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Merge tag 'ceph-for-4.8-rc2' of https://github.com/ceph/ceph-client
[mirror_ubuntu-zesty-kernel.git] / scripts / Makefile.build
CommitLineData
1da177e4
LT
1# ==========================================================================
2# Building
3# ==========================================================================
4
5src := $(obj)
6
4f193362 7PHONY := __build
1da177e4
LT
8__build:
9
d72e5edb
SR
10# 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 :=
f77bf014
SR
25asflags-y :=
26ccflags-y :=
27cppflags-y :=
28ldflags-y :=
d72e5edb 29
720097d8
SR
30subdir-asflags-y :=
31subdir-ccflags-y :=
32
3156fd05 33# Read auto.conf if it exists, otherwise ignore
c955ccaf 34-include include/config/auto.conf
1da177e4 35
20a468b5
SR
36include scripts/Kbuild.include
37
3156fd05 38# For backward compatibility check that these variables do not change
0c53c8e6
SR
39save-cflags := $(CFLAGS)
40
2a691470 41# The filename Kbuild has precedence over Makefile
db8c1a7b 42kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
0c53c8e6
SR
43kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44include $(kbuild-file)
45
46# If the save-* variables changed error out
47ifeq ($(KBUILD_NOPEDANTIC),)
48 ifneq ("$(save-cflags)","$(CFLAGS)")
49c57d25 49 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
0c53c8e6
SR
50 endif
51endif
4a5838ad 52
1da177e4
LT
53include 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 += $(host-progs)
59endif
60endif
61
3156fd05 62# Do not include host rules unless needed
24403874 63ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
1da177e4
LT
64include scripts/Makefile.host
65endif
66
67ifneq ($(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 $(d)))
74endif
75
1da177e4
LT
76ifndef obj
77$(warning kbuild: Makefile.build is included improperly)
78endif
79
80# ===========================================================================
81
a4954fd7 82ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
1da177e4
LT
83lib-target := $(obj)/lib.a
84endif
85
a4954fd7 86ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
1da177e4
LT
87builtin-target := $(obj)/built-in.o
88endif
89
551559e1
TH
90modorder-target := $(obj)/modules.order
91
1da177e4
LT
92# We keep a list of all modules in $(MODVERDIR)
93
94__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
551559e1 95 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
1da177e4
LT
96 $(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
91341d4b
SR
110# Do section mismatch analysis for each module/built-in.o
111ifdef CONFIG_DEBUG_SECTION_MISMATCH
112 cmd_secanalysis = ; scripts/mod/modpost $@
113endif
1da177e4
LT
114
115# Compile C sources (.c)
116# ---------------------------------------------------------------------------
117
118# Default is built-in, unless we know otherwise
6588169d
SR
119modkern_cflags = \
120 $(if $(part-of-module), \
121 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
80c00ba9 122 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
1da177e4
LT
123quiet_modtag := $(empty) $(empty)
124
18c167fd
SL
125$(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$(real-objs-m:.o=.lst): part-of-module := y
1da177e4
LT
129
130$(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
5e8d780d 138modname = $(basetarget)
1da177e4
LT
139
140$(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) $@
1e64ff42 150cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
1da177e4 151
767e581d 152$(obj)/%.s: $(src)/%.c FORCE
1da177e4
LT
153 $(call if_changed_dep,cc_s_c)
154
23d43848
MY
155quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
156cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
1da177e4 157
767e581d 158$(obj)/%.i: $(src)/%.c FORCE
23d43848 159 $(call if_changed_dep,cpp_i_c)
1da177e4 160
2ea03891 161cmd_gensymtypes = \
37a8d9f6 162 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
d70f82ac
JH
163 $(GENKSYMS) $(if $(1), -T $(2)) \
164 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
37a8d9f6 165 $(if $(KBUILD_PRESERVE),-p) \
e26d6b83 166 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
37a8d9f6 167
15fde675 168quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
37a8d9f6
SR
169cmd_cc_symtypes_c = \
170 set -e; \
e26d6b83 171 $(call cmd_gensymtypes,true,$@) >/dev/null; \
37a8d9f6 172 test -s $@ || rm -f $@
15fde675 173
767e581d 174$(obj)/%.symtypes : $(src)/%.c FORCE
64e6c1e1 175 $(call cmd,cc_symtypes_c)
15fde675 176
1da177e4
LT
177# 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:
2ea03891
SR
188# 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
1da177e4
LT
191# 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
2ea03891
SR
194# 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
1da177e4 198
2ea03891 199cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
e26d6b83
DZ
200cmd_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) $@; \
1da177e4
LT
210 fi;
211endif
212
8da3821b 213ifdef CONFIG_FTRACE_MCOUNT_RECORD
72441cb1 214ifdef BUILD_C_RECORDMCOUNT
85356f80
SR
215ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
216 RECORDMCOUNT_FLAGS = -w
217endif
d7b4d6de
SR
218# 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.
45677454
WZ
222sub_cmd_record_mcount = \
223 if [ $(@) != "scripts/mod/empty.o" ]; then \
85356f80 224 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
45677454 225 fi;
d6971822
MM
226recordmcount_source := $(srctree)/scripts/recordmcount.c \
227 $(srctree)/scripts/recordmcount.h
72441cb1 228else
45677454 229sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
e6299d26 230 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
b3acf29a 231 "$(if $(CONFIG_64BIT),64,32)" \
f9810a82
RV
232 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
233 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
18c167fd 234 "$(if $(part-of-module),1,0)" "$(@)";
d6971822 235recordmcount_source := $(srctree)/scripts/recordmcount.pl
8da3821b 236endif
c0a80c0c
HC
237cmd_record_mcount = \
238 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
239 "$(CC_FLAGS_FTRACE)" ]; then \
45677454
WZ
240 $(sub_cmd_record_mcount) \
241 fi;
72441cb1 242endif
8da3821b 243
b9ab5ebb 244ifdef CONFIG_STACK_VALIDATION
3b27a0c8 245ifneq ($(SKIP_STACK_VALIDATION),1)
b9ab5ebb
JP
246
247__objtool_obj := $(objtree)/tools/objtool/objtool
248
249objtool_args = check
250ifndef CONFIG_FRAME_POINTER
251objtool_args += --no-fp
252endif
253
254# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
255# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
256# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
257cmd_objtool = $(if $(patsubst y%,, \
258 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
259 $(__objtool_obj) $(objtool_args) "$(@)";)
260objtool_obj = $(if $(patsubst y%,, \
261 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
262 $(__objtool_obj))
263
3b27a0c8 264endif # SKIP_STACK_VALIDATION
b9ab5ebb
JP
265endif # CONFIG_STACK_VALIDATION
266
1da177e4 267define rule_cc_o_c
6176aa9a 268 $(call echo-cmd,checksrc) $(cmd_checksrc) \
e4aca459 269 $(call cmd_and_fixdep,cc_o_c) \
1da177e4 270 $(cmd_modversions) \
e4aca459
NP
271 $(cmd_objtool) \
272 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
1da177e4
LT
273endef
274
b9ab5ebb 275define rule_as_o_S
e4aca459
NP
276 $(call cmd_and_fixdep,as_o_S) \
277 $(cmd_objtool)
b9ab5ebb
JP
278endef
279
9895c03d
NP
280# List module undefined symbols (or empty line if not enabled)
281ifdef CONFIG_TRIM_UNUSED_KSYMS
282cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
283else
284cmd_undef_syms = echo
285endif
286
1da177e4 287# Built-in and composite module parts
b9ab5ebb 288$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
1da177e4
LT
289 $(call cmd,force_checksrc)
290 $(call if_changed_rule,cc_o_c)
291
292# Single-part modules are special since we need to mark them in $(MODVERDIR)
293
b9ab5ebb 294$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
1da177e4
LT
295 $(call cmd,force_checksrc)
296 $(call if_changed_rule,cc_o_c)
9895c03d
NP
297 @{ echo $(@:.o=.ko); echo $@; \
298 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
1da177e4
LT
299
300quiet_cmd_cc_lst_c = MKLST $@
301 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
302 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
303 System.map $(OBJDUMP) > $@
304
767e581d 305$(obj)/%.lst: $(src)/%.c FORCE
1da177e4
LT
306 $(call if_changed_dep,cc_lst_c)
307
308# Compile assembler sources (.S)
309# ---------------------------------------------------------------------------
310
80c00ba9 311modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
1da177e4 312
6588169d
SR
313$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
314$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
1da177e4 315
e0f41e52
MY
316quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
317cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
1da177e4 318
767e581d 319$(obj)/%.s: $(src)/%.S FORCE
e0f41e52 320 $(call if_changed_dep,cpp_s_S)
1da177e4
LT
321
322quiet_cmd_as_o_S = AS $(quiet_modtag) $@
323cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
324
b9ab5ebb
JP
325$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
326 $(call if_changed_rule,as_o_S)
1da177e4
LT
327
328targets += $(real-objs-y) $(real-objs-m) $(lib-y)
329targets += $(extra-y) $(MAKECMDGOALS) $(always)
330
331# Linker scripts preprocessor (.lds.S -> .lds)
332# ---------------------------------------------------------------------------
333quiet_cmd_cpp_lds_S = LDS $@
51b563fc 334 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
42f29a25 335 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
1da177e4 336
767e581d 337$(obj)/%.lds: $(src)/%.lds.S FORCE
1da177e4
LT
338 $(call if_changed_dep,cpp_lds_S)
339
4520c6a4
DH
340# ASN.1 grammar
341# ---------------------------------------------------------------------------
342quiet_cmd_asn1_compiler = ASN.1 $@
343 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
344 $(subst .h,.c,$@) $(subst .c,.h,$@)
345
346.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
347
348$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
349 $(call cmd,asn1_compiler)
350
1da177e4
LT
351# Build the compiled-in targets
352# ---------------------------------------------------------------------------
353
354# To build objects in subdirs, we need to descend into the directories
355$(sort $(subdir-obj-y)): $(subdir-ym) ;
356
357#
358# Rule to compile a set of .o files into one .o file
359#
360ifdef builtin-target
361quiet_cmd_link_o_target = LD $@
362# If the list of objects to link is empty, just create an empty built-in.o
363cmd_link_o_target = $(if $(strip $(obj-y)),\
91341d4b
SR
364 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
365 $(cmd_secanalysis),\
40df759e 366 rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
1da177e4
LT
367
368$(builtin-target): $(obj-y) FORCE
369 $(call if_changed,link_o_target)
370
371targets += $(builtin-target)
372endif # builtin-target
373
551559e1
TH
374#
375# Rule to create modules.order file
376#
377# Create commands to either record .ko file or cat modules.order from
378# a subdirectory
379modorder-cmds = \
380 $(foreach m, $(modorder), \
381 $(if $(filter %/modules.order, $m), \
382 cat $m;, echo kernel/$m;))
383
384$(modorder-target): $(subdir-ym) FORCE
385 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
386
1da177e4
LT
387#
388# Rule to compile a set of .o files into one .a file
389#
390ifdef lib-target
391quiet_cmd_link_l_target = AR $@
40df759e 392cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
1da177e4
LT
393
394$(lib-target): $(lib-y) FORCE
395 $(call if_changed,link_l_target)
396
397targets += $(lib-target)
398endif
399
400#
401# Rule to link composite objects
402#
403# Composite objects are specified in kbuild makefile as follows:
404# <composite-object>-objs := <list of .o files>
405# or
406# <composite-object>-y := <list of .o files>
cf4f2193
MM
407# or
408# <composite-object>-m := <list of .o files>
409# The -m syntax only works if <composite object> is a module
1da177e4
LT
410link_multi_deps = \
411$(filter $(addprefix $(obj)/, \
412$($(subst $(obj)/,,$(@:.o=-objs))) \
cf4f2193
MM
413$($(subst $(obj)/,,$(@:.o=-y))) \
414$($(subst $(obj)/,,$(@:.o=-m)))), $^)
38385f8f 415
1da177e4 416quiet_cmd_link_multi-y = LD $@
91341d4b 417cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
1da177e4
LT
418
419quiet_cmd_link_multi-m = LD [M] $@
114f5157 420cmd_link_multi-m = $(cmd_link_multi-y)
1da177e4 421
c8589d1e 422$(multi-used-y): FORCE
1da177e4 423 $(call if_changed,link_multi-y)
c8589d1e 424$(call multi_depend, $(multi-used-y), .o, -objs -y)
1da177e4 425
c8589d1e 426$(multi-used-m): FORCE
1da177e4 427 $(call if_changed,link_multi-m)
9895c03d
NP
428 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
429 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
cf4f2193 430$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
1da177e4
LT
431
432targets += $(multi-used-y) $(multi-used-m)
433
434
435# Descending
436# ---------------------------------------------------------------------------
437
4f193362 438PHONY += $(subdir-ym)
1da177e4
LT
439$(subdir-ym):
440 $(Q)$(MAKE) $(build)=$@
441
442# Add FORCE to the prequisites of a target to force it to be always rebuilt.
443# ---------------------------------------------------------------------------
444
4f193362 445PHONY += FORCE
1da177e4
LT
446
447FORCE:
448
449# Read all saved command lines and dependencies for the $(targets) we
450# may be building above, using $(if_changed{,_dep}). As an
451# optimization, we don't need to read them if the target does not
452# exist, we will rebuild anyway in that case.
453
454targets := $(wildcard $(sort $(targets)))
455cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
456
457ifneq ($(cmd_files),)
458 include $(cmd_files)
459endif
4f193362 460
4f193362
PS
461# Declare the contents of the .PHONY variable as phony. We keep that
462# information in a variable se we can use it in if_changed and friends.
463
464.PHONY: $(PHONY)