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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
Linus Torvalds1da177e2005-04-16 15:20:36 -070030# Read .config if it exist, 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
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020035# For backward compatibility check that these variables does not change
36save-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 += $(host-progs)
55endif
56endif
57
58# Do not include host rules unles needed
59ifneq ($(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 = \
156 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
157 | $(GENKSYMS) -T $@ >/dev/null; \
158 test -s $@ || rm -f $@
159
Sam Ravnborg767e5812007-05-06 09:23:45 +0200160$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200161 $(call if_changed_dep,cc_symtypes_c)
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163# C (.c) files
164# The C file is compiled and updated dependency information is generated.
165# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
166
167quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
168
169ifndef CONFIG_MODVERSIONS
170cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
171
172else
173# When module versioning is enabled the following steps are executed:
174# o compile a .tmp_<file>.o from <file>.c
175# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
176# not export symbols, we just rename .tmp_<file>.o to <file>.o and
177# are done.
178# o otherwise, we calculate symbol versions using the good old
179# genksyms on the preprocessed source and postprocess them in a way
180# that they are usable as a linker script
181# o generate <file>.o from .tmp_<file>.o using the linker to
182# replace the unresolved symbols __crc_exported_symbol with
183# the actual value of the checksum generated by genksyms
184
185cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
186cmd_modversions = \
187 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
188 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200189 | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \
190 -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 > $(@D)/.tmp_$(@F:.o=.ver); \
192 \
193 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
194 -T $(@D)/.tmp_$(@F:.o=.ver); \
195 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
196 else \
Sam Ravnborgcfca82f2005-07-14 20:12:40 +0000197 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 fi;
199endif
200
201define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100202 $(call echo-cmd,checksrc) $(cmd_checksrc) \
203 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 $(cmd_modversions) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200205 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
206 $(dot-target).tmp; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200208 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209endef
210
211# Built-in and composite module parts
Sam Ravnborg767e5812007-05-06 09:23:45 +0200212$(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 $(call cmd,force_checksrc)
214 $(call if_changed_rule,cc_o_c)
215
216# Single-part modules are special since we need to mark them in $(MODVERDIR)
217
Sam Ravnborg767e5812007-05-06 09:23:45 +0200218$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 $(call cmd,force_checksrc)
220 $(call if_changed_rule,cc_o_c)
221 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
222
223quiet_cmd_cc_lst_c = MKLST $@
224 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
225 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
226 System.map $(OBJDUMP) > $@
227
Sam Ravnborg767e5812007-05-06 09:23:45 +0200228$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 $(call if_changed_dep,cc_lst_c)
230
231# Compile assembler sources (.S)
232# ---------------------------------------------------------------------------
233
234modkern_aflags := $(AFLAGS_KERNEL)
235
236$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
237$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
238
239quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
240cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
241
Sam Ravnborg767e5812007-05-06 09:23:45 +0200242$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 $(call if_changed_dep,as_s_S)
244
245quiet_cmd_as_o_S = AS $(quiet_modtag) $@
246cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
247
Sam Ravnborg767e5812007-05-06 09:23:45 +0200248$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 $(call if_changed_dep,as_o_S)
250
251targets += $(real-objs-y) $(real-objs-m) $(lib-y)
252targets += $(extra-y) $(MAKECMDGOALS) $(always)
253
254# Linker scripts preprocessor (.lds.S -> .lds)
255# ---------------------------------------------------------------------------
256quiet_cmd_cpp_lds_S = LDS $@
257 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
258
Sam Ravnborg767e5812007-05-06 09:23:45 +0200259$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 $(call if_changed_dep,cpp_lds_S)
261
262# Build the compiled-in targets
263# ---------------------------------------------------------------------------
264
265# To build objects in subdirs, we need to descend into the directories
266$(sort $(subdir-obj-y)): $(subdir-ym) ;
267
268#
269# Rule to compile a set of .o files into one .o file
270#
271ifdef builtin-target
272quiet_cmd_link_o_target = LD $@
273# If the list of objects to link is empty, just create an empty built-in.o
274cmd_link_o_target = $(if $(strip $(obj-y)),\
Sam Ravnborg91341d42008-01-21 21:31:44 +0100275 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
276 $(cmd_secanalysis),\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 rm -f $@; $(AR) rcs $@)
278
279$(builtin-target): $(obj-y) FORCE
280 $(call if_changed,link_o_target)
281
282targets += $(builtin-target)
283endif # builtin-target
284
285#
Tejun Heo551559e2007-12-07 21:04:30 +0900286# Rule to create modules.order file
287#
288# Create commands to either record .ko file or cat modules.order from
289# a subdirectory
290modorder-cmds = \
291 $(foreach m, $(modorder), \
292 $(if $(filter %/modules.order, $m), \
293 cat $m;, echo kernel/$m;))
294
295$(modorder-target): $(subdir-ym) FORCE
296 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
297
298#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299# Rule to compile a set of .o files into one .a file
300#
301ifdef lib-target
302quiet_cmd_link_l_target = AR $@
Sam Ravnborg5e54d5e2007-09-30 20:14:58 +0200303cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305$(lib-target): $(lib-y) FORCE
306 $(call if_changed,link_l_target)
307
308targets += $(lib-target)
309endif
310
311#
312# Rule to link composite objects
313#
314# Composite objects are specified in kbuild makefile as follows:
315# <composite-object>-objs := <list of .o files>
316# or
317# <composite-object>-y := <list of .o files>
318link_multi_deps = \
319$(filter $(addprefix $(obj)/, \
320$($(subst $(obj)/,,$(@:.o=-objs))) \
321$($(subst $(obj)/,,$(@:.o=-y)))), $^)
322
323quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100324cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
326quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700327cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329# We would rather have a list of rules like
330# foo.o: $(foo-objs)
331# but that's not so easy, so we rather make all composite objects depend
332# on the set of all their parts
333$(multi-used-y) : %.o: $(multi-objs-y) FORCE
334 $(call if_changed,link_multi-y)
335
336$(multi-used-m) : %.o: $(multi-objs-m) FORCE
337 $(call if_changed,link_multi-m)
338 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
339
340targets += $(multi-used-y) $(multi-used-m)
341
342
343# Descending
344# ---------------------------------------------------------------------------
345
Paul Smith4f193362006-03-05 17:14:10 -0500346PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347$(subdir-ym):
348 $(Q)$(MAKE) $(build)=$@
349
350# Add FORCE to the prequisites of a target to force it to be always rebuilt.
351# ---------------------------------------------------------------------------
352
Paul Smith4f193362006-03-05 17:14:10 -0500353PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355FORCE:
356
357# Read all saved command lines and dependencies for the $(targets) we
358# may be building above, using $(if_changed{,_dep}). As an
359# optimization, we don't need to read them if the target does not
360# exist, we will rebuild anyway in that case.
361
362targets := $(wildcard $(sort $(targets)))
363cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
364
365ifneq ($(cmd_files),)
366 include $(cmd_files)
367endif
Paul Smith4f193362006-03-05 17:14:10 -0500368
369
370# Declare the contents of the .PHONY variable as phony. We keep that
371# information in a variable se we can use it in if_changed and friends.
372
373.PHONY: $(PHONY)