Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | # ========================================================================== |
| 2 | # Building |
| 3 | # ========================================================================== |
| 4 | |
| 5 | src := $(obj) |
| 6 | |
Paul Smith | 4f19336 | 2006-03-05 17:14:10 -0500 | [diff] [blame] | 7 | PHONY := __build |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | __build: |
| 9 | |
Sam Ravnborg | d72e5ed | 2007-05-28 22:47:48 +0200 | [diff] [blame] | 10 | # 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 |
| 13 | obj-y := |
| 14 | obj-m := |
| 15 | lib-y := |
| 16 | lib-m := |
| 17 | always := |
| 18 | targets := |
| 19 | subdir-y := |
| 20 | subdir-m := |
| 21 | EXTRA_AFLAGS := |
| 22 | EXTRA_CFLAGS := |
| 23 | EXTRA_CPPFLAGS := |
| 24 | EXTRA_LDFLAGS := |
Sam Ravnborg | f77bf01 | 2007-10-15 22:25:06 +0200 | [diff] [blame] | 25 | asflags-y := |
| 26 | ccflags-y := |
| 27 | cppflags-y := |
| 28 | ldflags-y := |
Sam Ravnborg | d72e5ed | 2007-05-28 22:47:48 +0200 | [diff] [blame] | 29 | |
Robert P. J. Day | 3156fd0 | 2008-02-18 04:48:20 -0500 | [diff] [blame] | 30 | # Read auto.conf if it exists, otherwise ignore |
Roman Zippel | c955cca | 2006-06-08 22:12:39 -0700 | [diff] [blame] | 31 | -include include/config/auto.conf |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Sam Ravnborg | 20a468b | 2006-01-22 13:34:15 +0100 | [diff] [blame] | 33 | include scripts/Kbuild.include |
| 34 | |
Robert P. J. Day | 3156fd0 | 2008-02-18 04:48:20 -0500 | [diff] [blame] | 35 | # For backward compatibility check that these variables do not change |
Sam Ravnborg | 0c53c8e | 2007-10-14 22:26:53 +0200 | [diff] [blame] | 36 | save-cflags := $(CFLAGS) |
| 37 | |
Sam Ravnborg | 2a69147 | 2005-07-25 20:26:04 +0000 | [diff] [blame] | 38 | # The filename Kbuild has precedence over Makefile |
Sam Ravnborg | db8c1a7 | 2005-07-27 22:11:01 +0200 | [diff] [blame] | 39 | kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) |
Sam Ravnborg | 0c53c8e | 2007-10-14 22:26:53 +0200 | [diff] [blame] | 40 | kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile) |
| 41 | include $(kbuild-file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Sam Ravnborg | 0c53c8e | 2007-10-14 22:26:53 +0200 | [diff] [blame] | 43 | # If the save-* variables changed error out |
| 44 | ifeq ($(KBUILD_NOPEDANTIC),) |
| 45 | ifneq ("$(save-cflags)","$(CFLAGS)") |
| 46 | $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS) |
| 47 | endif |
| 48 | endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | include scripts/Makefile.lib |
| 50 | |
| 51 | ifdef host-progs |
| 52 | ifneq ($(hostprogs-y),$(host-progs)) |
| 53 | $(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!) |
| 54 | hostprogs-y += $(host-progs) |
| 55 | endif |
| 56 | endif |
| 57 | |
Robert P. J. Day | 3156fd0 | 2008-02-18 04:48:20 -0500 | [diff] [blame] | 58 | # Do not include host rules unless needed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | ifneq ($(hostprogs-y)$(hostprogs-m),) |
| 60 | include scripts/Makefile.host |
| 61 | endif |
| 62 | |
| 63 | ifneq ($(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))) |
| 70 | endif |
| 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | ifndef obj |
| 73 | $(warning kbuild: Makefile.build is included improperly) |
| 74 | endif |
| 75 | |
| 76 | # =========================================================================== |
| 77 | |
| 78 | ifneq ($(strip $(lib-y) $(lib-m) $(lib-n) $(lib-)),) |
| 79 | lib-target := $(obj)/lib.a |
| 80 | endif |
| 81 | |
| 82 | ifneq ($(strip $(obj-y) $(obj-m) $(obj-n) $(obj-) $(lib-target)),) |
| 83 | builtin-target := $(obj)/built-in.o |
| 84 | endif |
| 85 | |
Tejun Heo | 551559e | 2007-12-07 21:04:30 +0900 | [diff] [blame] | 86 | modorder-target := $(obj)/modules.order |
| 87 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | # We keep a list of all modules in $(MODVERDIR) |
| 89 | |
| 90 | __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \ |
Tejun Heo | 551559e | 2007-12-07 21:04:30 +0900 | [diff] [blame] | 91 | $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | $(subdir-ym) $(always) |
| 93 | @: |
| 94 | |
| 95 | # Linus' kernel sanity checking tool |
| 96 | ifneq ($(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 |
| 104 | endif |
| 105 | |
Sam Ravnborg | 91341d4 | 2008-01-21 21:31:44 +0100 | [diff] [blame] | 106 | # Do section mismatch analysis for each module/built-in.o |
| 107 | ifdef CONFIG_DEBUG_SECTION_MISMATCH |
| 108 | cmd_secanalysis = ; scripts/mod/modpost $@ |
| 109 | endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | # Compile C sources (.c) |
| 112 | # --------------------------------------------------------------------------- |
| 113 | |
| 114 | # Default is built-in, unless we know otherwise |
| 115 | modkern_cflags := $(CFLAGS_KERNEL) |
| 116 | quiet_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 Ravnborg | 5e8d780 | 2006-07-01 09:58:02 +0200 | [diff] [blame] | 131 | modname = $(basetarget) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
| 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 | |
| 142 | quiet_cmd_cc_s_c = CC $(quiet_modtag) $@ |
Chuck Ebbert | 7d18598 | 2006-03-07 23:58:33 -0800 | [diff] [blame] | 143 | cmd_cc_s_c = $(CC) $(c_flags) -fverbose-asm -S -o $@ $< |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 145 | $(obj)/%.s: $(src)/%.c FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | $(call if_changed_dep,cc_s_c) |
| 147 | |
| 148 | quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@ |
| 149 | cmd_cc_i_c = $(CPP) $(c_flags) -o $@ $< |
| 150 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 151 | $(obj)/%.i: $(src)/%.c FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | $(call if_changed_dep,cc_i_c) |
| 153 | |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 154 | cmd_genksyms = \ |
Sam Ravnborg | 37a8d9f | 2008-12-19 21:38:09 +0100 | [diff] [blame] | 155 | $(CPP) -D__GENKSYMS__ $(c_flags) $< | \ |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 156 | $(GENKSYMS) -T $@ -A -a $(ARCH) \ |
Sam Ravnborg | 37a8d9f | 2008-12-19 21:38:09 +0100 | [diff] [blame] | 157 | $(if $(KBUILD_PRESERVE),-p) \ |
| 158 | $(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null))) |
| 159 | |
Andreas Gruenbacher | 15fde67 | 2006-05-09 20:37:30 +0200 | [diff] [blame] | 160 | quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@ |
Sam Ravnborg | 37a8d9f | 2008-12-19 21:38:09 +0100 | [diff] [blame] | 161 | cmd_cc_symtypes_c = \ |
| 162 | set -e; \ |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 163 | $(call cmd_genksyms, true) >/dev/null; \ |
Sam Ravnborg | 37a8d9f | 2008-12-19 21:38:09 +0100 | [diff] [blame] | 164 | test -s $@ || rm -f $@ |
Andreas Gruenbacher | 15fde67 | 2006-05-09 20:37:30 +0200 | [diff] [blame] | 165 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 166 | $(obj)/%.symtypes : $(src)/%.c FORCE |
Andreas Gruenbacher | 64e6c1e | 2008-12-01 14:21:01 -0800 | [diff] [blame] | 167 | $(call cmd,cc_symtypes_c) |
Andreas Gruenbacher | 15fde67 | 2006-05-09 20:37:30 +0200 | [diff] [blame] | 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | # C (.c) files |
| 170 | # The C file is compiled and updated dependency information is generated. |
| 171 | # (See cmd_cc_o_c + relevant part of rule_cc_o_c) |
| 172 | |
| 173 | quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ |
| 174 | |
| 175 | ifndef CONFIG_MODVERSIONS |
| 176 | cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< |
| 177 | |
| 178 | else |
| 179 | # When module versioning is enabled the following steps are executed: |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 180 | # o compile a .tmp_<file>.s from <file>.c |
| 181 | # o if .tmp_<file>.s doesn't contain a __ksymtab version, i.e. does |
| 182 | # not export symbols, we just assemble .tmp_<file>.s to <file>.o and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | # are done. |
| 184 | # o otherwise, we calculate symbol versions using the good old |
| 185 | # genksyms on the preprocessed source and postprocess them in a way |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 186 | # that they are usable as assembly source |
| 187 | # o assemble <file>.o from .tmp_<file>.s forcing inclusion of directives |
| 188 | # defining the actual values of __crc_*, followed by objcopy-ing them |
| 189 | # to force these symbols to be local to permit stripping them later. |
| 190 | s_file = $(@D)/.tmp_$(@F:.o=.s) |
| 191 | v_file = $(@D)/.tmp_$(@F:.o=.v) |
| 192 | tmp_o_file = $(@D)/.tmp_$(@F) |
| 193 | no_g_c_flags = $(filter-out -g%,$(c_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 195 | cmd_cc_o_c = $(CC) $(c_flags) -S -o $(s_file) $< |
| 196 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | cmd_modversions = \ |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 198 | if grep -q __ksymtab $(s_file); then \ |
| 199 | if $(call cmd_genksyms, $(KBUILD_SYMTYPES)) > $(v_file) \ |
| 200 | && $(CC) $(no_g_c_flags) -c -Wa,$(v_file) \ |
| 201 | -o $(tmp_o_file) $(s_file) \ |
| 202 | && $(OBJCOPY) -L '__crc_*' -L '___crc_*' -w \ |
| 203 | $(tmp_o_file) $@; \ |
| 204 | then \ |
| 205 | : ; \ |
| 206 | else \ |
| 207 | rm -f $@; exit 1; \ |
| 208 | fi; \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | else \ |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 210 | rm -f $(v_file); \ |
| 211 | $(CC) $(no_g_c_flags) -c -o $@ $(s_file); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | fi; |
| 213 | endif |
| 214 | |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 215 | ifdef CONFIG_FTRACE_MCOUNT_RECORD |
Steven Rostedt | b3acf29 | 2008-10-29 15:30:26 -0400 | [diff] [blame] | 216 | cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \ |
| 217 | "$(if $(CONFIG_64BIT),64,32)" \ |
| 218 | "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" "$(@)"; |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 219 | endif |
| 220 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | define rule_cc_o_c |
Jan Beulich | 6176aa9 | 2006-01-30 10:04:27 +0100 | [diff] [blame] | 222 | $(call echo-cmd,checksrc) $(cmd_checksrc) \ |
| 223 | $(call echo-cmd,cc_o_c) $(cmd_cc_o_c); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | $(cmd_modversions) \ |
Steven Rostedt | 8da3821 | 2008-08-14 15:45:07 -0400 | [diff] [blame] | 225 | $(cmd_record_mcount) \ |
Sam Ravnborg | 48f1f05 | 2006-07-23 19:37:44 +0200 | [diff] [blame] | 226 | scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' > \ |
| 227 | $(dot-target).tmp; \ |
Jan Beulich | ad7a953 | 2008-12-16 11:28:14 +0000 | [diff] [blame] | 228 | if [ -r $(@D)/.tmp_$(@F:.o=.v) ]; then \ |
| 229 | echo >> $(dot-target).tmp; \ |
| 230 | echo '$@: $(GENKSYMS)' >> $(dot-target).tmp; \ |
| 231 | echo '$(GENKSYMS):: ;' >> $(dot-target).tmp; \ |
| 232 | fi; \ |
| 233 | rm -f $(depfile) $(@D)/.tmp_$(@F:.o=.?); \ |
Sam Ravnborg | 48f1f05 | 2006-07-23 19:37:44 +0200 | [diff] [blame] | 234 | mv -f $(dot-target).tmp $(dot-target).cmd |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | endef |
| 236 | |
| 237 | # Built-in and composite module parts |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 238 | $(obj)/%.o: $(src)/%.c FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | $(call cmd,force_checksrc) |
| 240 | $(call if_changed_rule,cc_o_c) |
| 241 | |
| 242 | # Single-part modules are special since we need to mark them in $(MODVERDIR) |
| 243 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 244 | $(single-used-m): $(obj)/%.o: $(src)/%.c FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | $(call cmd,force_checksrc) |
| 246 | $(call if_changed_rule,cc_o_c) |
| 247 | @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod) |
| 248 | |
| 249 | quiet_cmd_cc_lst_c = MKLST $@ |
| 250 | cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \ |
| 251 | $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \ |
| 252 | System.map $(OBJDUMP) > $@ |
| 253 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 254 | $(obj)/%.lst: $(src)/%.c FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | $(call if_changed_dep,cc_lst_c) |
| 256 | |
| 257 | # Compile assembler sources (.S) |
| 258 | # --------------------------------------------------------------------------- |
| 259 | |
| 260 | modkern_aflags := $(AFLAGS_KERNEL) |
| 261 | |
| 262 | $(real-objs-m) : modkern_aflags := $(AFLAGS_MODULE) |
| 263 | $(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE) |
| 264 | |
| 265 | quiet_cmd_as_s_S = CPP $(quiet_modtag) $@ |
| 266 | cmd_as_s_S = $(CPP) $(a_flags) -o $@ $< |
| 267 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 268 | $(obj)/%.s: $(src)/%.S FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | $(call if_changed_dep,as_s_S) |
| 270 | |
| 271 | quiet_cmd_as_o_S = AS $(quiet_modtag) $@ |
| 272 | cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< |
| 273 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 274 | $(obj)/%.o: $(src)/%.S FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | $(call if_changed_dep,as_o_S) |
| 276 | |
| 277 | targets += $(real-objs-y) $(real-objs-m) $(lib-y) |
| 278 | targets += $(extra-y) $(MAKECMDGOALS) $(always) |
| 279 | |
| 280 | # Linker scripts preprocessor (.lds.S -> .lds) |
| 281 | # --------------------------------------------------------------------------- |
| 282 | quiet_cmd_cpp_lds_S = LDS $@ |
| 283 | cmd_cpp_lds_S = $(CPP) $(cpp_flags) -D__ASSEMBLY__ -o $@ $< |
| 284 | |
Sam Ravnborg | 767e581 | 2007-05-06 09:23:45 +0200 | [diff] [blame] | 285 | $(obj)/%.lds: $(src)/%.lds.S FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | $(call if_changed_dep,cpp_lds_S) |
| 287 | |
| 288 | # Build the compiled-in targets |
| 289 | # --------------------------------------------------------------------------- |
| 290 | |
| 291 | # To build objects in subdirs, we need to descend into the directories |
| 292 | $(sort $(subdir-obj-y)): $(subdir-ym) ; |
| 293 | |
| 294 | # |
| 295 | # Rule to compile a set of .o files into one .o file |
| 296 | # |
| 297 | ifdef builtin-target |
| 298 | quiet_cmd_link_o_target = LD $@ |
| 299 | # If the list of objects to link is empty, just create an empty built-in.o |
| 300 | cmd_link_o_target = $(if $(strip $(obj-y)),\ |
Sam Ravnborg | 91341d4 | 2008-01-21 21:31:44 +0100 | [diff] [blame] | 301 | $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \ |
| 302 | $(cmd_secanalysis),\ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | rm -f $@; $(AR) rcs $@) |
| 304 | |
| 305 | $(builtin-target): $(obj-y) FORCE |
| 306 | $(call if_changed,link_o_target) |
| 307 | |
| 308 | targets += $(builtin-target) |
| 309 | endif # builtin-target |
| 310 | |
| 311 | # |
Tejun Heo | 551559e | 2007-12-07 21:04:30 +0900 | [diff] [blame] | 312 | # Rule to create modules.order file |
| 313 | # |
| 314 | # Create commands to either record .ko file or cat modules.order from |
| 315 | # a subdirectory |
| 316 | modorder-cmds = \ |
| 317 | $(foreach m, $(modorder), \ |
| 318 | $(if $(filter %/modules.order, $m), \ |
| 319 | cat $m;, echo kernel/$m;)) |
| 320 | |
| 321 | $(modorder-target): $(subdir-ym) FORCE |
| 322 | $(Q)(cat /dev/null; $(modorder-cmds)) > $@ |
| 323 | |
| 324 | # |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | # Rule to compile a set of .o files into one .a file |
| 326 | # |
| 327 | ifdef lib-target |
| 328 | quiet_cmd_link_l_target = AR $@ |
Sam Ravnborg | 5e54d5e | 2007-09-30 20:14:58 +0200 | [diff] [blame] | 329 | cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | |
| 331 | $(lib-target): $(lib-y) FORCE |
| 332 | $(call if_changed,link_l_target) |
| 333 | |
| 334 | targets += $(lib-target) |
| 335 | endif |
| 336 | |
| 337 | # |
| 338 | # Rule to link composite objects |
| 339 | # |
| 340 | # Composite objects are specified in kbuild makefile as follows: |
| 341 | # <composite-object>-objs := <list of .o files> |
| 342 | # or |
| 343 | # <composite-object>-y := <list of .o files> |
| 344 | link_multi_deps = \ |
| 345 | $(filter $(addprefix $(obj)/, \ |
| 346 | $($(subst $(obj)/,,$(@:.o=-objs))) \ |
| 347 | $($(subst $(obj)/,,$(@:.o=-y)))), $^) |
| 348 | |
| 349 | quiet_cmd_link_multi-y = LD $@ |
Sam Ravnborg | 91341d4 | 2008-01-21 21:31:44 +0100 | [diff] [blame] | 350 | cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | |
| 352 | quiet_cmd_link_multi-m = LD [M] $@ |
Roland McGrath | 114f515 | 2007-07-23 01:12:08 -0700 | [diff] [blame] | 353 | cmd_link_multi-m = $(cmd_link_multi-y) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
| 355 | # We would rather have a list of rules like |
| 356 | # foo.o: $(foo-objs) |
| 357 | # but that's not so easy, so we rather make all composite objects depend |
| 358 | # on the set of all their parts |
| 359 | $(multi-used-y) : %.o: $(multi-objs-y) FORCE |
| 360 | $(call if_changed,link_multi-y) |
| 361 | |
| 362 | $(multi-used-m) : %.o: $(multi-objs-m) FORCE |
| 363 | $(call if_changed,link_multi-m) |
| 364 | @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod) |
| 365 | |
| 366 | targets += $(multi-used-y) $(multi-used-m) |
| 367 | |
| 368 | |
| 369 | # Descending |
| 370 | # --------------------------------------------------------------------------- |
| 371 | |
Paul Smith | 4f19336 | 2006-03-05 17:14:10 -0500 | [diff] [blame] | 372 | PHONY += $(subdir-ym) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | $(subdir-ym): |
| 374 | $(Q)$(MAKE) $(build)=$@ |
| 375 | |
| 376 | # Add FORCE to the prequisites of a target to force it to be always rebuilt. |
| 377 | # --------------------------------------------------------------------------- |
| 378 | |
Paul Smith | 4f19336 | 2006-03-05 17:14:10 -0500 | [diff] [blame] | 379 | PHONY += FORCE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | |
| 381 | FORCE: |
| 382 | |
| 383 | # Read all saved command lines and dependencies for the $(targets) we |
| 384 | # may be building above, using $(if_changed{,_dep}). As an |
| 385 | # optimization, we don't need to read them if the target does not |
| 386 | # exist, we will rebuild anyway in that case. |
| 387 | |
| 388 | targets := $(wildcard $(sort $(targets))) |
| 389 | cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) |
| 390 | |
| 391 | ifneq ($(cmd_files),) |
| 392 | include $(cmd_files) |
| 393 | endif |
Paul Smith | 4f19336 | 2006-03-05 17:14:10 -0500 | [diff] [blame] | 394 | |
| 395 | |
| 396 | # Declare the contents of the .PHONY variable as phony. We keep that |
| 397 | # information in a variable se we can use it in if_changed and friends. |
| 398 | |
| 399 | .PHONY: $(PHONY) |