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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
Robert P. J. Day3156fd02008-02-18 04:48:20 -050030# Read auto.conf if it exists, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070031-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Sam Ravnborg20a468b2006-01-22 13:34:15 +010033include scripts/Kbuild.include
34
Robert P. J. Day3156fd02008-02-18 04:48:20 -050035# For backward compatibility check that these variables do not change
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020036save-cflags := $(CFLAGS)
37
Sam Ravnborg2a691472005-07-25 20:26:04 +000038# The filename Kbuild has precedence over Makefile
Sam Ravnborgdb8c1a72005-07-27 22:11:01 +020039kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020040kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
41include $(kbuild-file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020043# If the save-* variables changed error out
44ifeq ($(KBUILD_NOPEDANTIC),)
45 ifneq ("$(save-cflags)","$(CFLAGS)")
46 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
47 endif
48endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070049include scripts/Makefile.lib
50
51ifdef host-progs
52ifneq ($(hostprogs-y),$(host-progs))
53$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
54hostprogs-y += $(host-progs)
55endif
56endif
57
Robert P. J. Day3156fd02008-02-18 04:48:20 -050058# Do not include host rules unless needed
Linus Torvalds1da177e2005-04-16 15:20:36 -070059ifneq ($(hostprogs-y)$(hostprogs-m),)
60include scripts/Makefile.host
61endif
62
63ifneq ($(KBUILD_SRC),)
64# Create output directory if not already present
65_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
66
67# Create directories for object files if directory does not exist
68# Needed when obj-y := dir/file.o syntax is used
69_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
70endif
71
Linus Torvalds1da177e2005-04-16 15:20:36 -070072ifndef obj
73$(warning kbuild: Makefile.build is included improperly)
74endif
75
76# ===========================================================================
77
78ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
79lib-target := $(obj)/lib.a
80endif
81
82ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
83builtin-target := $(obj)/built-in.o
84endif
85
Tejun Heo551559e2007-12-07 21:04:30 +090086modorder-target := $(obj)/modules.order
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088# We keep a list of all modules in $(MODVERDIR)
89
90__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +090091 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 $(subdir-ym) $(always)
93 @:
94
95# Linus' kernel sanity checking tool
96ifneq ($(KBUILD_CHECKSRC),0)
97 ifeq ($(KBUILD_CHECKSRC),2)
98 quiet_cmd_force_checksrc = CHECK $<
99 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
100 else
101 quiet_cmd_checksrc = CHECK $<
102 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
103 endif
104endif
105
Sam Ravnborg91341d42008-01-21 21:31:44 +0100106# Do section mismatch analysis for each module/built-in.o
107ifdef CONFIG_DEBUG_SECTION_MISMATCH
108 cmd_secanalysis = ; scripts/mod/modpost $@
109endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110
111# Compile C sources (.c)
112# ---------------------------------------------------------------------------
113
114# Default is built-in, unless we know otherwise
115modkern_cflags := $(CFLAGS_KERNEL)
116quiet_modtag := $(empty) $(empty)
117
118$(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
119$(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
120$(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
121$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
122
123$(real-objs-m) : quiet_modtag := [M]
124$(real-objs-m:.o=.i) : quiet_modtag := [M]
125$(real-objs-m:.o=.s) : quiet_modtag := [M]
126$(real-objs-m:.o=.lst): quiet_modtag := [M]
127
128$(obj-m) : quiet_modtag := [M]
129
130# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200131modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132
133$(multi-objs-m) : modname = $(modname-multi)
134$(multi-objs-m:.o=.i) : modname = $(modname-multi)
135$(multi-objs-m:.o=.s) : modname = $(modname-multi)
136$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
137$(multi-objs-y) : modname = $(modname-multi)
138$(multi-objs-y:.o=.i) : modname = $(modname-multi)
139$(multi-objs-y:.o=.s) : modname = $(modname-multi)
140$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
141
142quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Chuck Ebbert7d185982006-03-07 23:58:33 -0800143cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
Sam Ravnborg767e5812007-05-06 09:23:45 +0200145$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 $(call if_changed_dep,cc_s_c)
147
148quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
149cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
150
Sam Ravnborg767e5812007-05-06 09:23:45 +0200151$(obj)/%.i: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 $(call if_changed_dep,cc_i_c)
153
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200154quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
155cmd_cc_symtypes_c = \
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800156 set -e; \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200157 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800158 | $(GENKSYMS) -T $@ \
159 -r $(firstword $(wildcard \
160 $(@:.symtypes=.symref) /dev/null)) \
161 $(if $(KBUILD_PRESERVE),-p) \
162 -a $(ARCH) \
163 >/dev/null; \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200164 test -s $@ || rm -f $@
165
Sam Ravnborg767e5812007-05-06 09:23:45 +0200166$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800167 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169# C (.c) files
170# The C file is compiled and updated dependency information is generated.
171# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
172
173quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
174
175ifndef CONFIG_MODVERSIONS
176cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
177
178else
179# When module versioning is enabled the following steps are executed:
180# o compile a .tmp_<file>.o from <file>.c
181# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
182# not export symbols, we just rename .tmp_<file>.o to <file>.o and
183# are done.
184# o otherwise, we calculate symbol versions using the good old
185# genksyms on the preprocessed source and postprocess them in a way
186# that they are usable as a linker script
187# o generate <file>.o from .tmp_<file>.o using the linker to
188# replace the unresolved symbols __crc_exported_symbol with
189# the actual value of the checksum generated by genksyms
190
191cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
192cmd_modversions = \
193 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
194 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200195 | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800196 -T $(@:.o=.symtypes)) \
197 -r $(firstword $(wildcard \
198 $(@:.o=.symref) /dev/null)) \
199 $(if $(KBUILD_PRESERVE),-p) \
200 -a $(ARCH) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 > $(@D)/.tmp_$(@F:.o=.ver); \
202 \
203 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
204 -T $(@D)/.tmp_$(@F:.o=.ver); \
205 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
206 else \
Sam Ravnborgcfca82f2005-07-14 20:12:40 +0000207 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 fi;
209endif
210
Steven Rostedtdce9d182008-10-23 09:32:57 -0400211ifdef CONFIG_64BIT
212arch_bits = 64
213else
214arch_bits = 32
215endif
216
Steven Rostedt8da38212008-08-14 15:45:07 -0400217ifdef CONFIG_FTRACE_MCOUNT_RECORD
Andrew Mortonb3a32042008-08-27 09:08:30 +0200218cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl \
Steven Rostedtdce9d182008-10-23 09:32:57 -0400219 "$(ARCH)" "$(arch_bits)" "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" \
220 "$(NM)" "$(RM)" "$(MV)" "$(@)";
Steven Rostedt8da38212008-08-14 15:45:07 -0400221endif
222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100224 $(call echo-cmd,checksrc) $(cmd_checksrc) \
225 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 $(cmd_modversions) \
Steven Rostedt8da38212008-08-14 15:45:07 -0400227 $(cmd_record_mcount) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200228 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
229 $(dot-target).tmp; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200231 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232endef
233
234# Built-in and composite module parts
Sam Ravnborg767e5812007-05-06 09:23:45 +0200235$(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 $(call cmd,force_checksrc)
237 $(call if_changed_rule,cc_o_c)
238
239# Single-part modules are special since we need to mark them in $(MODVERDIR)
240
Sam Ravnborg767e5812007-05-06 09:23:45 +0200241$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 $(call cmd,force_checksrc)
243 $(call if_changed_rule,cc_o_c)
244 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
245
246quiet_cmd_cc_lst_c = MKLST $@
247 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
248 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
249 System.map $(OBJDUMP) > $@
250
Sam Ravnborg767e5812007-05-06 09:23:45 +0200251$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 $(call if_changed_dep,cc_lst_c)
253
254# Compile assembler sources (.S)
255# ---------------------------------------------------------------------------
256
257modkern_aflags := $(AFLAGS_KERNEL)
258
259$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
260$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
261
262quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
263cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
264
Sam Ravnborg767e5812007-05-06 09:23:45 +0200265$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 $(call if_changed_dep,as_s_S)
267
268quiet_cmd_as_o_S = AS $(quiet_modtag) $@
269cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
270
Sam Ravnborg767e5812007-05-06 09:23:45 +0200271$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 $(call if_changed_dep,as_o_S)
273
274targets += $(real-objs-y) $(real-objs-m) $(lib-y)
275targets += $(extra-y) $(MAKECMDGOALS) $(always)
276
277# Linker scripts preprocessor (.lds.S -> .lds)
278# ---------------------------------------------------------------------------
279quiet_cmd_cpp_lds_S = LDS $@
280 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
281
Sam Ravnborg767e5812007-05-06 09:23:45 +0200282$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 $(call if_changed_dep,cpp_lds_S)
284
285# Build the compiled-in targets
286# ---------------------------------------------------------------------------
287
288# To build objects in subdirs, we need to descend into the directories
289$(sort $(subdir-obj-y)): $(subdir-ym) ;
290
291#
292# Rule to compile a set of .o files into one .o file
293#
294ifdef builtin-target
295quiet_cmd_link_o_target = LD $@
296# If the list of objects to link is empty, just create an empty built-in.o
297cmd_link_o_target = $(if $(strip $(obj-y)),\
Sam Ravnborg91341d42008-01-21 21:31:44 +0100298 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
299 $(cmd_secanalysis),\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 rm -f $@; $(AR) rcs $@)
301
302$(builtin-target): $(obj-y) FORCE
303 $(call if_changed,link_o_target)
304
305targets += $(builtin-target)
306endif # builtin-target
307
308#
Tejun Heo551559e2007-12-07 21:04:30 +0900309# Rule to create modules.order file
310#
311# Create commands to either record .ko file or cat modules.order from
312# a subdirectory
313modorder-cmds = \
314 $(foreach m, $(modorder), \
315 $(if $(filter %/modules.order, $m), \
316 cat $m;, echo kernel/$m;))
317
318$(modorder-target): $(subdir-ym) FORCE
319 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
320
321#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322# Rule to compile a set of .o files into one .a file
323#
324ifdef lib-target
325quiet_cmd_link_l_target = AR $@
Sam Ravnborg5e54d5e2007-09-30 20:14:58 +0200326cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328$(lib-target): $(lib-y) FORCE
329 $(call if_changed,link_l_target)
330
331targets += $(lib-target)
332endif
333
334#
335# Rule to link composite objects
336#
337# Composite objects are specified in kbuild makefile as follows:
338# <composite-object>-objs := <list of .o files>
339# or
340# <composite-object>-y := <list of .o files>
341link_multi_deps = \
342$(filter $(addprefix $(obj)/, \
343$($(subst $(obj)/,,$(@:.o=-objs))) \
344$($(subst $(obj)/,,$(@:.o=-y)))), $^)
345
346quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100347cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
349quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700350cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352# We would rather have a list of rules like
353# foo.o: $(foo-objs)
354# but that's not so easy, so we rather make all composite objects depend
355# on the set of all their parts
356$(multi-used-y) : %.o: $(multi-objs-y) FORCE
357 $(call if_changed,link_multi-y)
358
359$(multi-used-m) : %.o: $(multi-objs-m) FORCE
360 $(call if_changed,link_multi-m)
361 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
362
363targets += $(multi-used-y) $(multi-used-m)
364
365
366# Descending
367# ---------------------------------------------------------------------------
368
Paul Smith4f193362006-03-05 17:14:10 -0500369PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370$(subdir-ym):
371 $(Q)$(MAKE) $(build)=$@
372
373# Add FORCE to the prequisites of a target to force it to be always rebuilt.
374# ---------------------------------------------------------------------------
375
Paul Smith4f193362006-03-05 17:14:10 -0500376PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378FORCE:
379
380# Read all saved command lines and dependencies for the $(targets) we
381# may be building above, using $(if_changed{,_dep}). As an
382# optimization, we don't need to read them if the target does not
383# exist, we will rebuild anyway in that case.
384
385targets := $(wildcard $(sort $(targets)))
386cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
387
388ifneq ($(cmd_files),)
389 include $(cmd_files)
390endif
Paul Smith4f193362006-03-05 17:14:10 -0500391
392
393# Declare the contents of the .PHONY variable as phony. We keep that
394# information in a variable se we can use it in if_changed and friends.
395
396.PHONY: $(PHONY)