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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
Sam Ravnborg720097d2009-04-19 11:04:26 +020030subdir-asflags-y :=
31subdir-ccflags-y :=
32
Robert P. J. Day3156fd02008-02-18 04:48:20 -050033# Read auto.conf if it exists, otherwise ignore
Roman Zippelc955cca2006-06-08 22:12:39 -070034-include include/config/auto.conf
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
Sam Ravnborg20a468b2006-01-22 13:34:15 +010036include scripts/Kbuild.include
37
Robert P. J. Day3156fd02008-02-18 04:48:20 -050038# For backward compatibility check that these variables do not change
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020039save-cflags := $(CFLAGS)
40
Sam Ravnborg2a691472005-07-25 20:26:04 +000041# The filename Kbuild has precedence over Makefile
Sam Ravnborgdb8c1a72005-07-27 22:11:01 +020042kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020043kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
44include $(kbuild-file)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Sam Ravnborg0c53c8e2007-10-14 22:26:53 +020046# If the save-* variables changed error out
47ifeq ($(KBUILD_NOPEDANTIC),)
48 ifneq ("$(save-cflags)","$(CFLAGS)")
49 $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
50 endif
51endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070052include scripts/Makefile.lib
53
54ifdef host-progs
55ifneq ($(hostprogs-y),$(host-progs))
56$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
57hostprogs-y += $(host-progs)
58endif
59endif
60
Robert P. J. Day3156fd02008-02-18 04:48:20 -050061# Do not include host rules unless needed
Linus Torvalds1da177e2005-04-16 15:20:36 -070062ifneq ($(hostprogs-y)$(hostprogs-m),)
63include scripts/Makefile.host
64endif
65
66ifneq ($(KBUILD_SRC),)
67# Create output directory if not already present
68_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
69
70# Create directories for object files if directory does not exist
71# Needed when obj-y := dir/file.o syntax is used
72_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
73endif
74
Linus Torvalds1da177e2005-04-16 15:20:36 -070075ifndef obj
76$(warning kbuild: Makefile.build is included improperly)
77endif
78
79# ===========================================================================
80
81ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
82lib-target := $(obj)/lib.a
83endif
84
85ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),)
86builtin-target := $(obj)/built-in.o
87endif
88
Tejun Heo551559e2007-12-07 21:04:30 +090089modorder-target := $(obj)/modules.order
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091# We keep a list of all modules in $(MODVERDIR)
92
93__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +090094 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 $(subdir-ym) $(always)
96 @:
97
98# Linus' kernel sanity checking tool
99ifneq ($(KBUILD_CHECKSRC),0)
100 ifeq ($(KBUILD_CHECKSRC),2)
101 quiet_cmd_force_checksrc = CHECK $<
102 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
103 else
104 quiet_cmd_checksrc = CHECK $<
105 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
106 endif
107endif
108
Sam Ravnborg91341d42008-01-21 21:31:44 +0100109# Do section mismatch analysis for each module/built-in.o
110ifdef CONFIG_DEBUG_SECTION_MISMATCH
111 cmd_secanalysis = ; scripts/mod/modpost $@
112endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114# Compile C sources (.c)
115# ---------------------------------------------------------------------------
116
117# Default is built-in, unless we know otherwise
Shaohua Li18c167f2009-01-12 10:00:51 +0800118modkern_cflags = $(if $(part-of-module), $(CFLAGS_MODULE), $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119quiet_modtag := $(empty) $(empty)
120
Shaohua Li18c167f2009-01-12 10:00:51 +0800121$(real-objs-m) : part-of-module := y
122$(real-objs-m:.o=.i) : part-of-module := y
123$(real-objs-m:.o=.s) : part-of-module := y
124$(real-objs-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126$(real-objs-m) : quiet_modtag := [M]
127$(real-objs-m:.o=.i) : quiet_modtag := [M]
128$(real-objs-m:.o=.s) : quiet_modtag := [M]
129$(real-objs-m:.o=.lst): quiet_modtag := [M]
130
131$(obj-m) : quiet_modtag := [M]
132
133# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200134modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136$(multi-objs-m) : modname = $(modname-multi)
137$(multi-objs-m:.o=.i) : modname = $(modname-multi)
138$(multi-objs-m:.o=.s) : modname = $(modname-multi)
139$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
140$(multi-objs-y) : modname = $(modname-multi)
141$(multi-objs-y:.o=.i) : modname = $(modname-multi)
142$(multi-objs-y:.o=.s) : modname = $(modname-multi)
143$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
144
145quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Chuck Ebbert7d185982006-03-07 23:58:33 -0800146cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Sam Ravnborg767e5812007-05-06 09:23:45 +0200148$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 $(call if_changed_dep,cc_s_c)
150
151quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
152cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
153
Sam Ravnborg767e5812007-05-06 09:23:45 +0200154$(obj)/%.i: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 $(call if_changed_dep,cc_i_c)
156
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100157cmd_gensymtypes = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100158 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100159 $(GENKSYMS) -T $@ -a $(ARCH) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100160 $(if $(KBUILD_PRESERVE),-p) \
161 $(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null)))
162
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200163quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100164cmd_cc_symtypes_c = \
165 set -e; \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100166 $(call cmd_gensymtypes, true) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100167 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200168
Sam Ravnborg767e5812007-05-06 09:23:45 +0200169$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800170 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172# C (.c) files
173# The C file is compiled and updated dependency information is generated.
174# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
175
176quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
177
178ifndef CONFIG_MODVERSIONS
179cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
180
181else
182# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100183# o compile a .tmp_<file>.o from <file>.c
184# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
185# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186# are done.
187# o otherwise, we calculate symbol versions using the good old
188# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100189# that they are usable as a linker script
190# o generate <file>.o from .tmp_<file>.o using the linker to
191# replace the unresolved symbols __crc_exported_symbol with
192# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100194cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195cmd_modversions = \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100196 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
197 $(call cmd_gensymtypes, $(KBUILD_SYMTYPES)) \
198 > $(@D)/.tmp_$(@F:.o=.ver); \
199 \
200 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
201 -T $(@D)/.tmp_$(@F:.o=.ver); \
202 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 else \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100204 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 fi;
206endif
207
Steven Rostedt8da38212008-08-14 15:45:07 -0400208ifdef CONFIG_FTRACE_MCOUNT_RECORD
Andi Kleen66a57062009-09-18 12:49:37 -0700209cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400210 "$(if $(CONFIG_64BIT),64,32)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800211 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
212 "$(if $(part-of-module),1,0)" "$(@)";
Steven Rostedt8da38212008-08-14 15:45:07 -0400213endif
214
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100216 $(call echo-cmd,checksrc) $(cmd_checksrc) \
217 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 $(cmd_modversions) \
Andi Kleenc3c63b62009-09-18 12:49:36 -0700219 $(call echo-cmd,record_mcount) \
Steven Rostedt8da38212008-08-14 15:45:07 -0400220 $(cmd_record_mcount) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200221 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
222 $(dot-target).tmp; \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100223 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200224 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225endef
226
227# Built-in and composite module parts
Sam Ravnborg767e5812007-05-06 09:23:45 +0200228$(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 $(call cmd,force_checksrc)
230 $(call if_changed_rule,cc_o_c)
231
232# Single-part modules are special since we need to mark them in $(MODVERDIR)
233
Sam Ravnborg767e5812007-05-06 09:23:45 +0200234$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 $(call cmd,force_checksrc)
236 $(call if_changed_rule,cc_o_c)
237 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
238
239quiet_cmd_cc_lst_c = MKLST $@
240 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
241 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
242 System.map $(OBJDUMP) > $@
243
Sam Ravnborg767e5812007-05-06 09:23:45 +0200244$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 $(call if_changed_dep,cc_lst_c)
246
247# Compile assembler sources (.S)
248# ---------------------------------------------------------------------------
249
250modkern_aflags := $(AFLAGS_KERNEL)
251
252$(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE)
253$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
254
255quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
256cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
257
Sam Ravnborg767e5812007-05-06 09:23:45 +0200258$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 $(call if_changed_dep,as_s_S)
260
261quiet_cmd_as_o_S = AS $(quiet_modtag) $@
262cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
263
Sam Ravnborg767e5812007-05-06 09:23:45 +0200264$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 $(call if_changed_dep,as_o_S)
266
267targets += $(real-objs-y) $(real-objs-m) $(lib-y)
268targets += $(extra-y) $(MAKECMDGOALS) $(always)
269
270# Linker scripts preprocessor (.lds.S -> .lds)
271# ---------------------------------------------------------------------------
272quiet_cmd_cpp_lds_S = LDS $@
Sam Ravnborg51b563f2009-09-20 12:28:22 +0200273 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
274 -D__ASSEMBLY__ -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275
Sam Ravnborg767e5812007-05-06 09:23:45 +0200276$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 $(call if_changed_dep,cpp_lds_S)
278
279# Build the compiled-in targets
280# ---------------------------------------------------------------------------
281
282# To build objects in subdirs, we need to descend into the directories
283$(sort $(subdir-obj-y)): $(subdir-ym) ;
284
285#
286# Rule to compile a set of .o files into one .o file
287#
288ifdef builtin-target
289quiet_cmd_link_o_target = LD $@
290# If the list of objects to link is empty, just create an empty built-in.o
291cmd_link_o_target = $(if $(strip $(obj-y)),\
Sam Ravnborg91341d42008-01-21 21:31:44 +0100292 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
293 $(cmd_secanalysis),\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 rm -f $@; $(AR) rcs $@)
295
296$(builtin-target): $(obj-y) FORCE
297 $(call if_changed,link_o_target)
298
299targets += $(builtin-target)
300endif # builtin-target
301
302#
Tejun Heo551559e2007-12-07 21:04:30 +0900303# Rule to create modules.order file
304#
305# Create commands to either record .ko file or cat modules.order from
306# a subdirectory
307modorder-cmds = \
308 $(foreach m, $(modorder), \
309 $(if $(filter %/modules.order, $m), \
310 cat $m;, echo kernel/$m;))
311
312$(modorder-target): $(subdir-ym) FORCE
313 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
314
315#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316# Rule to compile a set of .o files into one .a file
317#
318ifdef lib-target
319quiet_cmd_link_l_target = AR $@
Sam Ravnborg5e54d5e2007-09-30 20:14:58 +0200320cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322$(lib-target): $(lib-y) FORCE
323 $(call if_changed,link_l_target)
324
325targets += $(lib-target)
326endif
327
328#
329# Rule to link composite objects
330#
331# Composite objects are specified in kbuild makefile as follows:
332# <composite-object>-objs := <list of .o files>
333# or
334# <composite-object>-y := <list of .o files>
335link_multi_deps = \
336$(filter $(addprefix $(obj)/, \
337$($(subst $(obj)/,,$(@:.o=-objs))) \
338$($(subst $(obj)/,,$(@:.o=-y)))), $^)
339
340quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100341cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700344cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346# We would rather have a list of rules like
347# foo.o: $(foo-objs)
348# but that's not so easy, so we rather make all composite objects depend
349# on the set of all their parts
350$(multi-used-y) : %.o: $(multi-objs-y) FORCE
351 $(call if_changed,link_multi-y)
352
353$(multi-used-m) : %.o: $(multi-objs-m) FORCE
354 $(call if_changed,link_multi-m)
355 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
356
357targets += $(multi-used-y) $(multi-used-m)
358
359
360# Descending
361# ---------------------------------------------------------------------------
362
Paul Smith4f193362006-03-05 17:14:10 -0500363PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364$(subdir-ym):
365 $(Q)$(MAKE) $(build)=$@
366
367# Add FORCE to the prequisites of a target to force it to be always rebuilt.
368# ---------------------------------------------------------------------------
369
Paul Smith4f193362006-03-05 17:14:10 -0500370PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371
372FORCE:
373
374# Read all saved command lines and dependencies for the $(targets) we
375# may be building above, using $(if_changed{,_dep}). As an
376# optimization, we don't need to read them if the target does not
377# exist, we will rebuild anyway in that case.
378
379targets := $(wildcard $(sort $(targets)))
380cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
381
382ifneq ($(cmd_files),)
383 include $(cmd_files)
384endif
Paul Smith4f193362006-03-05 17:14:10 -0500385
386
387# Declare the contents of the .PHONY variable as phony. We keep that
388# information in a variable se we can use it in if_changed and friends.
389
390.PHONY: $(PHONY)