xref: /openbmc/u-boot/scripts/Makefile.build (revision 20c700f8) 
1# ==========================================================================
2# Building
3# ==========================================================================
4#
5# SPDX-License-Identifier:	GPL-2.0
6#
7
8# Modified for U-Boot
9prefix := tpl
10src := $(patsubst $(prefix)/%,%,$(obj))
11ifeq ($(obj),$(src))
12prefix := spl
13src := $(patsubst $(prefix)/%,%,$(obj))
14ifeq ($(obj),$(src))
15prefix := .
16endif
17endif
18
19PHONY := __build
20__build:
21
22# Init all relevant variables used in kbuild files so
23# 1) they have correct type
24# 2) they do not inherit any value from the environment
25obj-y :=
26obj-m :=
27lib-y :=
28lib-m :=
29always :=
30targets :=
31subdir-y :=
32subdir-m :=
33EXTRA_AFLAGS   :=
34EXTRA_CFLAGS   :=
35EXTRA_CPPFLAGS :=
36EXTRA_LDFLAGS  :=
37asflags-y  :=
38ccflags-y  :=
39cppflags-y :=
40ldflags-y  :=
41
42subdir-asflags-y :=
43subdir-ccflags-y :=
44
45# Read auto.conf if it exists, otherwise ignore
46# Modified for U-Boot
47-include include/config/auto.conf
48-include $(prefix)/include/autoconf.mk
49include scripts/Makefile.uncmd_spl
50
51include scripts/Kbuild.include
52
53# For backward compatibility check that these variables do not change
54save-cflags := $(CFLAGS)
55
56# The filename Kbuild has precedence over Makefile
57kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
58kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
59include $(kbuild-file)
60
61# Added for U-Boot
62asflags-y  += $(PLATFORM_CPPFLAGS)
63ccflags-y  += $(PLATFORM_CPPFLAGS)
64cppflags-y += $(PLATFORM_CPPFLAGS)
65
66# If the save-* variables changed error out
67ifeq ($(KBUILD_NOPEDANTIC),)
68        ifneq ("$(save-cflags)","$(CFLAGS)")
69                $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
70        endif
71endif
72
73include scripts/Makefile.lib
74
75ifdef host-progs
76ifneq ($(hostprogs-y),$(host-progs))
77$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
78hostprogs-y += $(host-progs)
79endif
80endif
81
82# Do not include host rules unless needed
83ifneq ($(hostprogs-y)$(hostprogs-m),)
84include scripts/Makefile.host
85endif
86
87# Uncommented for U-Boot
88#  We need to create output dicrectory for SPL and TPL even for in-tree build
89#ifneq ($(KBUILD_SRC),)
90# Create output directory if not already present
91_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
92
93# Create directories for object files if directory does not exist
94# Needed when obj-y := dir/file.o syntax is used
95_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
96#endif
97
98ifndef obj
99$(warning kbuild: Makefile.build is included improperly)
100endif
101
102# ===========================================================================
103
104ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
105lib-target := $(obj)/lib.a
106endif
107
108ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
109builtin-target := $(obj)/built-in.o
110endif
111
112modorder-target := $(obj)/modules.order
113
114# We keep a list of all modules in $(MODVERDIR)
115
116__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
117	 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
118	 $(subdir-ym) $(always)
119	@:
120
121# Linus' kernel sanity checking tool
122ifneq ($(KBUILD_CHECKSRC),0)
123  ifeq ($(KBUILD_CHECKSRC),2)
124    quiet_cmd_force_checksrc = CHECK   $<
125          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
126  else
127      quiet_cmd_checksrc     = CHECK   $<
128            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
129  endif
130endif
131
132# Do section mismatch analysis for each module/built-in.o
133ifdef CONFIG_DEBUG_SECTION_MISMATCH
134  cmd_secanalysis = ; scripts/mod/modpost $@
135endif
136
137# Compile C sources (.c)
138# ---------------------------------------------------------------------------
139
140# Default is built-in, unless we know otherwise
141modkern_cflags =                                          \
142	$(if $(part-of-module),                           \
143		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
144		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
145quiet_modtag := $(empty)   $(empty)
146
147$(real-objs-m)        : part-of-module := y
148$(real-objs-m:.o=.i)  : part-of-module := y
149$(real-objs-m:.o=.s)  : part-of-module := y
150$(real-objs-m:.o=.lst): part-of-module := y
151
152$(real-objs-m)        : quiet_modtag := [M]
153$(real-objs-m:.o=.i)  : quiet_modtag := [M]
154$(real-objs-m:.o=.s)  : quiet_modtag := [M]
155$(real-objs-m:.o=.lst): quiet_modtag := [M]
156
157$(obj-m)              : quiet_modtag := [M]
158
159# Default for not multi-part modules
160modname = $(basetarget)
161
162$(multi-objs-m)         : modname = $(modname-multi)
163$(multi-objs-m:.o=.i)   : modname = $(modname-multi)
164$(multi-objs-m:.o=.s)   : modname = $(modname-multi)
165$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
166$(multi-objs-y)         : modname = $(modname-multi)
167$(multi-objs-y:.o=.i)   : modname = $(modname-multi)
168$(multi-objs-y:.o=.s)   : modname = $(modname-multi)
169$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
170
171quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
172cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
173
174$(obj)/%.s: $(src)/%.c FORCE
175	$(call if_changed_dep,cc_s_c)
176
177quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
178cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
179
180$(obj)/%.i: $(src)/%.c FORCE
181	$(call if_changed_dep,cc_i_c)
182
183cmd_gensymtypes =                                                           \
184    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
185    $(GENKSYMS) $(if $(1), -T $(2))                                         \
186     $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
187     $(if $(KBUILD_PRESERVE),-p)                                            \
188     -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
189
190quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
191cmd_cc_symtypes_c =                                                         \
192    set -e;                                                                 \
193    $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
194    test -s $@ || rm -f $@
195
196$(obj)/%.symtypes : $(src)/%.c FORCE
197	$(call cmd,cc_symtypes_c)
198
199# C (.c) files
200# The C file is compiled and updated dependency information is generated.
201# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
202
203quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@
204
205ifndef CONFIG_MODVERSIONS
206cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
207
208else
209# When module versioning is enabled the following steps are executed:
210# o compile a .tmp_<file>.o from <file>.c
211# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
212#   not export symbols, we just rename .tmp_<file>.o to <file>.o and
213#   are done.
214# o otherwise, we calculate symbol versions using the good old
215#   genksyms on the preprocessed source and postprocess them in a way
216#   that they are usable as a linker script
217# o generate <file>.o from .tmp_<file>.o using the linker to
218#   replace the unresolved symbols __crc_exported_symbol with
219#   the actual value of the checksum generated by genksyms
220
221cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
222cmd_modversions =								\
223	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then		\
224		$(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))	\
225		    > $(@D)/.tmp_$(@F:.o=.ver);					\
226										\
227		$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) 			\
228			-T $(@D)/.tmp_$(@F:.o=.ver);				\
229		rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);		\
230	else									\
231		mv -f $(@D)/.tmp_$(@F) $@;					\
232	fi;
233endif
234
235ifdef CONFIG_FTRACE_MCOUNT_RECORD
236ifdef BUILD_C_RECORDMCOUNT
237ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
238  RECORDMCOUNT_FLAGS = -w
239endif
240# Due to recursion, we must skip empty.o.
241# The empty.o file is created in the make process in order to determine
242#  the target endianness and word size. It is made before all other C
243#  files, including recordmcount.
244sub_cmd_record_mcount =					\
245	if [ $(@) != "scripts/mod/empty.o" ]; then	\
246		$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";	\
247	fi;
248recordmcount_source := $(srctree)/scripts/recordmcount.c \
249		    $(srctree)/scripts/recordmcount.h
250else
251sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
252	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
253	"$(if $(CONFIG_64BIT),64,32)" \
254	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
255	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
256	"$(if $(part-of-module),1,0)" "$(@)";
257recordmcount_source := $(srctree)/scripts/recordmcount.pl
258endif
259cmd_record_mcount =						\
260	if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =	\
261	     "$(CC_FLAGS_FTRACE)" ]; then			\
262		$(sub_cmd_record_mcount)			\
263	fi;
264endif
265
266define rule_cc_o_c
267	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
268	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);				  \
269	$(cmd_modversions)						  \
270	$(call echo-cmd,record_mcount)					  \
271	$(cmd_record_mcount)						  \
272	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
273	                                              $(dot-target).tmp;  \
274	rm -f $(depfile);						  \
275	mv -f $(dot-target).tmp $(dot-target).cmd
276endef
277
278# Built-in and composite module parts
279$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
280	$(call cmd,force_checksrc)
281	$(call if_changed_rule,cc_o_c)
282
283# Single-part modules are special since we need to mark them in $(MODVERDIR)
284
285$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
286	$(call cmd,force_checksrc)
287	$(call if_changed_rule,cc_o_c)
288	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
289
290quiet_cmd_cc_lst_c = MKLST   $@
291      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
292		     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
293				     System.map $(OBJDUMP) > $@
294
295$(obj)/%.lst: $(src)/%.c FORCE
296	$(call if_changed_dep,cc_lst_c)
297
298# Compile assembler sources (.S)
299# ---------------------------------------------------------------------------
300
301modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
302
303$(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
304$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
305
306quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
307cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<
308
309$(obj)/%.s: $(src)/%.S FORCE
310	$(call if_changed_dep,as_s_S)
311
312quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
313cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
314
315$(obj)/%.o: $(src)/%.S FORCE
316	$(call if_changed_dep,as_o_S)
317
318targets += $(real-objs-y) $(real-objs-m) $(lib-y)
319targets += $(extra-y) $(MAKECMDGOALS) $(always)
320
321# Linker scripts preprocessor (.lds.S -> .lds)
322# ---------------------------------------------------------------------------
323quiet_cmd_cpp_lds_S = LDS     $@
324      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
325	                     -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
326
327$(obj)/%.lds: $(src)/%.lds.S FORCE
328	$(call if_changed_dep,cpp_lds_S)
329
330# ASN.1 grammar
331# ---------------------------------------------------------------------------
332quiet_cmd_asn1_compiler = ASN.1   $@
333      cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
334				$(subst .h,.c,$@) $(subst .c,.h,$@)
335
336.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
337
338$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
339	$(call cmd,asn1_compiler)
340
341# Build the compiled-in targets
342# ---------------------------------------------------------------------------
343
344# To build objects in subdirs, we need to descend into the directories
345$(sort $(subdir-obj-y)): $(subdir-ym) ;
346
347#
348# Rule to compile a set of .o files into one .o file
349#
350ifdef builtin-target
351quiet_cmd_link_o_target = LD      $@
352# If the list of objects to link is empty, just create an empty built-in.o
353cmd_link_o_target = $(if $(strip $(obj-y)),\
354		      $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
355		      $(cmd_secanalysis),\
356		      rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
357
358$(builtin-target): $(obj-y) FORCE
359	$(call if_changed,link_o_target)
360
361targets += $(builtin-target)
362endif # builtin-target
363
364#
365# Rule to create modules.order file
366#
367# Create commands to either record .ko file or cat modules.order from
368# a subdirectory
369modorder-cmds =						\
370	$(foreach m, $(modorder),			\
371		$(if $(filter %/modules.order, $m),	\
372			cat $m;, echo kernel/$m;))
373
374$(modorder-target): $(subdir-ym) FORCE
375	$(Q)(cat /dev/null; $(modorder-cmds)) > $@
376
377#
378# Rule to compile a set of .o files into one .a file
379#
380ifdef lib-target
381quiet_cmd_link_l_target = AR      $@
382cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
383
384$(lib-target): $(lib-y) FORCE
385	$(call if_changed,link_l_target)
386
387targets += $(lib-target)
388endif
389
390#
391# Rule to link composite objects
392#
393#  Composite objects are specified in kbuild makefile as follows:
394#    <composite-object>-objs := <list of .o files>
395#  or
396#    <composite-object>-y    := <list of .o files>
397link_multi_deps =                     \
398$(filter $(addprefix $(obj)/,         \
399$($(subst $(obj)/,,$(@:.o=-objs)))    \
400$($(subst $(obj)/,,$(@:.o=-y)))), $^)
401
402quiet_cmd_link_multi-y = LD      $@
403cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
404
405quiet_cmd_link_multi-m = LD [M]  $@
406cmd_link_multi-m = $(cmd_link_multi-y)
407
408$(multi-used-y): FORCE
409	$(call if_changed,link_multi-y)
410$(call multi_depend, $(multi-used-y), .o, -objs -y)
411
412$(multi-used-m): FORCE
413	$(call if_changed,link_multi-m)
414	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
415$(call multi_depend, $(multi-used-m), .o, -objs -y)
416
417targets += $(multi-used-y) $(multi-used-m)
418
419
420# Descending
421# ---------------------------------------------------------------------------
422
423PHONY += $(subdir-ym)
424$(subdir-ym):
425	$(Q)$(MAKE) $(build)=$@
426
427# Add FORCE to the prequisites of a target to force it to be always rebuilt.
428# ---------------------------------------------------------------------------
429
430PHONY += FORCE
431
432FORCE:
433
434# Read all saved command lines and dependencies for the $(targets) we
435# may be building above, using $(if_changed{,_dep}). As an
436# optimization, we don't need to read them if the target does not
437# exist, we will rebuild anyway in that case.
438
439targets := $(wildcard $(sort $(targets)))
440cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
441
442ifneq ($(cmd_files),)
443  include $(cmd_files)
444endif
445
446# Declare the contents of the .PHONY variable as phony.  We keep that
447# information in a variable se we can use it in if_changed and friends.
448
449.PHONY: $(PHONY)
450