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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
10# Read .config if it exist, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070011-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070012
Sam Ravnborg20a468b2006-01-22 13:34:15 +010013include scripts/Kbuild.include
14
Sam Ravnborg2a691472005-07-25 20:26:04 +000015# The filename Kbuild has precedence over Makefile
Sam Ravnborgdb8c1a72005-07-27 22:11:01 +020016kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
17include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile)
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19include scripts/Makefile.lib
20
21ifdef host-progs
22ifneq ($(hostprogs-y),$(host-progs))
23$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
24hostprogs-y += $(host-progs)
25endif
26endif
27
28# Do not include host rules unles needed
29ifneq ($(hostprogs-y)$(hostprogs-m),)
30include scripts/Makefile.host
31endif
32
33ifneq ($(KBUILD_SRC),)
34# Create output directory if not already present
35_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
36
37# Create directories for object files if directory does not exist
38# Needed when obj-y := dir/file.o syntax is used
39_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
40endif
41
42
43ifdef EXTRA_TARGETS
44$(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
45endif
46
47ifdef build-targets
48$(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
49endif
50
51ifdef export-objs
52$(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
53endif
54
55ifdef O_TARGET
56$(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
57endif
58
59ifdef L_TARGET
60$(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
61endif
62
63ifdef list-multi
64$(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
65endif
66
67ifndef obj
68$(warning kbuild: Makefile.build is included improperly)
69endif
70
71# ===========================================================================
72
73ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
74lib-target := $(obj)/lib.a
75endif
76
77ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
78builtin-target := $(obj)/built-in.o
79endif
80
81# We keep a list of all modules in $(MODVERDIR)
82
83__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
84 $(if $(KBUILD_MODULES),$(obj-m)) \
85 $(subdir-ym) $(always)
86 @:
87
88# Linus' kernel sanity checking tool
89ifneq ($(KBUILD_CHECKSRC),0)
90 ifeq ($(KBUILD_CHECKSRC),2)
91 quiet_cmd_force_checksrc = CHECK $<
92 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
93 else
94 quiet_cmd_checksrc = CHECK $<
95 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
96 endif
97endif
98
99
100# Compile C sources (.c)
101# ---------------------------------------------------------------------------
102
103# Default is built-in, unless we know otherwise
104modkern_cflags := $(CFLAGS_KERNEL)
105quiet_modtag := $(empty) $(empty)
106
107$(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
108$(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
109$(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
110$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
111
112$(real-objs-m) : quiet_modtag := [M]
113$(real-objs-m:.o=.i) : quiet_modtag := [M]
114$(real-objs-m:.o=.s) : quiet_modtag := [M]
115$(real-objs-m:.o=.lst): quiet_modtag := [M]
116
117$(obj-m) : quiet_modtag := [M]
118
119# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200120modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122$(multi-objs-m) : modname = $(modname-multi)
123$(multi-objs-m:.o=.i) : modname = $(modname-multi)
124$(multi-objs-m:.o=.s) : modname = $(modname-multi)
125$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
126$(multi-objs-y) : modname = $(modname-multi)
127$(multi-objs-y:.o=.i) : modname = $(modname-multi)
128$(multi-objs-y:.o=.s) : modname = $(modname-multi)
129$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
130
131quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Chuck Ebbert7d185982006-03-07 23:58:33 -0800132cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Sam Ravnborg767e5812007-05-06 09:23:45 +0200134$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135 $(call if_changed_dep,cc_s_c)
136
137quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
138cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
139
Sam Ravnborg767e5812007-05-06 09:23:45 +0200140$(obj)/%.i: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 $(call if_changed_dep,cc_i_c)
142
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200143quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
144cmd_cc_symtypes_c = \
145 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
146 | $(GENKSYMS) -T $@ >/dev/null; \
147 test -s $@ || rm -f $@
148
Sam Ravnborg767e5812007-05-06 09:23:45 +0200149$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200150 $(call if_changed_dep,cc_symtypes_c)
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152# C (.c) files
153# The C file is compiled and updated dependency information is generated.
154# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
155
156quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
157
158ifndef CONFIG_MODVERSIONS
159cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
160
161else
162# When module versioning is enabled the following steps are executed:
163# o compile a .tmp_<file>.o from <file>.c
164# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
165# not export symbols, we just rename .tmp_<file>.o to <file>.o and
166# are done.
167# o otherwise, we calculate symbol versions using the good old
168# genksyms on the preprocessed source and postprocess them in a way
169# that they are usable as a linker script
170# o generate <file>.o from .tmp_<file>.o using the linker to
171# replace the unresolved symbols __crc_exported_symbol with
172# the actual value of the checksum generated by genksyms
173
174cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
175cmd_modversions = \
176 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
177 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200178 | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \
179 -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 > $(@D)/.tmp_$(@F:.o=.ver); \
181 \
182 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
183 -T $(@D)/.tmp_$(@F:.o=.ver); \
184 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
185 else \
Sam Ravnborgcfca82f2005-07-14 20:12:40 +0000186 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 fi;
188endif
189
190define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100191 $(call echo-cmd,checksrc) $(cmd_checksrc) \
192 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 $(cmd_modversions) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200194 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
195 $(dot-target).tmp; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200197 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198endef
199
200# Built-in and composite module parts
Sam Ravnborg767e5812007-05-06 09:23:45 +0200201$(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 $(call cmd,force_checksrc)
203 $(call if_changed_rule,cc_o_c)
204
205# Single-part modules are special since we need to mark them in $(MODVERDIR)
206
Sam Ravnborg767e5812007-05-06 09:23:45 +0200207$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 $(call cmd,force_checksrc)
209 $(call if_changed_rule,cc_o_c)
210 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
211
212quiet_cmd_cc_lst_c = MKLST $@
213 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
214 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
215 System.map $(OBJDUMP) > $@
216
Sam Ravnborg767e5812007-05-06 09:23:45 +0200217$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 $(call if_changed_dep,cc_lst_c)
219
220# Compile assembler sources (.S)
221# ---------------------------------------------------------------------------
222
223modkern_aflags := $(AFLAGS_KERNEL)
224
225$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
226$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
227
228quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
229cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
230
Sam Ravnborg767e5812007-05-06 09:23:45 +0200231$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 $(call if_changed_dep,as_s_S)
233
234quiet_cmd_as_o_S = AS $(quiet_modtag) $@
235cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
236
Sam Ravnborg767e5812007-05-06 09:23:45 +0200237$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 $(call if_changed_dep,as_o_S)
239
240targets += $(real-objs-y) $(real-objs-m) $(lib-y)
241targets += $(extra-y) $(MAKECMDGOALS) $(always)
242
243# Linker scripts preprocessor (.lds.S -> .lds)
244# ---------------------------------------------------------------------------
245quiet_cmd_cpp_lds_S = LDS $@
246 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
247
Sam Ravnborg767e5812007-05-06 09:23:45 +0200248$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 $(call if_changed_dep,cpp_lds_S)
250
251# Build the compiled-in targets
252# ---------------------------------------------------------------------------
253
254# To build objects in subdirs, we need to descend into the directories
255$(sort $(subdir-obj-y)): $(subdir-ym) ;
256
257#
258# Rule to compile a set of .o files into one .o file
259#
260ifdef builtin-target
261quiet_cmd_link_o_target = LD $@
262# If the list of objects to link is empty, just create an empty built-in.o
263cmd_link_o_target = $(if $(strip $(obj-y)),\
264 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
265 rm -f $@; $(AR) rcs $@)
266
267$(builtin-target): $(obj-y) FORCE
268 $(call if_changed,link_o_target)
269
270targets += $(builtin-target)
271endif # builtin-target
272
273#
274# Rule to compile a set of .o files into one .a file
275#
276ifdef lib-target
277quiet_cmd_link_l_target = AR $@
278cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
279
280$(lib-target): $(lib-y) FORCE
281 $(call if_changed,link_l_target)
282
283targets += $(lib-target)
284endif
285
286#
287# Rule to link composite objects
288#
289# Composite objects are specified in kbuild makefile as follows:
290# <composite-object>-objs := <list of .o files>
291# or
292# <composite-object>-y := <list of .o files>
293link_multi_deps = \
294$(filter $(addprefix $(obj)/, \
295$($(subst $(obj)/,,$(@:.o=-objs))) \
296$($(subst $(obj)/,,$(@:.o=-y)))), $^)
297
298quiet_cmd_link_multi-y = LD $@
299cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
300
301quiet_cmd_link_multi-m = LD [M] $@
302cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
303
304# We would rather have a list of rules like
305# foo.o: $(foo-objs)
306# but that's not so easy, so we rather make all composite objects depend
307# on the set of all their parts
308$(multi-used-y) : %.o: $(multi-objs-y) FORCE
309 $(call if_changed,link_multi-y)
310
311$(multi-used-m) : %.o: $(multi-objs-m) FORCE
312 $(call if_changed,link_multi-m)
313 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
314
315targets += $(multi-used-y) $(multi-used-m)
316
317
318# Descending
319# ---------------------------------------------------------------------------
320
Paul Smith4f193362006-03-05 17:14:10 -0500321PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322$(subdir-ym):
323 $(Q)$(MAKE) $(build)=$@
324
325# Add FORCE to the prequisites of a target to force it to be always rebuilt.
326# ---------------------------------------------------------------------------
327
Paul Smith4f193362006-03-05 17:14:10 -0500328PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330FORCE:
331
332# Read all saved command lines and dependencies for the $(targets) we
333# may be building above, using $(if_changed{,_dep}). As an
334# optimization, we don't need to read them if the target does not
335# exist, we will rebuild anyway in that case.
336
337targets := $(wildcard $(sort $(targets)))
338cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
339
340ifneq ($(cmd_files),)
341 include $(cmd_files)
342endif
Paul Smith4f193362006-03-05 17:14:10 -0500343
344
345# Declare the contents of the .PHONY variable as phony. We keep that
346# information in a variable se we can use it in if_changed and friends.
347
348.PHONY: $(PHONY)