blob: 6165622c3e29ae4cb395a1182045a905b603d7f4 [file] [log] [blame]
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
Borislav Petkov4a5838a2011-03-01 09:35:29 +010052
53#
54# make W=1 settings
55#
56# $(call cc-option... ) handles gcc -W.. options which
57# are not supported by all versions of the compiler
58ifdef KBUILD_ENABLE_EXTRA_GCC_CHECKS
59KBUILD_EXTRA_WARNINGS := -Wextra
60KBUILD_EXTRA_WARNINGS += -Wunused -Wno-unused-parameter
61KBUILD_EXTRA_WARNINGS += -Waggregate-return
62KBUILD_EXTRA_WARNINGS += -Wbad-function-cast
63KBUILD_EXTRA_WARNINGS += -Wcast-qual
64KBUILD_EXTRA_WARNINGS += -Wcast-align
65KBUILD_EXTRA_WARNINGS += -Wconversion
66KBUILD_EXTRA_WARNINGS += -Wdisabled-optimization
67KBUILD_EXTRA_WARNINGS += -Wlogical-op
68KBUILD_EXTRA_WARNINGS += -Wmissing-declarations
69KBUILD_EXTRA_WARNINGS += -Wmissing-format-attribute
70KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wmissing-include-dirs,)
71KBUILD_EXTRA_WARNINGS += -Wmissing-prototypes
72KBUILD_EXTRA_WARNINGS += -Wnested-externs
73KBUILD_EXTRA_WARNINGS += -Wold-style-definition
74KBUILD_EXTRA_WARNINGS += $(call cc-option, -Woverlength-strings,)
75KBUILD_EXTRA_WARNINGS += -Wpacked
76KBUILD_EXTRA_WARNINGS += -Wpacked-bitfield-compat
77KBUILD_EXTRA_WARNINGS += -Wpadded
78KBUILD_EXTRA_WARNINGS += -Wpointer-arith
79KBUILD_EXTRA_WARNINGS += -Wredundant-decls
80KBUILD_EXTRA_WARNINGS += -Wshadow
81KBUILD_EXTRA_WARNINGS += -Wswitch-default
82KBUILD_EXTRA_WARNINGS += $(call cc-option, -Wvla,)
83KBUILD_CFLAGS += $(KBUILD_EXTRA_WARNINGS)
84endif
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086include scripts/Makefile.lib
87
88ifdef host-progs
89ifneq ($(hostprogs-y),$(host-progs))
90$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
91hostprogs-y += $(host-progs)
92endif
93endif
94
Robert P. J. Day3156fd02008-02-18 04:48:20 -050095# Do not include host rules unless needed
Linus Torvalds1da177e2005-04-16 15:20:36 -070096ifneq ($(hostprogs-y)$(hostprogs-m),)
97include scripts/Makefile.host
98endif
99
100ifneq ($(KBUILD_SRC),)
101# Create output directory if not already present
102_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))
103
104# Create directories for object files if directory does not exist
105# Needed when obj-y := dir/file.o syntax is used
106_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
107endif
108
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109ifndef obj
110$(warning kbuild: Makefile.build is included improperly)
111endif
112
113# ===========================================================================
114
115ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),)
116lib-target := $(obj)/lib.a
117endif
118
Jiafu He4b024242009-12-17 18:22:13 -0700119ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(subdir-m) $(lib-target)),)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120builtin-target := $(obj)/built-in.o
121endif
122
Tejun Heo551559e2007-12-07 21:04:30 +0900123modorder-target := $(obj)/modules.order
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125# We keep a list of all modules in $(MODVERDIR)
126
127__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
Tejun Heo551559e2007-12-07 21:04:30 +0900128 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 $(subdir-ym) $(always)
130 @:
131
132# Linus' kernel sanity checking tool
133ifneq ($(KBUILD_CHECKSRC),0)
134 ifeq ($(KBUILD_CHECKSRC),2)
135 quiet_cmd_force_checksrc = CHECK $<
136 cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
137 else
138 quiet_cmd_checksrc = CHECK $<
139 cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
140 endif
141endif
142
Sam Ravnborg91341d42008-01-21 21:31:44 +0100143# Do section mismatch analysis for each module/built-in.o
144ifdef CONFIG_DEBUG_SECTION_MISMATCH
145 cmd_secanalysis = ; scripts/mod/modpost $@
146endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
148# Compile C sources (.c)
149# ---------------------------------------------------------------------------
150
151# Default is built-in, unless we know otherwise
Sam Ravnborg65881692010-07-28 17:33:09 +0200152modkern_cflags = \
153 $(if $(part-of-module), \
154 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200155 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156quiet_modtag := $(empty) $(empty)
157
Shaohua Li18c167f2009-01-12 10:00:51 +0800158$(real-objs-m) : part-of-module := y
159$(real-objs-m:.o=.i) : part-of-module := y
160$(real-objs-m:.o=.s) : part-of-module := y
161$(real-objs-m:.o=.lst): part-of-module := y
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162
163$(real-objs-m) : quiet_modtag := [M]
164$(real-objs-m:.o=.i) : quiet_modtag := [M]
165$(real-objs-m:.o=.s) : quiet_modtag := [M]
166$(real-objs-m:.o=.lst): quiet_modtag := [M]
167
168$(obj-m) : quiet_modtag := [M]
169
170# Default for not multi-part modules
Sam Ravnborg5e8d7802006-07-01 09:58:02 +0200171modname = $(basetarget)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173$(multi-objs-m) : modname = $(modname-multi)
174$(multi-objs-m:.o=.i) : modname = $(modname-multi)
175$(multi-objs-m:.o=.s) : modname = $(modname-multi)
176$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
177$(multi-objs-y) : modname = $(modname-multi)
178$(multi-objs-y:.o=.i) : modname = $(modname-multi)
179$(multi-objs-y:.o=.s) : modname = $(modname-multi)
180$(multi-objs-y:.o=.lst) : modname = $(modname-multi)
181
182quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
Chuck Ebbert7d185982006-03-07 23:58:33 -0800183cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Sam Ravnborg767e5812007-05-06 09:23:45 +0200185$(obj)/%.s: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 $(call if_changed_dep,cc_s_c)
187
188quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
189cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $<
190
Sam Ravnborg767e5812007-05-06 09:23:45 +0200191$(obj)/%.i: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 $(call if_changed_dep,cc_i_c)
193
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100194cmd_gensymtypes = \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100195 $(CPP) -D__GENKSYMS__ $(c_flags) $< | \
Don Zickuse26d6b82010-05-24 17:07:24 -0400196 $(GENKSYMS) $(if $(1), -T $(2)) -a $(ARCH) \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100197 $(if $(KBUILD_PRESERVE),-p) \
Don Zickuse26d6b82010-05-24 17:07:24 -0400198 -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100199
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200200quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100201cmd_cc_symtypes_c = \
202 set -e; \
Don Zickuse26d6b82010-05-24 17:07:24 -0400203 $(call cmd_gensymtypes,true,$@) >/dev/null; \
Sam Ravnborg37a8d9f2008-12-19 21:38:09 +0100204 test -s $@ || rm -f $@
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200205
Sam Ravnborg767e5812007-05-06 09:23:45 +0200206$(obj)/%.symtypes : $(src)/%.c FORCE
Andreas Gruenbacher64e6c1e2008-12-01 14:21:01 -0800207 $(call cmd,cc_symtypes_c)
Andreas Gruenbacher15fde672006-05-09 20:37:30 +0200208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209# C (.c) files
210# The C file is compiled and updated dependency information is generated.
211# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
212
213quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
214
215ifndef CONFIG_MODVERSIONS
216cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<
217
218else
219# When module versioning is enabled the following steps are executed:
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100220# o compile a .tmp_<file>.o from <file>.c
221# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does
222# not export symbols, we just rename .tmp_<file>.o to <file>.o and
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223# are done.
224# o otherwise, we calculate symbol versions using the good old
225# genksyms on the preprocessed source and postprocess them in a way
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100226# that they are usable as a linker script
227# o generate <file>.o from .tmp_<file>.o using the linker to
228# replace the unresolved symbols __crc_exported_symbol with
229# the actual value of the checksum generated by genksyms
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100231cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
Don Zickuse26d6b82010-05-24 17:07:24 -0400232cmd_modversions = \
233 if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then \
234 $(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
235 > $(@D)/.tmp_$(@F:.o=.ver); \
236 \
237 $(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) \
238 -T $(@D)/.tmp_$(@F:.o=.ver); \
239 rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver); \
240 else \
241 mv -f $(@D)/.tmp_$(@F) $@; \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 fi;
243endif
244
Steven Rostedt8da38212008-08-14 15:45:07 -0400245ifdef CONFIG_FTRACE_MCOUNT_RECORD
Steven Rostedt72441cb2010-10-13 17:12:30 -0400246ifdef BUILD_C_RECORDMCOUNT
Steven Rostedt85356f82011-04-12 18:59:10 -0400247ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
248 RECORDMCOUNT_FLAGS = -w
249endif
Steven Rostedtd7b4d6d2010-10-18 14:42:00 -0400250# Due to recursion, we must skip empty.o.
251# The empty.o file is created in the make process in order to determine
252# the target endianness and word size. It is made before all other C
253# files, including recordmcount.
Wu Zhangjin45677452010-10-28 00:24:34 +0800254sub_cmd_record_mcount = \
255 if [ $(@) != "scripts/mod/empty.o" ]; then \
Steven Rostedt85356f82011-04-12 18:59:10 -0400256 $(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
Wu Zhangjin45677452010-10-28 00:24:34 +0800257 fi;
Michal Marekd6971822011-05-17 15:36:46 +0200258recordmcount_source := $(srctree)/scripts/recordmcount.c \
259 $(srctree)/scripts/recordmcount.h
Steven Rostedt72441cb2010-10-13 17:12:30 -0400260else
Wu Zhangjin45677452010-10-28 00:24:34 +0800261sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
Wu Zhangjine6299d22009-11-20 20:34:31 +0800262 "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
Steven Rostedtb3acf292008-10-29 15:30:26 -0400263 "$(if $(CONFIG_64BIT),64,32)" \
Rabin Vincentf9810a82010-08-10 19:39:20 +0100264 "$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
265 "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
Shaohua Li18c167f2009-01-12 10:00:51 +0800266 "$(if $(part-of-module),1,0)" "$(@)";
Michal Marekd6971822011-05-17 15:36:46 +0200267recordmcount_source := $(srctree)/scripts/recordmcount.pl
Steven Rostedt8da38212008-08-14 15:45:07 -0400268endif
Wu Zhangjin45677452010-10-28 00:24:34 +0800269cmd_record_mcount = \
270 if [ "$(findstring -pg,$(_c_flags))" = "-pg" ]; then \
271 $(sub_cmd_record_mcount) \
272 fi;
Steven Rostedt72441cb2010-10-13 17:12:30 -0400273endif
Steven Rostedt8da38212008-08-14 15:45:07 -0400274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275define rule_cc_o_c
Jan Beulich6176aa92006-01-30 10:04:27 +0100276 $(call echo-cmd,checksrc) $(cmd_checksrc) \
277 $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 $(cmd_modversions) \
Andi Kleenc3c63b62009-09-18 12:49:36 -0700279 $(call echo-cmd,record_mcount) \
Steven Rostedt8da38212008-08-14 15:45:07 -0400280 $(cmd_record_mcount) \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200281 scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \
282 $(dot-target).tmp; \
Sam Ravnborg2ea03892009-01-14 21:38:20 +0100283 rm -f $(depfile); \
Sam Ravnborg48f1f052006-07-23 19:37:44 +0200284 mv -f $(dot-target).tmp $(dot-target).cmd
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285endef
286
287# Built-in and composite module parts
Michal Marekd6971822011-05-17 15:36:46 +0200288$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 $(call cmd,force_checksrc)
290 $(call if_changed_rule,cc_o_c)
291
292# Single-part modules are special since we need to mark them in $(MODVERDIR)
293
Michal Marekd6971822011-05-17 15:36:46 +0200294$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 $(call cmd,force_checksrc)
296 $(call if_changed_rule,cc_o_c)
297 @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
298
299quiet_cmd_cc_lst_c = MKLST $@
300 cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
301 $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
302 System.map $(OBJDUMP) > $@
303
Sam Ravnborg767e5812007-05-06 09:23:45 +0200304$(obj)/%.lst: $(src)/%.c FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 $(call if_changed_dep,cc_lst_c)
306
307# Compile assembler sources (.S)
308# ---------------------------------------------------------------------------
309
Sam Ravnborg80c00ba2010-07-28 19:11:27 +0200310modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
Sam Ravnborg65881692010-07-28 17:33:09 +0200312$(real-objs-m) : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
313$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
316cmd_as_s_S = $(CPP) $(a_flags) -o $@ $<
317
Sam Ravnborg767e5812007-05-06 09:23:45 +0200318$(obj)/%.s: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 $(call if_changed_dep,as_s_S)
320
321quiet_cmd_as_o_S = AS $(quiet_modtag) $@
322cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $<
323
Sam Ravnborg767e5812007-05-06 09:23:45 +0200324$(obj)/%.o: $(src)/%.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 $(call if_changed_dep,as_o_S)
326
327targets += $(real-objs-y) $(real-objs-m) $(lib-y)
328targets += $(extra-y) $(MAKECMDGOALS) $(always)
329
330# Linker scripts preprocessor (.lds.S -> .lds)
331# ---------------------------------------------------------------------------
332quiet_cmd_cpp_lds_S = LDS $@
Sam Ravnborg51b563f2009-09-20 12:28:22 +0200333 cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
Tim Abbott42f29a22009-09-20 18:14:12 -0400334 -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Sam Ravnborg767e5812007-05-06 09:23:45 +0200336$(obj)/%.lds: $(src)/%.lds.S FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 $(call if_changed_dep,cpp_lds_S)
338
339# Build the compiled-in targets
340# ---------------------------------------------------------------------------
341
342# To build objects in subdirs, we need to descend into the directories
343$(sort $(subdir-obj-y)): $(subdir-ym) ;
344
345#
346# Rule to compile a set of .o files into one .o file
347#
348ifdef builtin-target
349quiet_cmd_link_o_target = LD $@
350# If the list of objects to link is empty, just create an empty built-in.o
351cmd_link_o_target = $(if $(strip $(obj-y)),\
Sam Ravnborg91341d42008-01-21 21:31:44 +0100352 $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
353 $(cmd_secanalysis),\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 rm -f $@; $(AR) rcs $@)
355
356$(builtin-target): $(obj-y) FORCE
357 $(call if_changed,link_o_target)
358
359targets += $(builtin-target)
360endif # builtin-target
361
362#
Tejun Heo551559e2007-12-07 21:04:30 +0900363# Rule to create modules.order file
364#
365# Create commands to either record .ko file or cat modules.order from
366# a subdirectory
367modorder-cmds = \
368 $(foreach m, $(modorder), \
369 $(if $(filter %/modules.order, $m), \
370 cat $m;, echo kernel/$m;))
371
372$(modorder-target): $(subdir-ym) FORCE
373 $(Q)(cat /dev/null; $(modorder-cmds)) > $@
374
375#
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376# Rule to compile a set of .o files into one .a file
377#
378ifdef lib-target
379quiet_cmd_link_l_target = AR $@
Sam Ravnborg5e54d5e2007-09-30 20:14:58 +0200380cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382$(lib-target): $(lib-y) FORCE
383 $(call if_changed,link_l_target)
384
385targets += $(lib-target)
386endif
387
388#
389# Rule to link composite objects
390#
391# Composite objects are specified in kbuild makefile as follows:
392# <composite-object>-objs := <list of .o files>
393# or
394# <composite-object>-y := <list of .o files>
395link_multi_deps = \
396$(filter $(addprefix $(obj)/, \
397$($(subst $(obj)/,,$(@:.o=-objs))) \
398$($(subst $(obj)/,,$(@:.o=-y)))), $^)
399
400quiet_cmd_link_multi-y = LD $@
Sam Ravnborg91341d42008-01-21 21:31:44 +0100401cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403quiet_cmd_link_multi-m = LD [M] $@
Roland McGrath114f5152007-07-23 01:12:08 -0700404cmd_link_multi-m = $(cmd_link_multi-y)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406# We would rather have a list of rules like
407# foo.o: $(foo-objs)
408# but that's not so easy, so we rather make all composite objects depend
409# on the set of all their parts
410$(multi-used-y) : %.o: $(multi-objs-y) FORCE
411 $(call if_changed,link_multi-y)
412
413$(multi-used-m) : %.o: $(multi-objs-m) FORCE
414 $(call if_changed,link_multi-m)
415 @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
416
417targets += $(multi-used-y) $(multi-used-m)
418
419
420# Descending
421# ---------------------------------------------------------------------------
422
Paul Smith4f193362006-03-05 17:14:10 -0500423PHONY += $(subdir-ym)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424$(subdir-ym):
425 $(Q)$(MAKE) $(build)=$@
426
427# Add FORCE to the prequisites of a target to force it to be always rebuilt.
428# ---------------------------------------------------------------------------
429
Paul Smith4f193362006-03-05 17:14:10 -0500430PHONY += FORCE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431
432FORCE:
433
434# Read all saved command lines and dependencies for the $(targets) we
435# may be building above, using $(if_changed{,_dep}). As an
436# optimization, we don't need to read them if the target does not
437# exist, we will rebuild anyway in that case.
438
439targets := $(wildcard $(sort $(targets)))
440cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
441
442ifneq ($(cmd_files),)
443 include $(cmd_files)
444endif
Paul Smith4f193362006-03-05 17:14:10 -0500445
Paul Smith4f193362006-03-05 17:14:10 -0500446# Declare the contents of the .PHONY variable as phony. We keep that
447# information in a variable se we can use it in if_changed and friends.
448
449.PHONY: $(PHONY)