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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 += $(host-progs)
59endif
60endif
61
Robert P. J. Day3156fd02008-02-18 04:48:20 -050062# Do not include host rules unless needed
Emese Revfy24403872016-05-24 00:08:25 +020063ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064include scripts/Makefile.host
65endif
66
67ifneq ($(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
Al Viro7f2084f2016-01-15 14:01:22 -050084obj-y += $(obj)/lib-ksyms.o
Linus Torvalds1da177e2005-04-16 15:20:36 -070085endif
86
Masahiro Yamadaa4954fd2014-09-09 19:26:21 +090087ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -070088builtin-target := $(obj)/built-in.o
89endif
90
Tejun Heo551559e2007-12-07 21:04:30 +090091modorder-target := $(obj)/modules.order
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093# We keep a list of all modules in $(MODVERDIR)
94
95__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +090096 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 $(subdir-ym) $(always)
98 @:
99
100# Linus' kernel sanity checking tool
101ifneq ($(KBUILD_CHECKSRC),0)
102 ifeq ($(KBUILD_CHECKSRC),2)
103 quiet_cmd_force_checksrc = CHECK $<
104 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
105 else
106 quiet_cmd_checksrc = CHECK $<
107 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
108 endif
109endif
110
Sam Ravnborg91341d42008-01-21 21:31:44 +0100111# Do section mismatch analysis for each module/built-in.o
112ifdef CONFIG_DEBUG_SECTION_MISMATCH
113 cmd_secanalysis = ; scripts/mod/modpost $@
114endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116# Compile C sources (.c)
117# ---------------------------------------------------------------------------
118
119# Default is built-in, unless we know otherwise
Sam Ravnborg65881692010-07-28 17:33:09 +0200120modkern_cflags = \
121 $(if $(part-of-module), \
122 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200123 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124quiet_modtag := $(empty) $(empty)
125
Shaohua Li18c167f2009-01-12 10:00:51 +0800126$(real-objs-m) : part-of-module := y
127$(real-objs-m:.o=.i) : part-of-module := y
128$(real-objs-m:.o=.s) : part-of-module := y
129$(real-objs-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131$(real-objs-m) : quiet_modtag := [M]
132$(real-objs-m:.o=.i) : quiet_modtag := [M]
133$(real-objs-m:.o=.s) : quiet_modtag := [M]
134$(real-objs-m:.o=.lst): quiet_modtag := [M]
135
136$(obj-m) : quiet_modtag := [M]
137
138# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200139modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141$(multi-objs-m) : modname = $(modname-multi)
142$(multi-objs-m:.o=.i) : modname = $(modname-multi)
143$(multi-objs-m:.o=.s) : modname = $(modname-multi)
144$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
145$(multi-objs-y) : modname = $(modname-multi)
146$(multi-objs-y:.o=.i) : modname = $(modname-multi)
147$(multi-objs-y:.o=.s) : modname = $(modname-multi)
148$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
149
150quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Andi Kleen1e64ff42014-02-08 09:01:15 +0100151cmd_cc_s_c = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Sam Ravnborg767e5812007-05-06 09:23:45 +0200153$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 $(call if_changed_dep,cc_s_c)
155
Masahiro Yamada23d43842016-04-08 11:24:47 +0900156quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
157cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Sam Ravnborg767e5812007-05-06 09:23:45 +0200159$(obj)/%.i: $(src)/%.c FORCE
Masahiro Yamada23d43842016-04-08 11:24:47 +0900160 $(call if_changed_dep,cpp_i_c)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100162# These mirror gensymtypes_S and co below, keep them in synch.
163cmd_gensymtypes_c = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100164 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
James Hogand70f82a2013-03-18 19:38:56 +1030165 $(GENKSYMS) $(if $(1), -T $(2)) \
166 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100167 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400168 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100169
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200170quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100171cmd_cc_symtypes_c = \
172 set -e; \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100173 $(call cmd_gensymtypes_c,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100174 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200175
Sam Ravnborg767e5812007-05-06 09:23:45 +0200176$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800177 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179# C (.c) files
180# The C file is compiled and updated dependency information is generated.
181# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
182
183quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
184
185ifndef CONFIG_MODVERSIONS
186cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
187
188else
189# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100190# o compile a .tmp_<file>.o from <file>.c
191# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
192# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193# are done.
194# o otherwise, we calculate symbol versions using the good old
195# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100196# that they are usable as a linker script
197# o generate <file>.o from .tmp_<file>.o using the linker to
198# replace the unresolved symbols __crc_exported_symbol with
199# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100201cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100202
203cmd_modversions_c = \
Don Zickuse26d6b82010-05-24 17:07:24 -0400204 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100205 $(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400206 > $(@D)/.tmp_$(@F:.o=.ver); \
207 \
208 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
209 -T $(@D)/.tmp_$(@F:.o=.ver); \
210 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
211 else \
212 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 fi;
214endif
215
Steven Rostedt8da38212008-08-14 15:45:07 -0400216ifdef CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedt72441cb2010-10-13 17:12:30 -0400217ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400218ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
219 RECORDMCOUNT_FLAGS = -w
220endif
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400221# Due to recursion, we must skip empty.o.
222# The empty.o file is created in the make process in order to determine
223# the target endianness and word size. It is made before all other C
224# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800225sub_cmd_record_mcount = \
226 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400227 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800228 fi;
Michal Marekd6971822011-05-17 15:36:46 +0200229recordmcount_source := $(srctree)/scripts/recordmcount.c \
230 $(srctree)/scripts/recordmcount.h
Steven Rostedt72441cb2010-10-13 17:12:30 -0400231else
Wu Zhangjin45677452010-10-28 00:24:34 +0800232sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800233 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400234 "$(if $(CONFIG_64BIT),64,32)" \
Rabin Vincentf9810a82010-08-10 19:39:20 +0100235 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
236 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800237 "$(if $(part-of-module),1,0)" "$(@)";
Michal Marekd6971822011-05-17 15:36:46 +0200238recordmcount_source := $(srctree)/scripts/recordmcount.pl
Steven Rostedt8da38212008-08-14 15:45:07 -0400239endif
Heiko Carstensc0a80c02015-01-09 13:06:33 +0100240cmd_record_mcount = \
241 if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" = \
242 "$(CC_FLAGS_FTRACE)" ]; then \
Wu Zhangjin45677452010-10-28 00:24:34 +0800243 $(sub_cmd_record_mcount) \
244 fi;
Steven Rostedt72441cb2010-10-13 17:12:30 -0400245endif
Steven Rostedt8da38212008-08-14 15:45:07 -0400246
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600247ifdef CONFIG_STACK_VALIDATION
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600248ifneq ($(SKIP_STACK_VALIDATION),1)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600249
250__objtool_obj := $(objtree)/tools/objtool/objtool
251
252objtool_args = check
253ifndef CONFIG_FRAME_POINTER
254objtool_args += --no-fp
255endif
256
257# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
258# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
259# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
260cmd_objtool = $(if $(patsubst y%,, \
261 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
262 $(__objtool_obj) $(objtool_args) "$(@)";)
263objtool_obj = $(if $(patsubst y%,, \
264 $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \
265 $(__objtool_obj))
266
Josh Poimboeuf3b27a0c2016-03-03 11:39:30 -0600267endif # SKIP_STACK_VALIDATION
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600268endif # CONFIG_STACK_VALIDATION
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100271 $(call echo-cmd,checksrc) $(cmd_checksrc) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500272 $(call cmd_and_fixdep,cc_o_c) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100273 $(cmd_modversions_c) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500274 $(cmd_objtool) \
275 $(call echo-cmd,record_mcount) $(cmd_record_mcount)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276endef
277
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600278define rule_as_o_S
Nicolas Pitree4aca452016-02-17 15:50:06 -0500279 $(call cmd_and_fixdep,as_o_S) \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100280 $(cmd_modversions_S) \
Nicolas Pitree4aca452016-02-17 15:50:06 -0500281 $(cmd_objtool)
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600282endef
283
Nicolas Pitre9895c032016-01-21 17:07:24 -0500284# List module undefined symbols (or empty line if not enabled)
285ifdef CONFIG_TRIM_UNUSED_KSYMS
286cmd_undef_syms = $(NM) $@ | sed -n 's/^ \+U //p' | xargs echo
287else
288cmd_undef_syms = echo
289endif
290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291# Built-in and composite module parts
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600292$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 $(call cmd,force_checksrc)
294 $(call if_changed_rule,cc_o_c)
295
296# Single-part modules are special since we need to mark them in $(MODVERDIR)
297
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600298$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_obj) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 $(call cmd,force_checksrc)
300 $(call if_changed_rule,cc_o_c)
Nicolas Pitre9895c032016-01-21 17:07:24 -0500301 @{ echo $(@:.o=.ko); echo $@; \
302 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304quiet_cmd_cc_lst_c = MKLST $@
305 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
306 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
307 System.map $(OBJDUMP) > $@
308
Sam Ravnborg767e5812007-05-06 09:23:45 +0200309$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 $(call if_changed_dep,cc_lst_c)
311
312# Compile assembler sources (.S)
313# ---------------------------------------------------------------------------
314
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200315modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Sam Ravnborg65881692010-07-28 17:33:09 +0200317$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
318$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100320# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
321# or a file that it includes, in order to get versioned symbols. We build a
322# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
323# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
324#
325# This is convoluted. The .S file must first be preprocessed to run guards and
326# expand names, then the resulting exports must be constructed into plain
327# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
328# to make the genksyms input.
329#
330# These mirror gensymtypes_c and co above, keep them in synch.
331cmd_gensymtypes_S = \
332 (echo "\#include <linux/kernel.h>" ; \
333 echo "\#include <asm/asm-prototypes.h>" ; \
334 $(CPP) $(a_flags) $< | \
Nicholas Piggincc6acc12016-11-09 15:34:05 +1100335 grep "\<___EXPORT_SYMBOL\>" | \
336 sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100337 $(CPP) -D__GENKSYMS__ $(c_flags) -xc - | \
338 $(GENKSYMS) $(if $(1), -T $(2)) \
339 $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX)) \
340 $(if $(KBUILD_PRESERVE),-p) \
341 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
342
343quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
344cmd_cc_symtypes_S = \
345 set -e; \
346 $(call cmd_gensymtypes_S,true,$@) >/dev/null; \
347 test -s $@ || rm -f $@
348
349$(obj)/%.symtypes : $(src)/%.S FORCE
350 $(call cmd,cc_symtypes_S)
351
352
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900353quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
354cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
Sam Ravnborg767e5812007-05-06 09:23:45 +0200356$(obj)/%.s: $(src)/%.S FORCE
Masahiro Yamadae0f41e52016-04-08 11:24:48 +0900357 $(call if_changed_dep,cpp_s_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
359quiet_cmd_as_o_S = AS $(quiet_modtag) $@
Nicholas Piggin4efca4e2016-11-01 12:46:19 +1100360
361ifndef CONFIG_MODVERSIONS
362cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
363
364else
365
366ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h)
367
368ifeq ($(ASM_PROTOTYPES),)
369cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
370
371else
372
373# versioning matches the C process described above, with difference that
374# we parse asm-prototypes.h C header to get function definitions.
375
376cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $<
377
378cmd_modversions_S = \
379 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
380 $(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
381 > $(@D)/.tmp_$(@F:.o=.ver); \
382 \
383 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
384 -T $(@D)/.tmp_$(@F:.o=.ver); \
385 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
386 else \
387 mv -f $(@D)/.tmp_$(@F) $@; \
388 fi;
389endif
390endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391
Josh Poimboeufb9ab5eb2016-02-28 22:22:42 -0600392$(obj)/%.o: $(src)/%.S $(objtool_obj) FORCE
393 $(call if_changed_rule,as_o_S)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395targets += $(real-objs-y) $(real-objs-m) $(lib-y)
396targets += $(extra-y) $(MAKECMDGOALS) $(always)
397
398# Linker scripts preprocessor (.lds.S -> .lds)
399# ---------------------------------------------------------------------------
400quiet_cmd_cpp_lds_S = LDS $@
Sam Ravnborg51b563f2009-09-20 12:28:22 +0200401 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400402 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
Sam Ravnborg767e5812007-05-06 09:23:45 +0200404$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 $(call if_changed_dep,cpp_lds_S)
406
David Howells4520c6a2012-09-21 23:31:13 +0100407# ASN.1 grammar
408# ---------------------------------------------------------------------------
409quiet_cmd_asn1_compiler = ASN.1 $@
410 cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
411 $(subst .h,.c,$@) $(subst .c,.h,$@)
412
413.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h
414
415$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
416 $(call cmd,asn1_compiler)
417
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418# Build the compiled-in targets
419# ---------------------------------------------------------------------------
420
421# To build objects in subdirs, we need to descend into the directories
422$(sort $(subdir-obj-y)): $(subdir-ym) ;
423
424#
425# Rule to compile a set of .o files into one .o file
426#
427ifdef builtin-target
Stephen Rothwella5967db2016-08-24 22:29:19 +1000428
429ifdef CONFIG_THIN_ARCHIVES
430 cmd_make_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
431 cmd_make_empty_builtin = rm -f $@; $(AR) rcST$(KBUILD_ARFLAGS)
432 quiet_cmd_link_o_target = AR $@
433else
434 cmd_make_builtin = $(LD) $(ld_flags) -r -o
435 cmd_make_empty_builtin = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS)
436 quiet_cmd_link_o_target = LD $@
437endif
438
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439# If the list of objects to link is empty, just create an empty built-in.o
440cmd_link_o_target = $(if $(strip $(obj-y)),\
Stephen Rothwella5967db2016-08-24 22:29:19 +1000441 $(cmd_make_builtin) $@ $(filter $(obj-y), $^) \
Sam Ravnborg91341d42008-01-21 21:31:44 +0100442 $(cmd_secanalysis),\
Stephen Rothwella5967db2016-08-24 22:29:19 +1000443 $(cmd_make_empty_builtin) $@)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
445$(builtin-target): $(obj-y) FORCE
446 $(call if_changed,link_o_target)
447
448targets += $(builtin-target)
449endif # builtin-target
450
451#
Tejun Heo551559e2007-12-07 21:04:30 +0900452# Rule to create modules.order file
453#
454# Create commands to either record .ko file or cat modules.order from
455# a subdirectory
456modorder-cmds = \
457 $(foreach m, $(modorder), \
458 $(if $(filter %/modules.order, $m), \
459 cat $m;, echo kernel/$m;))
460
461$(modorder-target): $(subdir-ym) FORCE
462 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
463
464#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465# Rule to compile a set of .o files into one .a file
466#
467ifdef lib-target
468quiet_cmd_link_l_target = AR $@
Stephen Rothwella5967db2016-08-24 22:29:19 +1000469
470ifdef CONFIG_THIN_ARCHIVES
471 cmd_link_l_target = rm -f $@; $(AR) rcsT$(KBUILD_ARFLAGS) $@ $(lib-y)
472else
473 cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
474endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475
476$(lib-target): $(lib-y) FORCE
477 $(call if_changed,link_l_target)
478
479targets += $(lib-target)
Al Viro7f2084f2016-01-15 14:01:22 -0500480
481dummy-object = $(obj)/.lib_exports.o
482ksyms-lds = $(dot-target).lds
483ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
484ref_prefix = EXTERN(_
485else
486ref_prefix = EXTERN(
487endif
488
489quiet_cmd_export_list = EXPORTS $@
490cmd_export_list = $(OBJDUMP) -h $< | \
491 sed -ne '/___ksymtab/{s/.*+/$(ref_prefix)/;s/ .*/)/;p}' >$(ksyms-lds);\
492 rm -f $(dummy-object);\
493 $(AR) rcs$(KBUILD_ARFLAGS) $(dummy-object);\
494 $(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\
495 rm $(dummy-object) $(ksyms-lds)
496
497$(obj)/lib-ksyms.o: $(lib-target) FORCE
498 $(call if_changed,export_list)
Nicholas Piggin989cea5c2016-10-21 01:13:33 +1100499
500targets += $(obj)/lib-ksyms.o
501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502endif
503
504#
505# Rule to link composite objects
506#
507# Composite objects are specified in kbuild makefile as follows:
508# <composite-object>-objs := <list of .o files>
509# or
510# <composite-object>-y := <list of .o files>
Michal Marekcf4f2192015-10-27 14:02:24 +0100511# or
512# <composite-object>-m := <list of .o files>
513# The -m syntax only works if <composite object> is a module
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514link_multi_deps = \
515$(filter $(addprefix $(obj)/, \
516$($(subst $(obj)/,,$(@:.o=-objs))) \
Michal Marekcf4f2192015-10-27 14:02:24 +0100517$($(subst $(obj)/,,$(@:.o=-y))) \
518$($(subst $(obj)/,,$(@:.o=-m)))), $^)
Masahiro Yamada38385f82014-04-28 16:26:18 +0900519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100521cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700524cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900526$(multi-used-y): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 $(call if_changed,link_multi-y)
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900528$(call multi_depend, $(multi-used-y), .o, -objs -y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Masahiro Yamadac8589d12014-08-19 16:34:20 +0900530$(multi-used-m): FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 $(call if_changed,link_multi-m)
Nicolas Pitre9895c032016-01-21 17:07:24 -0500532 @{ echo $(@:.o=.ko); echo $(link_multi_deps); \
533 $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod)
Michal Marekcf4f2192015-10-27 14:02:24 +0100534$(call multi_depend, $(multi-used-m), .o, -objs -y -m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
536targets += $(multi-used-y) $(multi-used-m)
537
538
539# Descending
540# ---------------------------------------------------------------------------
541
Paul Smith4f193362006-03-05 17:14:10 -0500542PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543$(subdir-ym):
544 $(Q)$(MAKE) $(build)=$@
545
546# Add FORCE to the prequisites of a target to force it to be always rebuilt.
547# ---------------------------------------------------------------------------
548
Paul Smith4f193362006-03-05 17:14:10 -0500549PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
551FORCE:
552
553# Read all saved command lines and dependencies for the $(targets) we
554# may be building above, using $(if_changed{,_dep}). As an
555# optimization, we don't need to read them if the target does not
556# exist, we will rebuild anyway in that case.
557
558targets := $(wildcard $(sort $(targets)))
559cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
560
561ifneq ($(cmd_files),)
562 include $(cmd_files)
563endif
Paul Smith4f193362006-03-05 17:14:10 -0500564
Paul Smith4f193362006-03-05 17:14:10 -0500565# Declare the contents of the .PHONY variable as phony. We keep that
566# information in a variable se we can use it in if_changed and friends.
567
568.PHONY: $(PHONY)