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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
53#
Sam Ravnborg28bc20d2011-04-27 22:15:27 +020054# make W=... settings
Borislav Petkov4a5838a2011-03-01 09:35:29 +010055#
Sam Ravnborg28bc20d2011-04-27 22:15:27 +020056# W=1 - warnings that may be relevant and does not occur too often
57# W=2 - warnings that occur quite often but may still be relevant
58# W=3 - the more obscure warnings, can most likely be ignored
59#
60# $(call cc-option, -W...) handles gcc -W.. options which
Borislav Petkov4a5838a2011-03-01 09:35:29 +010061# are not supported by all versions of the compiler
62ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
Michal Mareka6de5532011-04-29 14:45:31 +020063warning- := $(empty)
64
Sam Ravnborg28bc20d2011-04-27 22:15:27 +020065warning-1 := -Wextra -Wunused -Wno-unused-parameter
66warning-1 += -Wmissing-declarations
67warning-1 += -Wmissing-format-attribute
68warning-1 += -Wmissing-prototypes
69warning-1 += -Wold-style-definition
70warning-1 += $(call cc-option, -Wmissing-include-dirs)
Dave Jonesaf0e5d52011-04-21 17:28:13 -040071warning-1 += $(call cc-option, -Wunused-but-set-variable)
Kirill A. Shutemovf858ee82012-01-24 05:10:14 +020072warning-1 += $(call cc-disable-warning, missing-field-initializers)
Sam Ravnborg28bc20d2011-04-27 22:15:27 +020073
74warning-2 := -Waggregate-return
75warning-2 += -Wcast-align
76warning-2 += -Wdisabled-optimization
77warning-2 += -Wnested-externs
78warning-2 += -Wshadow
79warning-2 += $(call cc-option, -Wlogical-op)
Kirill A. Shutemovf858ee82012-01-24 05:10:14 +020080warning-2 += $(call cc-option, -Wmissing-field-initializers)
Sam Ravnborg28bc20d2011-04-27 22:15:27 +020081
82warning-3 := -Wbad-function-cast
83warning-3 += -Wcast-qual
84warning-3 += -Wconversion
85warning-3 += -Wpacked
86warning-3 += -Wpadded
87warning-3 += -Wpointer-arith
88warning-3 += -Wredundant-decls
89warning-3 += -Wswitch-default
90warning-3 += $(call cc-option, -Wpacked-bitfield-compat)
91warning-3 += $(call cc-option, -Wvla)
92
Michal Mareka6de5532011-04-29 14:45:31 +020093warning := $(warning-$(findstring 1, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
94warning += $(warning-$(findstring 2, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
95warning += $(warning-$(findstring 3, $(KBUILD_ENABLE_EXTRA_GCC_CHECKS)))
Sam Ravnborg28bc20d2011-04-27 22:15:27 +020096
Michal Mareka6de5532011-04-29 14:45:31 +020097ifeq ("$(strip $(warning))","")
Sam Ravnborg28bc20d2011-04-27 22:15:27 +020098 $(error W=$(KBUILD_ENABLE_EXTRA_GCC_CHECKS) is unknown)
99endif
100
101KBUILD_CFLAGS += $(warning)
Borislav Petkov4a5838a2011-03-01 09:35:29 +0100102endif
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104include scripts/Makefile.lib
105
106ifdef host-progs
107ifneq ($(hostprogs-y),$(host-progs))
108$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
109hostprogs-y += $(host-progs)
110endif
111endif
112
Robert P. J. Day3156fd02008-02-18 04:48:20 -0500113# Do not include host rules unless needed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114ifneq ($(hostprogs-y)$(hostprogs-m),)
115include scripts/Makefile.host
116endif
117
118ifneq ($(KBUILD_SRC),)
119# Create output directory if not already present
120_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
121
122# Create directories for object files if directory does not exist
123# Needed when obj-y := dir/file.o syntax is used
124_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
125endif
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127ifndef obj
128$(warning kbuild: Makefile.build is included improperly)
129endif
130
131# ===========================================================================
132
133ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
134lib-target := $(obj)/lib.a
135endif
136
Jiafu He4b024242009-12-17 18:22:13 -0700137ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138builtin-target := $(obj)/built-in.o
139endif
140
Tejun Heo551559e2007-12-07 21:04:30 +0900141modorder-target := $(obj)/modules.order
142
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143# We keep a list of all modules in $(MODVERDIR)
144
145__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +0900146 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 $(subdir-ym) $(always)
148 @:
149
150# Linus' kernel sanity checking tool
151ifneq ($(KBUILD_CHECKSRC),0)
152 ifeq ($(KBUILD_CHECKSRC),2)
153 quiet_cmd_force_checksrc = CHECK $<
154 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
155 else
156 quiet_cmd_checksrc = CHECK $<
157 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
158 endif
159endif
160
Sam Ravnborg91341d42008-01-21 21:31:44 +0100161# Do section mismatch analysis for each module/built-in.o
162ifdef CONFIG_DEBUG_SECTION_MISMATCH
163 cmd_secanalysis = ; scripts/mod/modpost $@
164endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166# Compile C sources (.c)
167# ---------------------------------------------------------------------------
168
169# Default is built-in, unless we know otherwise
Sam Ravnborg65881692010-07-28 17:33:09 +0200170modkern_cflags = \
171 $(if $(part-of-module), \
172 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200173 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174quiet_modtag := $(empty) $(empty)
175
Shaohua Li18c167f2009-01-12 10:00:51 +0800176$(real-objs-m) : part-of-module := y
177$(real-objs-m:.o=.i) : part-of-module := y
178$(real-objs-m:.o=.s) : part-of-module := y
179$(real-objs-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181$(real-objs-m) : quiet_modtag := [M]
182$(real-objs-m:.o=.i) : quiet_modtag := [M]
183$(real-objs-m:.o=.s) : quiet_modtag := [M]
184$(real-objs-m:.o=.lst): quiet_modtag := [M]
185
186$(obj-m) : quiet_modtag := [M]
187
188# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200189modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191$(multi-objs-m) : modname = $(modname-multi)
192$(multi-objs-m:.o=.i) : modname = $(modname-multi)
193$(multi-objs-m:.o=.s) : modname = $(modname-multi)
194$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
195$(multi-objs-y) : modname = $(modname-multi)
196$(multi-objs-y:.o=.i) : modname = $(modname-multi)
197$(multi-objs-y:.o=.s) : modname = $(modname-multi)
198$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
199
200quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Chuck Ebbert7d185982006-03-07 23:58:33 -0800201cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Sam Ravnborg767e5812007-05-06 09:23:45 +0200203$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 $(call if_changed_dep,cc_s_c)
205
206quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
207cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
208
Sam Ravnborg767e5812007-05-06 09:23:45 +0200209$(obj)/%.i: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 $(call if_changed_dep,cc_i_c)
211
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100212cmd_gensymtypes = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100213 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
Don Zickuse26d6b82010-05-24 17:07:24 -0400214 $(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100215 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400216 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100217
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200218quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100219cmd_cc_symtypes_c = \
220 set -e; \
Don Zickuse26d6b82010-05-24 17:07:24 -0400221 $(call cmd_gensymtypes,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100222 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200223
Sam Ravnborg767e5812007-05-06 09:23:45 +0200224$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800225 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227# C (.c) files
228# The C file is compiled and updated dependency information is generated.
229# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
230
231quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
232
233ifndef CONFIG_MODVERSIONS
234cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
235
236else
237# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100238# o compile a .tmp_<file>.o from <file>.c
239# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
240# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241# are done.
242# o otherwise, we calculate symbol versions using the good old
243# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100244# that they are usable as a linker script
245# o generate <file>.o from .tmp_<file>.o using the linker to
246# replace the unresolved symbols __crc_exported_symbol with
247# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100249cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Don Zickuse26d6b82010-05-24 17:07:24 -0400250cmd_modversions = \
251 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
252 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
253 > $(@D)/.tmp_$(@F:.o=.ver); \
254 \
255 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
256 -T $(@D)/.tmp_$(@F:.o=.ver); \
257 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
258 else \
259 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 fi;
261endif
262
Steven Rostedt8da38212008-08-14 15:45:07 -0400263ifdef CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedt72441cb2010-10-13 17:12:30 -0400264ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400265ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
266 RECORDMCOUNT_FLAGS = -w
267endif
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400268# Due to recursion, we must skip empty.o.
269# The empty.o file is created in the make process in order to determine
270# the target endianness and word size. It is made before all other C
271# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800272sub_cmd_record_mcount = \
273 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400274 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800275 fi;
Michal Marekd6971822011-05-17 15:36:46 +0200276recordmcount_source := $(srctree)/scripts/recordmcount.c \
277 $(srctree)/scripts/recordmcount.h
Steven Rostedt72441cb2010-10-13 17:12:30 -0400278else
Wu Zhangjin45677452010-10-28 00:24:34 +0800279sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800280 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400281 "$(if $(CONFIG_64BIT),64,32)" \
Rabin Vincentf9810a82010-08-10 19:39:20 +0100282 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
283 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800284 "$(if $(part-of-module),1,0)" "$(@)";
Michal Marekd6971822011-05-17 15:36:46 +0200285recordmcount_source := $(srctree)/scripts/recordmcount.pl
Steven Rostedt8da38212008-08-14 15:45:07 -0400286endif
Wu Zhangjin45677452010-10-28 00:24:34 +0800287cmd_record_mcount = \
288 if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then \
289 $(sub_cmd_record_mcount) \
290 fi;
Steven Rostedt72441cb2010-10-13 17:12:30 -0400291endif
Steven Rostedt8da38212008-08-14 15:45:07 -0400292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100294 $(call echo-cmd,checksrc) $(cmd_checksrc) \
295 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 $(cmd_modversions) \
Andi Kleenc3c63b62009-09-18 12:49:36 -0700297 $(call echo-cmd,record_mcount) \
Steven Rostedt8da38212008-08-14 15:45:07 -0400298 $(cmd_record_mcount) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200299 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
300 $(dot-target).tmp; \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100301 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200302 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303endef
304
305# Built-in and composite module parts
Michal Marekd6971822011-05-17 15:36:46 +0200306$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 $(call cmd,force_checksrc)
308 $(call if_changed_rule,cc_o_c)
309
310# Single-part modules are special since we need to mark them in $(MODVERDIR)
311
Michal Marekd6971822011-05-17 15:36:46 +0200312$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 $(call cmd,force_checksrc)
314 $(call if_changed_rule,cc_o_c)
315 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
316
317quiet_cmd_cc_lst_c = MKLST $@
318 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
319 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
320 System.map $(OBJDUMP) > $@
321
Sam Ravnborg767e5812007-05-06 09:23:45 +0200322$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 $(call if_changed_dep,cc_lst_c)
324
325# Compile assembler sources (.S)
326# ---------------------------------------------------------------------------
327
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200328modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Sam Ravnborg65881692010-07-28 17:33:09 +0200330$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
331$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
333quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
334cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
335
Sam Ravnborg767e5812007-05-06 09:23:45 +0200336$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 $(call if_changed_dep,as_s_S)
338
339quiet_cmd_as_o_S = AS $(quiet_modtag) $@
340cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
341
Sam Ravnborg767e5812007-05-06 09:23:45 +0200342$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 $(call if_changed_dep,as_o_S)
344
345targets += $(real-objs-y) $(real-objs-m) $(lib-y)
346targets += $(extra-y) $(MAKECMDGOALS) $(always)
347
348# Linker scripts preprocessor (.lds.S -> .lds)
349# ---------------------------------------------------------------------------
350quiet_cmd_cpp_lds_S = LDS $@
Sam Ravnborg51b563f2009-09-20 12:28:22 +0200351 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400352 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Sam Ravnborg767e5812007-05-06 09:23:45 +0200354$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 $(call if_changed_dep,cpp_lds_S)
356
357# Build the compiled-in targets
358# ---------------------------------------------------------------------------
359
360# To build objects in subdirs, we need to descend into the directories
361$(sort $(subdir-obj-y)): $(subdir-ym) ;
362
363#
364# Rule to compile a set of .o files into one .o file
365#
366ifdef builtin-target
367quiet_cmd_link_o_target = LD $@
368# If the list of objects to link is empty, just create an empty built-in.o
369cmd_link_o_target = $(if $(strip $(obj-y)),\
Sam Ravnborg91341d42008-01-21 21:31:44 +0100370 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
371 $(cmd_secanalysis),\
Michal Marek40df7592011-04-20 13:45:30 +0200372 rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
374$(builtin-target): $(obj-y) FORCE
375 $(call if_changed,link_o_target)
376
377targets += $(builtin-target)
378endif # builtin-target
379
380#
Tejun Heo551559e2007-12-07 21:04:30 +0900381# Rule to create modules.order file
382#
383# Create commands to either record .ko file or cat modules.order from
384# a subdirectory
385modorder-cmds = \
386 $(foreach m, $(modorder), \
387 $(if $(filter %/modules.order, $m), \
388 cat $m;, echo kernel/$m;))
389
390$(modorder-target): $(subdir-ym) FORCE
391 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
392
393#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394# Rule to compile a set of .o files into one .a file
395#
396ifdef lib-target
397quiet_cmd_link_l_target = AR $@
Michal Marek40df7592011-04-20 13:45:30 +0200398cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
400$(lib-target): $(lib-y) FORCE
401 $(call if_changed,link_l_target)
402
403targets += $(lib-target)
404endif
405
406#
407# Rule to link composite objects
408#
409# Composite objects are specified in kbuild makefile as follows:
410# <composite-object>-objs := <list of .o files>
411# or
412# <composite-object>-y := <list of .o files>
413link_multi_deps = \
414$(filter $(addprefix $(obj)/, \
415$($(subst $(obj)/,,$(@:.o=-objs))) \
416$($(subst $(obj)/,,$(@:.o=-y)))), $^)
417
418quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100419cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
421quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700422cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424# We would rather have a list of rules like
425# foo.o: $(foo-objs)
426# but that's not so easy, so we rather make all composite objects depend
427# on the set of all their parts
428$(multi-used-y) : %.o: $(multi-objs-y) FORCE
429 $(call if_changed,link_multi-y)
430
431$(multi-used-m) : %.o: $(multi-objs-m) FORCE
432 $(call if_changed,link_multi-m)
433 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
434
435targets += $(multi-used-y) $(multi-used-m)
436
437
438# Descending
439# ---------------------------------------------------------------------------
440
Paul Smith4f193362006-03-05 17:14:10 -0500441PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442$(subdir-ym):
443 $(Q)$(MAKE) $(build)=$@
444
445# Add FORCE to the prequisites of a target to force it to be always rebuilt.
446# ---------------------------------------------------------------------------
447
Paul Smith4f193362006-03-05 17:14:10 -0500448PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450FORCE:
451
452# Read all saved command lines and dependencies for the $(targets) we
453# may be building above, using $(if_changed{,_dep}). As an
454# optimization, we don't need to read them if the target does not
455# exist, we will rebuild anyway in that case.
456
457targets := $(wildcard $(sort $(targets)))
458cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
459
460ifneq ($(cmd_files),)
461 include $(cmd_files)
462endif
Paul Smith4f193362006-03-05 17:14:10 -0500463
Paul Smith4f193362006-03-05 17:14:10 -0500464# Declare the contents of the .PHONY variable as phony. We keep that
465# information in a variable se we can use it in if_changed and friends.
466
467.PHONY: $(PHONY)