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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
Jan Beulichad7a9532008-12-16 11:28:14 +0000154cmd_genksyms = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100155 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
Jan Beulichad7a9532008-12-16 11:28:14 +0000156 $(GENKSYMS) -T $@ -A -a $(ARCH) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100157 $(if $(KBUILD_PRESERVE),-p) \
158 $(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null)))
159
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200160quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100161cmd_cc_symtypes_c = \
162 set -e; \
Jan Beulichad7a9532008-12-16 11:28:14 +0000163 $(call cmd_genksyms, true) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100164 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200165
Sam Ravnborg767e5812007-05-06 09:23:45 +0200166$(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:
Jan Beulichad7a9532008-12-16 11:28:14 +0000180# o compile a .tmp_<file>.s from <file>.c
181# o if .tmp_<file>.s doesn't contain a __ksymtab version, i.e. does
182# not export symbols, we just assemble .tmp_<file>.s to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183# 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
Jan Beulichad7a9532008-12-16 11:28:14 +0000186# that they are usable as assembly source
187# o assemble <file>.o from .tmp_<file>.s forcing inclusion of directives
188# defining the actual values of __crc_*, followed by objcopy-ing them
189# to force these symbols to be local to permit stripping them later.
190s_file = $(@D)/.tmp_$(@F:.o=.s)
191v_file = $(@D)/.tmp_$(@F:.o=.v)
192tmp_o_file = $(@D)/.tmp_$(@F)
193no_g_c_flags = $(filter-out -g%,$(c_flags))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Jan Beulichad7a9532008-12-16 11:28:14 +0000195cmd_cc_o_c = $(CC) $(c_flags) -S -o $(s_file) $<
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197cmd_modversions = \
Jan Beulichad7a9532008-12-16 11:28:14 +0000198 if grep -q __ksymtab $(s_file); then \
199 if $(call cmd_genksyms, $(KBUILD_SYMTYPES)) > $(v_file) \
200 && $(CC) $(no_g_c_flags) -c -Wa,$(v_file) \
201 -o $(tmp_o_file) $(s_file) \
202 && $(OBJCOPY) -L '__crc_*' -L '___crc_*' -w \
203 $(tmp_o_file) $@; \
204 then \
205 : ; \
206 else \
207 rm -f $@; exit 1; \
208 fi; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 else \
Jan Beulichad7a9532008-12-16 11:28:14 +0000210 rm -f $(v_file); \
211 $(CC) $(no_g_c_flags) -c -o $@ $(s_file); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 fi;
213endif
214
Steven Rostedt8da38212008-08-14 15:45:07 -0400215ifdef CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedtb3acf292008-10-29 15:30:26 -0400216cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
217 "$(if $(CONFIG_64BIT),64,32)" \
218 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" "$(@)";
Steven Rostedt8da38212008-08-14 15:45:07 -0400219endif
220
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100222 $(call echo-cmd,checksrc) $(cmd_checksrc) \
223 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 $(cmd_modversions) \
Steven Rostedt8da38212008-08-14 15:45:07 -0400225 $(cmd_record_mcount) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200226 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
227 $(dot-target).tmp; \
Jan Beulichad7a9532008-12-16 11:28:14 +0000228 if [ -r $(@D)/.tmp_$(@F:.o=.v) ]; then \
229 echo >> $(dot-target).tmp; \
230 echo '$@: $(GENKSYMS)' >> $(dot-target).tmp; \
231 echo '$(GENKSYMS):: ;' >> $(dot-target).tmp; \
232 fi; \
233 rm -f $(depfile) $(@D)/.tmp_$(@F:.o=.?); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200234 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235endef
236
237# Built-in and composite module parts
Sam Ravnborg767e5812007-05-06 09:23:45 +0200238$(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 $(call cmd,force_checksrc)
240 $(call if_changed_rule,cc_o_c)
241
242# Single-part modules are special since we need to mark them in $(MODVERDIR)
243
Sam Ravnborg767e5812007-05-06 09:23:45 +0200244$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 $(call cmd,force_checksrc)
246 $(call if_changed_rule,cc_o_c)
247 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
248
249quiet_cmd_cc_lst_c = MKLST $@
250 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
251 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
252 System.map $(OBJDUMP) > $@
253
Sam Ravnborg767e5812007-05-06 09:23:45 +0200254$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 $(call if_changed_dep,cc_lst_c)
256
257# Compile assembler sources (.S)
258# ---------------------------------------------------------------------------
259
260modkern_aflags := $(AFLAGS_KERNEL)
261
262$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
263$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
264
265quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
266cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
267
Sam Ravnborg767e5812007-05-06 09:23:45 +0200268$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 $(call if_changed_dep,as_s_S)
270
271quiet_cmd_as_o_S = AS $(quiet_modtag) $@
272cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
273
Sam Ravnborg767e5812007-05-06 09:23:45 +0200274$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 $(call if_changed_dep,as_o_S)
276
277targets += $(real-objs-y) $(real-objs-m) $(lib-y)
278targets += $(extra-y) $(MAKECMDGOALS) $(always)
279
280# Linker scripts preprocessor (.lds.S -> .lds)
281# ---------------------------------------------------------------------------
282quiet_cmd_cpp_lds_S = LDS $@
283 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
284
Sam Ravnborg767e5812007-05-06 09:23:45 +0200285$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 $(call if_changed_dep,cpp_lds_S)
287
288# Build the compiled-in targets
289# ---------------------------------------------------------------------------
290
291# To build objects in subdirs, we need to descend into the directories
292$(sort $(subdir-obj-y)): $(subdir-ym) ;
293
294#
295# Rule to compile a set of .o files into one .o file
296#
297ifdef builtin-target
298quiet_cmd_link_o_target = LD $@
299# If the list of objects to link is empty, just create an empty built-in.o
300cmd_link_o_target = $(if $(strip $(obj-y)),\
Sam Ravnborg91341d42008-01-21 21:31:44 +0100301 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
302 $(cmd_secanalysis),\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 rm -f $@; $(AR) rcs $@)
304
305$(builtin-target): $(obj-y) FORCE
306 $(call if_changed,link_o_target)
307
308targets += $(builtin-target)
309endif # builtin-target
310
311#
Tejun Heo551559e2007-12-07 21:04:30 +0900312# Rule to create modules.order file
313#
314# Create commands to either record .ko file or cat modules.order from
315# a subdirectory
316modorder-cmds = \
317 $(foreach m, $(modorder), \
318 $(if $(filter %/modules.order, $m), \
319 cat $m;, echo kernel/$m;))
320
321$(modorder-target): $(subdir-ym) FORCE
322 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
323
324#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325# Rule to compile a set of .o files into one .a file
326#
327ifdef lib-target
328quiet_cmd_link_l_target = AR $@
Sam Ravnborg5e54d5e2007-09-30 20:14:58 +0200329cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331$(lib-target): $(lib-y) FORCE
332 $(call if_changed,link_l_target)
333
334targets += $(lib-target)
335endif
336
337#
338# Rule to link composite objects
339#
340# Composite objects are specified in kbuild makefile as follows:
341# <composite-object>-objs := <list of .o files>
342# or
343# <composite-object>-y := <list of .o files>
344link_multi_deps = \
345$(filter $(addprefix $(obj)/, \
346$($(subst $(obj)/,,$(@:.o=-objs))) \
347$($(subst $(obj)/,,$(@:.o=-y)))), $^)
348
349quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100350cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700353cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355# We would rather have a list of rules like
356# foo.o: $(foo-objs)
357# but that's not so easy, so we rather make all composite objects depend
358# on the set of all their parts
359$(multi-used-y) : %.o: $(multi-objs-y) FORCE
360 $(call if_changed,link_multi-y)
361
362$(multi-used-m) : %.o: $(multi-objs-m) FORCE
363 $(call if_changed,link_multi-m)
364 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
365
366targets += $(multi-used-y) $(multi-used-m)
367
368
369# Descending
370# ---------------------------------------------------------------------------
371
Paul Smith4f193362006-03-05 17:14:10 -0500372PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373$(subdir-ym):
374 $(Q)$(MAKE) $(build)=$@
375
376# Add FORCE to the prequisites of a target to force it to be always rebuilt.
377# ---------------------------------------------------------------------------
378
Paul Smith4f193362006-03-05 17:14:10 -0500379PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380
381FORCE:
382
383# Read all saved command lines and dependencies for the $(targets) we
384# may be building above, using $(if_changed{,_dep}). As an
385# optimization, we don't need to read them if the target does not
386# exist, we will rebuild anyway in that case.
387
388targets := $(wildcard $(sort $(targets)))
389cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
390
391ifneq ($(cmd_files),)
392 include $(cmd_files)
393endif
Paul Smith4f193362006-03-05 17:14:10 -0500394
395
396# Declare the contents of the .PHONY variable as phony. We keep that
397# information in a variable se we can use it in if_changed and friends.
398
399.PHONY: $(PHONY)