLAGS)
62 cppflags-y += $(PLATFORM_CPPFLAGS)
63
64 # If the save-* variables changed error out
65 ifeq ($(KBUILD_NOPEDANTIC),)
66         ifneq ("$(save-cflags)","$(CFLAGS)")
67                 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
68         endif
69 endif
70
71 include scripts/Makefile.lib
72
73 # Do not include host rules unless needed
74 ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
75 include scripts/Makefile.host
76 endif
77
78 ifndef obj
79 $(warning kbuild: Makefile.build is included improperly)
80 endif
81
82 # ===========================================================================
83
84 ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
85 lib-target := $(obj)/lib.a
86 endif
87
88 ifneq ($(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_cc_i_c = CPP $(quiet_modtag) $@
158 cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
159
160 $(obj)/%.i: $(src)/%.c FORCE
161         $(call if_changed_dep,cc_i_c)
162
163 cmd_gensymtypes =                                                           \
164     $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
165     $(GENKSYMS) $(if $(1), -T $(2))                                         \
166      $(if $(KBUILD_PRESERVE),-p)                                            \
167      -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
168
169 quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
170 cmd_cc_symtypes_c =                                                         \
171     set -e;                                                                 \
172     $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
173     test -s $@ || rm -f $@
174
175 $(obj)/%.symtypes : $(src)/%.c FORCE
176         $(call cmd,cc_symtypes_c)
177
178 # C (.c) files
179 # The C file is compiled and updated dependency information is generated.
180 # (See cmd_cc_o_c + relevant part of rule_cc_o_c)
181
182 quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
183
184 ifndef CONFIG_MODVERSIONS
185 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
186
187 else
188 # When module versioning is enabled the following steps are executed:
189 # o compile a .tmp_<file>.o from <file>.c
190 # o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
191 #   not export symbols, we just rename .tmp_<file>.o to <file>.o and
192 #   are done.
193 # o otherwise, we calculate symbol versions using the good old
194 #   genksyms on the preprocessed source and postprocess them in a way
195 #   that they are usable as a linker script
196 # o generate <file>.o from .tmp_<file>.o using the linker to
197 #   replace the unresolved symbols __crc_exported_symbol with
198 #   the actual value of the checksum generated by genksyms
199
200 cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
201 cmd_modversions =                                                               \
202         if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then             \
203                 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))    \
204                     > $(@D)/.tmp_$(@F:.o=.ver);                                 \
205                                                                                 \
206                 $(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F)               \
207                         -T $(@D)/.tmp_$(@F:.o=.ver);                            \
208                 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);                \
209         else                                                                    \
210                 mv -f $(@D)/.tmp_$(@F) $@;                                      \
211         fi;
212 endif
213
214 ifdef CONFIG_FTRACE_MCOUNT_RECORD
215 # gcc 5 supports generating the mcount tables directly
216 ifneq ($(call cc-option,-mrecord-mcount,y),y)
217 KBUILD_CFLAGS += -mrecord-mcount
218 else
219 # else do it all manually
220 ifdef BUILD_C_RECORDMCOUNT
221 ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
222   RECORDMCOUNT_FLAGS = -w
223 endif
224 # Due to recursion, we must skip empty.o.
225 # The empty.o file is created in the make process in order to determine
226 #  the target endianness and word size. It is made before all other C
227 #  files, including recordmcount.
228 sub_cmd_record_mcount =                                 \
229         if [ $(@) != "scripts/mod/empty.o" ]; then      \
230                 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";   \
231         fi;
232 recordmcount_source := $(srctree)/scripts/recordmcount.c \
233                     $(srctree)/scripts/recordmcount.h
234 else
235 sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
236         "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
237         "$(if $(CONFIG_64BIT),64,32)" \
238         "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
239         "$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
240         "$(if $(part-of-module),1,0)" "$(@)";
241 recordmcount_source := $(srctree)/scripts/recordmcount.pl
242 endif
243 cmd_record_mcount =                                             \
244         if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =   \
245              "$(CC_FLAGS_FTRACE)" ]; then                       \
246                 $(sub_cmd_record_mcount)                        \
247         fi;
248 endif # -record-mcount
249 endif
250
251 define rule_cc_o_c
252         $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
253         $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                            \
254         $(cmd_modversions)                                                \
255         $(call echo-cmd,record_mcount)                                    \
256         $(cmd_record_mcount)                                              \
257         scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
258                                                       $(dot-target).tmp;  \
259         rm -f $(depfile);                                                 \
260         mv -f $(dot-target).tmp $(dot-target).cmd
261 endef
262
263 # Built-in and composite module parts
264 $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
265         $(call cmd,force_checksrc)
266         $(call if_changed_rule,cc_o_c)
267
268 # Single-part modules are special since we need to mark them in $(MODVERDIR)
269
270 $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
271         $(call cmd,force_checksrc)
272         $(call if_changed_rule,cc_o_c)
273         @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
274
275 quiet_cmd_cc_lst_c = MKLST   $@
276       cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
277                      $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
278                                      System.map $(OBJDUMP) > $@
279
280 $(obj)/%.lst: $(src)/%.c FORCE
281         $(call if_changed_dep,cc_lst_c)
282
283 # Compile assembler sources (.S)
284 # ---------------------------------------------------------------------------
285
286 modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
287
288 $(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
289 $(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
290
291 quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
292 cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
293
294 $(obj)/%.s: $(src)/%.S FORCE
295         $(call if_changed_dep,as_s_S)
296
297 quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
298 cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
299
300 $(obj)/%.o: $(src)/%.S FORCE
301         $(call if_changed_dep,as_o_S)
302
303 targets += $(real-objs-y) $(real-objs-m) $(lib-y)
304 targets += $(extra-y) $(MAKECMDGOALS) $(always)
305
306 # Linker scripts preprocessor (.lds.S -> .lds)
307 # ---------------------------------------------------------------------------
308 quiet_cmd_cpp_lds_S = LDS     $@
309       cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
310                              -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
311
312 $(obj)/%.lds: $(src)/%.lds.S FORCE
313         $(call if_changed_dep,cpp_lds_S)
314
315 # ASN.1 grammar
316 # ---------------------------------------------------------------------------
317 quiet_cmd_asn1_compiler = ASN.1   $@
318       cmd_asn1_compiler = $(objtree)/tools/asn1_compiler $< \
319                                 $(subst .h,.c,$@) $(subst .c,.h,$@)
320
321 $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/tools/asn1_compiler
322         $(call cmd,asn1_compiler)
323
324 # Build the compiled-in targets
325 # ---------------------------------------------------------------------------
326
327 # To build objects in subdirs, we need to descend into the directories
328 $(sort $(subdir-obj-y)): $(subdir-ym) ;
329
330 #
331 # Rule to compile a set of .o files into one .o file
332 #
333 ifdef builtin-target
334 quiet_cmd_link_o_target = AR      $@
335 # If the list of objects to link is empty, just create an empty built-in.o
336 cmd_link_o_target = $(if $(strip $(obj-y)),\
337                       rm -f $@; $(AR) cDPrsT $@ $(filter $(obj-y), $^), \
338                       rm -f $@; $(AR) cDPrsT$(KBUILD_ARFLAGS) $@)
339
340 $(builtin-target): $(obj-y) FORCE
341         $(call if_changed,link_o_target)
342
343 targets += $(builtin-target)
344 endif # builtin-target
345
346 #
347 # Rule to create modules.order file
348 #
349 # Create commands to either record .ko file or cat modules.order from
350 # a subdirectory
351 modorder-cmds =                                         \
352         $(foreach m, $(modorder),                       \
353                 $(if $(filter %/modules.order, $m),     \
354                         cat $m;, echo kernel/$m;))
355
356 $(modorder-target): $(subdir-ym) FORCE
357         $(Q)(cat /dev/null; $(modorder-cmds)) > $@
358
359 #
360 # Rule to compile a set of .o files into one .a file
361 #
362 ifdef lib-target
363 quiet_cmd_link_l_target = AR      $@
364 cmd_link_l_target = rm -f $@; $(AR) cDPrsT$(KBUILD_ARFLAGS) $@ $(lib-y)
365
366 $(lib-target): $(lib-y) FORCE
367         $(call if_changed,link_l_target)
368
369 targets += $(lib-target)
370 endif
371
372 #
373 # Rule to link composite objects
374 #
375 #  Composite objects are specified in kbuild makefile as follows:
376 #    <composite-object>-objs := <list of .o files>
377 #  or
378 #    <composite-object>-y    := <list of .o files>
379 link_multi_deps =                     \
380 $(filter $(addprefix $(obj)/,         \
381 $($(subst $(obj)/,,$(@:.o=-objs)))    \
382 $($(subst $(obj)/,,$(@:.o=-y)))), $^)
383
384
385 quiet_cmd_link_multi-y = AR      $@
386 cmd_link_multi-y = rm -f $@; $(AR) cDPrsT$(KBUILD_ARFLAGS) $@ $(link_multi_deps)
387
388 quiet_cmd_link_multi-m = AR [M]  $@
389 cmd_link_multi-m = $(cmd_link_multi-y)
390
391 $(multi-used-y): FORCE
392         $(call if_changed,link_multi-y)
393 $(call multi_depend, $(multi-used-y), .o, -objs -y)
394
395 $(multi-used-m): FORCE
396         $(call if_changed,link_multi-m)
397         @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
398 $(call multi_depend, $(multi-used-m), .o, -objs -y)
399
400 targets += $(multi-used-y) $(multi-used-m)
401
402
403 # Add intermediate targets:
404 # When building objects with specific suffix patterns, add intermediate
405 # targets that the final targets are derived from.
406 intermediate_targets = $(foreach sfx, $(2), \
407                                 $(patsubst %$(strip $(1)),%$(sfx), \
408                                         $(filter %$(strip $(1)), $(targets))))
409 # %.lex.o <- %.lex.c <- %.l
410 # %.tab.o <- %.tab.[ch] <- %.y
411 targets += $(call intermediate_targets, .lex.o, .lex.c) \
412            $(call intermediate_targets, .tab.o, .tab.c .tab.h)
413
414 # Descending
415 # ---------------------------------------------------------------------------
416
417 PHONY += $(subdir-ym)
418 $(subdir-ym):
419         $(Q)$(MAKE) $(build)=$@
420
421 # Add FORCE to the prequisites of a target to force it to be always rebuilt.
422 # ---------------------------------------------------------------------------
423
424 PHONY += FORCE
425
426 FORCE:
427
428 # Read all saved command lines and dependencies for the $(targets) we
429 # may be building above, using $(if_changed{,_dep}). As an
430 # optimization, we don't need to read them if the target does not
431 # exist, we will rebuild anyway in that case.
432
433 cmd_files := $(wildcard $(foreach f,$(sort $(targets)),$(dir $(f)).$(notdir $(f)).cmd))
434
435 ifneq ($(cmd_files),)
436   include $(cmd_files)
437 endif
438
439 # Create directories for object files if they do not exist
440 obj-dirs := $(sort $(obj) $(patsubst %/,%, $(dir $(targets))))
441 $(shell mkdir -p $(obj-dirs))
442
443 .PHONY: $(PHONY)