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Linus Torvalds1da177e2005-04-16 15:20:36 -07001# ==========================================================================
2# Building
3# ==========================================================================
4
5src := $(obj)
6
Paul Smith4f193362006-03-05 17:14:10 -05007PHONY := __build
Linus Torvalds1da177e2005-04-16 15:20:36 -07008__build:
9
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020010# 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
13obj-y :=
14obj-m :=
15lib-y :=
16lib-m :=
17always :=
18targets :=
19subdir-y :=
20subdir-m :=
21EXTRA_AFLAGS :=
22EXTRA_CFLAGS :=
23EXTRA_CPPFLAGS :=
24EXTRA_LDFLAGS :=
Sam Ravnborgf77bf012007-10-15 22:25:06 +020025asflags-y :=
26ccflags-y :=
27cppflags-y :=
28ldflags-y :=
Sam Ravnborgd72e5ed2007-05-28 22:47:48 +020029
Sam Ravnborg720097d2009-04-19 11:04:26 +020030subdir-asflags-y :=
31subdir-ccflags-y :=
32
Robert P. J. Day3156fd02008-02-18 04:48:20 -050033# Read auto.conf if it exists, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070034-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Sam Ravnborg20a468b2006-01-22 13:34:15 +010036include scripts/Kbuild.include
37
Robert P. J. Day3156fd02008-02-18 04:48:20 -050038# For backward compatibility check that these variables do not change
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020039save-cflags := $(CFLAGS)
40
Sam Ravnborg2a691472005-07-25 20:26:04 +000041# The filename Kbuild has precedence over Makefile
Sam Ravnborgdb8c1a72005-07-27 22:11:01 +020042kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020043kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44include $(kbuild-file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020046# If the save-* variables changed error out
47ifeq ($(KBUILD_NOPEDANTIC),)
48 ifneq ("$(save-cflags)","$(CFLAGS)")
Arnaud Lacombe49c57d22011-08-15 01:07:13 -040049 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020050 endif
51endif
Borislav Petkov4a5838a2011-03-01 09:35:29 +010052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053include scripts/Makefile.lib
54
55ifdef host-progs
56ifneq ($(hostprogs-y),$(host-progs))
57$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
58hostprogs-y += $(host-progs)
59endif
60endif
61
Robert P. J. Day3156fd02008-02-18 04:48:20 -050062# Do not include host rules unless needed
Linus Torvalds1da177e2005-04-16 15:20:36 -070063ifneq ($(hostprogs-y)$(hostprogs-m),)
64include scripts/Makefile.host
65endif
66
67ifneq ($(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 $(d)))
74endif
75
Linus Torvalds1da177e2005-04-16 15:20:36 -070076ifndef obj
77$(warning kbuild: Makefile.build is included improperly)
78endif
79
80# ===========================================================================
81
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090082ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070083lib-target := $(obj)/lib.a
84endif
85
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090086ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087builtin-target := $(obj)/built-in.o
88endif
89
Tejun Heo551559e2007-12-07 21:04:30 +090090modorder-target := $(obj)/modules.order
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092# We keep a list of all modules in $(MODVERDIR)
93
94__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +090095 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 $(subdir-ym) $(always)
97 @:
98
99# Linus' kernel sanity checking tool
100ifneq ($(KBUILD_CHECKSRC),0)
101 ifeq ($(KBUILD_CHECKSRC),2)
102 quiet_cmd_force_checksrc = CHECK $<
103 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
104 else
105 quiet_cmd_checksrc = CHECK $<
106 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
107 endif
108endif
109
Sam Ravnborg91341d42008-01-21 21:31:44 +0100110# Do section mismatch analysis for each module/built-in.o
111ifdef CONFIG_DEBUG_SECTION_MISMATCH
112 cmd_secanalysis = ; scripts/mod/modpost $@
113endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114
115# Compile C sources (.c)
116# ---------------------------------------------------------------------------
117
118# Default is built-in, unless we know otherwise
Sam Ravnborg65881692010-07-28 17:33:09 +0200119modkern_cflags = \
120 $(if $(part-of-module), \
121 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200122 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123quiet_modtag := $(empty) $(empty)
124
Shaohua Li18c167f2009-01-12 10:00:51 +0800125$(real-objs-m) : part-of-module := y
126$(real-objs-m:.o=.i) : part-of-module := y
127$(real-objs-m:.o=.s) : part-of-module := y
128$(real-objs-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
130$(real-objs-m) : quiet_modtag := [M]
131$(real-objs-m:.o=.i) : quiet_modtag := [M]
132$(real-objs-m:.o=.s) : quiet_modtag := [M]
133$(real-objs-m:.o=.lst): quiet_modtag := [M]
134
135$(obj-m) : quiet_modtag := [M]
136
137# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200138modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140$(multi-objs-m) : modname = $(modname-multi)
141$(multi-objs-m:.o=.i) : modname = $(modname-multi)
142$(multi-objs-m:.o=.s) : modname = $(modname-multi)
143$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
144$(multi-objs-y) : modname = $(modname-multi)
145$(multi-objs-y:.o=.i) : modname = $(modname-multi)
146$(multi-objs-y:.o=.s) : modname = $(modname-multi)
147$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
148
149quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Andi Kleen1e64ff42014-02-08 09:01:15 +0100150cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Sam Ravnborg767e5812007-05-06 09:23:45 +0200152$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 $(call if_changed_dep,cc_s_c)
154
155quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
156cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
157
Sam Ravnborg767e5812007-05-06 09:23:45 +0200158$(obj)/%.i: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 $(call if_changed_dep,cc_i_c)
160
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100161cmd_gensymtypes = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100162 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
James Hogand70f82a2013-03-18 19:38:56 +1030163 $(GENKSYMS) $(if $(1), -T $(2)) \
164 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100165 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400166 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100167
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200168quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100169cmd_cc_symtypes_c = \
170 set -e; \
Don Zickuse26d6b82010-05-24 17:07:24 -0400171 $(call cmd_gensymtypes,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100172 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200173
Sam Ravnborg767e5812007-05-06 09:23:45 +0200174$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800175 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200176
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177# C (.c) files
178# The C file is compiled and updated dependency information is generated.
179# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
180
181quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
182
183ifndef CONFIG_MODVERSIONS
184cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
185
186else
187# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100188# o compile a .tmp_<file>.o from <file>.c
189# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
190# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191# are done.
192# o otherwise, we calculate symbol versions using the good old
193# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100194# that they are usable as a linker script
195# o generate <file>.o from .tmp_<file>.o using the linker to
196# replace the unresolved symbols __crc_exported_symbol with
197# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100199cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Don Zickuse26d6b82010-05-24 17:07:24 -0400200cmd_modversions = \
201 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
202 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
203 > $(@D)/.tmp_$(@F:.o=.ver); \
204 \
205 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
206 -T $(@D)/.tmp_$(@F:.o=.ver); \
207 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
208 else \
209 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 fi;
211endif
212
Steven Rostedt8da38212008-08-14 15:45:07 -0400213ifdef CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedt72441cb2010-10-13 17:12:30 -0400214ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400215ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
216 RECORDMCOUNT_FLAGS = -w
217endif
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400218# Due to recursion, we must skip empty.o.
219# The empty.o file is created in the make process in order to determine
220# the target endianness and word size. It is made before all other C
221# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800222sub_cmd_record_mcount = \
223 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400224 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800225 fi;
Michal Marekd6971822011-05-17 15:36:46 +0200226recordmcount_source := $(srctree)/scripts/recordmcount.c \
227 $(srctree)/scripts/recordmcount.h
Steven Rostedt72441cb2010-10-13 17:12:30 -0400228else
Wu Zhangjin45677452010-10-28 00:24:34 +0800229sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800230 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400231 "$(if $(CONFIG_64BIT),64,32)" \
Rabin Vincentf9810a82010-08-10 19:39:20 +0100232 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
233 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800234 "$(if $(part-of-module),1,0)" "$(@)";
Michal Marekd6971822011-05-17 15:36:46 +0200235recordmcount_source := $(srctree)/scripts/recordmcount.pl
Steven Rostedt8da38212008-08-14 15:45:07 -0400236endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100237cmd_record_mcount = \
238 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
239 "$(CC_FLAGS_FTRACE)" ]; then \
Wu Zhangjin45677452010-10-28 00:24:34 +0800240 $(sub_cmd_record_mcount) \
241 fi;
Steven Rostedt72441cb2010-10-13 17:12:30 -0400242endif
Steven Rostedt8da38212008-08-14 15:45:07 -0400243
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100245 $(call echo-cmd,checksrc) $(cmd_checksrc) \
246 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 $(cmd_modversions) \
Andi Kleenc3c63b62009-09-18 12:49:36 -0700248 $(call echo-cmd,record_mcount) \
Steven Rostedt8da38212008-08-14 15:45:07 -0400249 $(cmd_record_mcount) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200250 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
251 $(dot-target).tmp; \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100252 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200253 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254endef
255
256# Built-in and composite module parts
Michal Marekd6971822011-05-17 15:36:46 +0200257$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 $(call cmd,force_checksrc)
259 $(call if_changed_rule,cc_o_c)
260
261# Single-part modules are special since we need to mark them in $(MODVERDIR)
262
Michal Marekd6971822011-05-17 15:36:46 +0200263$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 $(call cmd,force_checksrc)
265 $(call if_changed_rule,cc_o_c)
266 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
267
268quiet_cmd_cc_lst_c = MKLST $@
269 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
270 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
271 System.map $(OBJDUMP) > $@
272
Sam Ravnborg767e5812007-05-06 09:23:45 +0200273$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 $(call if_changed_dep,cc_lst_c)
275
276# Compile assembler sources (.S)
277# ---------------------------------------------------------------------------
278
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200279modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280
Sam Ravnborg65881692010-07-28 17:33:09 +0200281$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
282$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
284quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
Masahiro Yamada38385f82014-04-28 16:26:18 +0900285cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
Sam Ravnborg767e5812007-05-06 09:23:45 +0200287$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 $(call if_changed_dep,as_s_S)
289
290quiet_cmd_as_o_S = AS $(quiet_modtag) $@
291cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
292
Sam Ravnborg767e5812007-05-06 09:23:45 +0200293$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 $(call if_changed_dep,as_o_S)
295
296targets += $(real-objs-y) $(real-objs-m) $(lib-y)
297targets += $(extra-y) $(MAKECMDGOALS) $(always)
298
299# Linker scripts preprocessor (.lds.S -> .lds)
300# ---------------------------------------------------------------------------
301quiet_cmd_cpp_lds_S = LDS $@
Sam Ravnborg51b563f2009-09-20 12:28:22 +0200302 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400303 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
Sam Ravnborg767e5812007-05-06 09:23:45 +0200305$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 $(call if_changed_dep,cpp_lds_S)
307
David Howells4520c6a2012-09-21 23:31:13 +0100308# ASN.1 grammar
309# ---------------------------------------------------------------------------
310quiet_cmd_asn1_compiler = ASN.1 $@
311 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
312 $(subst .h,.c,$@) $(subst .c,.h,$@)
313
314.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
315
316$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
317 $(call cmd,asn1_compiler)
318
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319# Build the compiled-in targets
320# ---------------------------------------------------------------------------
321
322# To build objects in subdirs, we need to descend into the directories
323$(sort $(subdir-obj-y)): $(subdir-ym) ;
324
325#
326# Rule to compile a set of .o files into one .o file
327#
328ifdef builtin-target
329quiet_cmd_link_o_target = LD $@
330# If the list of objects to link is empty, just create an empty built-in.o
331cmd_link_o_target = $(if $(strip $(obj-y)),\
Sam Ravnborg91341d42008-01-21 21:31:44 +0100332 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
333 $(cmd_secanalysis),\
Michal Marek40df7592011-04-20 13:45:30 +0200334 rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336$(builtin-target): $(obj-y) FORCE
337 $(call if_changed,link_o_target)
338
339targets += $(builtin-target)
340endif # builtin-target
341
342#
Tejun Heo551559e2007-12-07 21:04:30 +0900343# Rule to create modules.order file
344#
345# Create commands to either record .ko file or cat modules.order from
346# a subdirectory
347modorder-cmds = \
348 $(foreach m, $(modorder), \
349 $(if $(filter %/modules.order, $m), \
350 cat $m;, echo kernel/$m;))
351
352$(modorder-target): $(subdir-ym) FORCE
353 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
354
355#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356# Rule to compile a set of .o files into one .a file
357#
358ifdef lib-target
359quiet_cmd_link_l_target = AR $@
Michal Marek40df7592011-04-20 13:45:30 +0200360cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
362$(lib-target): $(lib-y) FORCE
363 $(call if_changed,link_l_target)
364
365targets += $(lib-target)
366endif
367
368#
369# Rule to link composite objects
370#
371# Composite objects are specified in kbuild makefile as follows:
372# <composite-object>-objs := <list of .o files>
373# or
374# <composite-object>-y := <list of .o files>
Michal Marekcf4f2192015-10-27 14:02:24 +0100375# or
376# <composite-object>-m := <list of .o files>
377# The -m syntax only works if <composite object> is a module
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378link_multi_deps = \
379$(filter $(addprefix $(obj)/, \
380$($(subst $(obj)/,,$(@:.o=-objs))) \
Michal Marekcf4f2192015-10-27 14:02:24 +0100381$($(subst $(obj)/,,$(@:.o=-y))) \
382$($(subst $(obj)/,,$(@:.o=-m)))), $^)
Masahiro Yamada38385f82014-04-28 16:26:18 +0900383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100385cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386
387quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700388cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900390$(multi-used-y): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 $(call if_changed,link_multi-y)
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900392$(call multi_depend, $(multi-used-y), .o, -objs -y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900394$(multi-used-m): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 $(call if_changed,link_multi-m)
396 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
Michal Marekcf4f2192015-10-27 14:02:24 +0100397$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399targets += $(multi-used-y) $(multi-used-m)
400
401
402# Descending
403# ---------------------------------------------------------------------------
404
Paul Smith4f193362006-03-05 17:14:10 -0500405PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406$(subdir-ym):
407 $(Q)$(MAKE) $(build)=$@
408
409# Add FORCE to the prequisites of a target to force it to be always rebuilt.
410# ---------------------------------------------------------------------------
411
Paul Smith4f193362006-03-05 17:14:10 -0500412PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
414FORCE:
415
416# Read all saved command lines and dependencies for the $(targets) we
417# may be building above, using $(if_changed{,_dep}). As an
418# optimization, we don't need to read them if the target does not
419# exist, we will rebuild anyway in that case.
420
421targets := $(wildcard $(sort $(targets)))
422cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
423
424ifneq ($(cmd_files),)
425 include $(cmd_files)
426endif
Paul Smith4f193362006-03-05 17:14:10 -0500427
Paul Smith4f193362006-03-05 17:14:10 -0500428# Declare the contents of the .PHONY variable as phony. We keep that
429# information in a variable se we can use it in if_changed and friends.
430
431.PHONY: $(PHONY)