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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 :=
25
Linus Torvalds1da177e2005-04-16 15:20:36 -070026# Read .config if it exist, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070027-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Sam Ravnborg20a468b2006-01-22 13:34:15 +010029include scripts/Kbuild.include
30
Sam Ravnborg2a691472005-07-25 20:26:04 +000031# The filename Kbuild has precedence over Makefile
Sam Ravnborgdb8c1a72005-07-27 22:11:01 +020032kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
33include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
35include scripts/Makefile.lib
36
37ifdef host-progs
38ifneq ($(hostprogs-y),$(host-progs))
39$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
40hostprogs-y += $(host-progs)
41endif
42endif
43
44# Do not include host rules unles needed
45ifneq ($(hostprogs-y)$(hostprogs-m),)
46include scripts/Makefile.host
47endif
48
49ifneq ($(KBUILD_SRC),)
50# Create output directory if not already present
51_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
52
53# Create directories for object files if directory does not exist
54# Needed when obj-y := dir/file.o syntax is used
55_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
56endif
57
58
59ifdef EXTRA_TARGETS
60$(warning kbuild: $(obj)/Makefile - Usage of EXTRA_TARGETS is obsolete in 2.6. Please fix!)
61endif
62
63ifdef build-targets
64$(warning kbuild: $(obj)/Makefile - Usage of build-targets is obsolete in 2.6. Please fix!)
65endif
66
67ifdef export-objs
68$(warning kbuild: $(obj)/Makefile - Usage of export-objs is obsolete in 2.6. Please fix!)
69endif
70
71ifdef O_TARGET
72$(warning kbuild: $(obj)/Makefile - Usage of O_TARGET := $(O_TARGET) is obsolete in 2.6. Please fix!)
73endif
74
75ifdef L_TARGET
76$(error kbuild: $(obj)/Makefile - Use of L_TARGET is replaced by lib-y in 2.6. Please fix!)
77endif
78
79ifdef list-multi
80$(warning kbuild: $(obj)/Makefile - list-multi := $(list-multi) is obsolete in 2.6. Please fix!)
81endif
82
83ifndef obj
84$(warning kbuild: Makefile.build is included improperly)
85endif
86
87# ===========================================================================
88
89ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
90lib-target := $(obj)/lib.a
91endif
92
93ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
94builtin-target := $(obj)/built-in.o
95endif
96
97# We keep a list of all modules in $(MODVERDIR)
98
99__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
100 $(if $(KBUILD_MODULES),$(obj-m)) \
101 $(subdir-ym) $(always)
102 @:
103
104# Linus' kernel sanity checking tool
105ifneq ($(KBUILD_CHECKSRC),0)
106 ifeq ($(KBUILD_CHECKSRC),2)
107 quiet_cmd_force_checksrc = CHECK $<
108 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
109 else
110 quiet_cmd_checksrc = CHECK $<
111 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
112 endif
113endif
114
115
116# Compile C sources (.c)
117# ---------------------------------------------------------------------------
118
119# Default is built-in, unless we know otherwise
120modkern_cflags := $(CFLAGS_KERNEL)
121quiet_modtag := $(empty) $(empty)
122
123$(real-objs-m) : modkern_cflags := $(CFLAGS_MODULE)
124$(real-objs-m:.o=.i) : modkern_cflags := $(CFLAGS_MODULE)
125$(real-objs-m:.o=.s) : modkern_cflags := $(CFLAGS_MODULE)
126$(real-objs-m:.o=.lst): modkern_cflags := $(CFLAGS_MODULE)
127
128$(real-objs-m) : quiet_modtag := [M]
129$(real-objs-m:.o=.i) : quiet_modtag := [M]
130$(real-objs-m:.o=.s) : quiet_modtag := [M]
131$(real-objs-m:.o=.lst): quiet_modtag := [M]
132
133$(obj-m) : quiet_modtag := [M]
134
135# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200136modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138$(multi-objs-m) : modname = $(modname-multi)
139$(multi-objs-m:.o=.i) : modname = $(modname-multi)
140$(multi-objs-m:.o=.s) : modname = $(modname-multi)
141$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
142$(multi-objs-y) : modname = $(modname-multi)
143$(multi-objs-y:.o=.i) : modname = $(modname-multi)
144$(multi-objs-y:.o=.s) : modname = $(modname-multi)
145$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
146
147quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Chuck Ebbert7d185982006-03-07 23:58:33 -0800148cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Sam Ravnborg767e5812007-05-06 09:23:45 +0200150$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 $(call if_changed_dep,cc_s_c)
152
153quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
154cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
155
Sam Ravnborg767e5812007-05-06 09:23:45 +0200156$(obj)/%.i: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 $(call if_changed_dep,cc_i_c)
158
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200159quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
160cmd_cc_symtypes_c = \
161 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
162 | $(GENKSYMS) -T $@ >/dev/null; \
163 test -s $@ || rm -f $@
164
Sam Ravnborg767e5812007-05-06 09:23:45 +0200165$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200166 $(call if_changed_dep,cc_symtypes_c)
167
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168# C (.c) files
169# The C file is compiled and updated dependency information is generated.
170# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
171
172quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
173
174ifndef CONFIG_MODVERSIONS
175cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
176
177else
178# When module versioning is enabled the following steps are executed:
179# o compile a .tmp_<file>.o from <file>.c
180# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
181# not export symbols, we just rename .tmp_<file>.o to <file>.o and
182# are done.
183# o otherwise, we calculate symbol versions using the good old
184# genksyms on the preprocessed source and postprocess them in a way
185# that they are usable as a linker script
186# o generate <file>.o from .tmp_<file>.o using the linker to
187# replace the unresolved symbols __crc_exported_symbol with
188# the actual value of the checksum generated by genksyms
189
190cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
191cmd_modversions = \
192 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
193 $(CPP) -D__GENKSYMS__ $(c_flags) $< \
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200194 | $(GENKSYMS) $(if $(KBUILD_SYMTYPES), \
195 -T $(@D)/$(@F:.o=.symtypes)) -a $(ARCH) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 > $(@D)/.tmp_$(@F:.o=.ver); \
197 \
198 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
199 -T $(@D)/.tmp_$(@F:.o=.ver); \
200 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
201 else \
Sam Ravnborgcfca82f2005-07-14 20:12:40 +0000202 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 fi;
204endif
205
206define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100207 $(call echo-cmd,checksrc) $(cmd_checksrc) \
208 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 $(cmd_modversions) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200210 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
211 $(dot-target).tmp; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200213 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214endef
215
216# Built-in and composite module parts
Sam Ravnborg767e5812007-05-06 09:23:45 +0200217$(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 $(call cmd,force_checksrc)
219 $(call if_changed_rule,cc_o_c)
220
221# Single-part modules are special since we need to mark them in $(MODVERDIR)
222
Sam Ravnborg767e5812007-05-06 09:23:45 +0200223$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 $(call cmd,force_checksrc)
225 $(call if_changed_rule,cc_o_c)
226 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
227
228quiet_cmd_cc_lst_c = MKLST $@
229 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
230 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
231 System.map $(OBJDUMP) > $@
232
Sam Ravnborg767e5812007-05-06 09:23:45 +0200233$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 $(call if_changed_dep,cc_lst_c)
235
236# Compile assembler sources (.S)
237# ---------------------------------------------------------------------------
238
239modkern_aflags := $(AFLAGS_KERNEL)
240
241$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
242$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
243
244quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
245cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
246
Sam Ravnborg767e5812007-05-06 09:23:45 +0200247$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 $(call if_changed_dep,as_s_S)
249
250quiet_cmd_as_o_S = AS $(quiet_modtag) $@
251cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
252
Sam Ravnborg767e5812007-05-06 09:23:45 +0200253$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 $(call if_changed_dep,as_o_S)
255
256targets += $(real-objs-y) $(real-objs-m) $(lib-y)
257targets += $(extra-y) $(MAKECMDGOALS) $(always)
258
259# Linker scripts preprocessor (.lds.S -> .lds)
260# ---------------------------------------------------------------------------
261quiet_cmd_cpp_lds_S = LDS $@
262 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $<
263
Sam Ravnborg767e5812007-05-06 09:23:45 +0200264$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 $(call if_changed_dep,cpp_lds_S)
266
267# Build the compiled-in targets
268# ---------------------------------------------------------------------------
269
270# To build objects in subdirs, we need to descend into the directories
271$(sort $(subdir-obj-y)): $(subdir-ym) ;
272
273#
274# Rule to compile a set of .o files into one .o file
275#
276ifdef builtin-target
277quiet_cmd_link_o_target = LD $@
278# If the list of objects to link is empty, just create an empty built-in.o
279cmd_link_o_target = $(if $(strip $(obj-y)),\
280 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^),\
281 rm -f $@; $(AR) rcs $@)
282
283$(builtin-target): $(obj-y) FORCE
284 $(call if_changed,link_o_target)
285
286targets += $(builtin-target)
287endif # builtin-target
288
289#
290# Rule to compile a set of .o files into one .a file
291#
292ifdef lib-target
293quiet_cmd_link_l_target = AR $@
294cmd_link_l_target = rm -f $@; $(AR) $(EXTRA_ARFLAGS) rcs $@ $(lib-y)
295
296$(lib-target): $(lib-y) FORCE
297 $(call if_changed,link_l_target)
298
299targets += $(lib-target)
300endif
301
302#
303# Rule to link composite objects
304#
305# Composite objects are specified in kbuild makefile as follows:
306# <composite-object>-objs := <list of .o files>
307# or
308# <composite-object>-y := <list of .o files>
309link_multi_deps = \
310$(filter $(addprefix $(obj)/, \
311$($(subst $(obj)/,,$(@:.o=-objs))) \
312$($(subst $(obj)/,,$(@:.o=-y)))), $^)
313
314quiet_cmd_link_multi-y = LD $@
315cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps)
316
317quiet_cmd_link_multi-m = LD [M] $@
318cmd_link_multi-m = $(LD) $(ld_flags) $(LDFLAGS_MODULE) -o $@ $(link_multi_deps)
319
320# We would rather have a list of rules like
321# foo.o: $(foo-objs)
322# but that's not so easy, so we rather make all composite objects depend
323# on the set of all their parts
324$(multi-used-y) : %.o: $(multi-objs-y) FORCE
325 $(call if_changed,link_multi-y)
326
327$(multi-used-m) : %.o: $(multi-objs-m) FORCE
328 $(call if_changed,link_multi-m)
329 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
330
331targets += $(multi-used-y) $(multi-used-m)
332
333
334# Descending
335# ---------------------------------------------------------------------------
336
Paul Smith4f193362006-03-05 17:14:10 -0500337PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338$(subdir-ym):
339 $(Q)$(MAKE) $(build)=$@
340
341# Add FORCE to the prequisites of a target to force it to be always rebuilt.
342# ---------------------------------------------------------------------------
343
Paul Smith4f193362006-03-05 17:14:10 -0500344PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346FORCE:
347
348# Read all saved command lines and dependencies for the $(targets) we
349# may be building above, using $(if_changed{,_dep}). As an
350# optimization, we don't need to read them if the target does not
351# exist, we will rebuild anyway in that case.
352
353targets := $(wildcard $(sort $(targets)))
354cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
355
356ifneq ($(cmd_files),)
357 include $(cmd_files)
358endif
Paul Smith4f193362006-03-05 17:14:10 -0500359
360
361# Declare the contents of the .PHONY variable as phony. We keep that
362# information in a variable se we can use it in if_changed and friends.
363
364.PHONY: $(PHONY)