akaros/scripts/Makefile.build
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   1# ==========================================================================
   2# Building
   3# ==========================================================================
   4
   5src := $(obj)
   6
   7PHONY := __build
   8__build:
   9
  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
  13obj-y :=
  14obj-m :=
  15lib-y :=
  16lib-m :=
  17always :=
  18targets :=
  19subdir-y :=
  20subdir-m :=
  21EXTRA_AFLAGS   :=
  22EXTRA_CFLAGS   :=
  23EXTRA_CPPFLAGS :=
  24EXTRA_LDFLAGS  :=
  25asflags-y  :=
  26ccflags-y  :=
  27cppflags-y :=
  28ldflags-y  :=
  29
  30subdir-asflags-y :=
  31subdir-ccflags-y :=
  32
  33# Read auto.conf if it exists, otherwise ignore
  34-include include/config/auto.conf
  35
  36include scripts/Kbuild.include
  37
  38# For backward compatibility check that these variables do not change
  39save-cflags := $(CFLAGS)
  40
  41# The filename Kbuild has precedence over Makefile
  42kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
  43kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
  44include $(kbuild-file)
  45
  46# If the save-* variables changed error out
  47ifeq ($(KBUILD_NOPEDANTIC),)
  48        ifneq ("$(save-cflags)","$(CFLAGS)")
  49                $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use EXTRA_CFLAGS)
  50        endif
  51endif
  52include 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 += $(host-progs)
  58endif
  59endif
  60
  61# Do not include host rules unless needed
  62ifneq ($(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 $(d)))
  73endif
  74
  75ifndef obj
  76$(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
  89modorder-target := $(obj)/modules.order
  90
  91# We keep a list of all modules in $(MODVERDIR)
  92
  93__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
  94         $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
  95         $(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
 109# Do section mismatch analysis for each module/built-in.o
 110ifdef CONFIG_DEBUG_SECTION_MISMATCH
 111  cmd_secanalysis = ; scripts/mod/modpost $@
 112endif
 113
 114# Compile C sources (.c)
 115# ---------------------------------------------------------------------------
 116
 117# Default is built-in, unless we know otherwise
 118modkern_cflags = $(if $(part-of-module), $(CFLAGS_MODULE), $(CFLAGS_KERNEL))
 119quiet_modtag := $(empty)   $(empty)
 120
 121$(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$(real-objs-m:.o=.lst): part-of-module := y
 125
 126$(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
 134modname = $(basetarget)
 135
 136$(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)  $@
 146cmd_cc_s_c       = $(CC) $(c_flags) -fverbose-asm -S -o $@ $<
 147
 148$(obj)/%.s: $(src)/%.c FORCE
 149        $(call if_changed_dep,cc_s_c)
 150
 151quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
 152cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<
 153
 154$(obj)/%.i: $(src)/%.c FORCE
 155        $(call if_changed_dep,cc_i_c)
 156
 157cmd_gensymtypes =                                                           \
 158    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
 159    $(GENKSYMS) -T $@ -a $(ARCH)                                            \
 160     $(if $(KBUILD_PRESERVE),-p)                                            \
 161     $(if $(1),-r $(firstword $(wildcard $(@:.symtypes=.symref) /dev/null)))
 162
 163quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
 164cmd_cc_symtypes_c =                                                         \
 165    set -e;                                                                 \
 166    $(call cmd_gensymtypes, true) >/dev/null;                               \
 167    test -s $@ || rm -f $@
 168
 169$(obj)/%.symtypes : $(src)/%.c FORCE
 170        $(call cmd,cc_symtypes_c)
 171
 172# 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:
 183# 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
 186#   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
 189#   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
 193
 194cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
 195cmd_modversions =                                                       \
 196        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);        \
 203        else                                                            \
 204                mv -f $(@D)/.tmp_$(@F) $@;                              \
 205        fi;
 206endif
 207
 208ifdef CONFIG_FTRACE_MCOUNT_RECORD
 209cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
 210        "$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
 211        "$(if $(CONFIG_64BIT),64,32)" \
 212        "$(OBJDUMP)" "$(OBJCOPY)" "$(CC)" "$(LD)" "$(NM)" "$(RM)" "$(MV)" \
 213        "$(if $(part-of-module),1,0)" "$(@)";
 214endif
 215
 216define rule_cc_o_c
 217        $(call echo-cmd,checksrc) $(cmd_checksrc)                         \
 218        $(call echo-cmd,cc_o_c) $(cmd_cc_o_c);                            \
 219        $(cmd_modversions)                                                \
 220        $(call echo-cmd,record_mcount)                                    \
 221        $(cmd_record_mcount)                                              \
 222        scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
 223                                                      $(dot-target).tmp;  \
 224        rm -f $(depfile);                                                 \
 225        mv -f $(dot-target).tmp $(dot-target).cmd
 226endef
 227
 228# Built-in and composite module parts
 229$(obj)/%.o: $(src)/%.c FORCE
 230        $(call cmd,force_checksrc)
 231        $(call if_changed_rule,cc_o_c)
 232
 233# Single-part modules are special since we need to mark them in $(MODVERDIR)
 234
 235$(single-used-m): $(obj)/%.o: $(src)/%.c FORCE
 236        $(call cmd,force_checksrc)
 237        $(call if_changed_rule,cc_o_c)
 238        @{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)
 239
 240quiet_cmd_cc_lst_c = MKLST   $@
 241      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
 242                     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
 243                                     System.map $(OBJDUMP) > $@
 244
 245$(obj)/%.lst: $(src)/%.c FORCE
 246        $(call if_changed_dep,cc_lst_c)
 247
 248# Compile assembler sources (.S)
 249# ---------------------------------------------------------------------------
 250
 251modkern_aflags := $(AFLAGS_KERNEL)
 252
 253$(real-objs-m)      : modkern_aflags := $(AFLAGS_MODULE)
 254$(real-objs-m:.o=.s): modkern_aflags := $(AFLAGS_MODULE)
 255
 256quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
 257cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $< 
 258
 259$(obj)/%.s: $(src)/%.S FORCE
 260        $(call if_changed_dep,as_s_S)
 261
 262quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
 263cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<
 264
 265$(obj)/%.o: $(src)/%.S FORCE
 266        $(call if_changed_dep,as_o_S)
 267
 268targets += $(real-objs-y) $(real-objs-m) $(lib-y)
 269targets += $(extra-y) $(MAKECMDGOALS) $(always)
 270
 271# Linker scripts preprocessor (.lds.S -> .lds)
 272# ---------------------------------------------------------------------------
 273quiet_cmd_cpp_lds_S = LDS     $@
 274      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
 275                             -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
 276
 277$(obj)/%.lds: $(src)/%.lds.S FORCE
 278        $(call if_changed_dep,cpp_lds_S)
 279
 280# Build the compiled-in targets
 281# ---------------------------------------------------------------------------
 282
 283# To build objects in subdirs, we need to descend into the directories
 284$(sort $(subdir-obj-y)): $(subdir-ym) ;
 285
 286#
 287# Rule to compile a set of .o files into one .o file
 288#
 289ifdef builtin-target
 290quiet_cmd_link_o_target = LD      $@
 291# If the list of objects to link is empty, just create an empty built-in.o
 292cmd_link_o_target = $(if $(strip $(obj-y)),\
 293                      $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
 294                      $(cmd_secanalysis),\
 295                      rm -f $@; $(AR) rcs $@)
 296
 297$(builtin-target): $(obj-y) FORCE
 298        $(call if_changed,link_o_target)
 299
 300targets += $(builtin-target)
 301endif # builtin-target
 302
 303#
 304# Rule to create modules.order file
 305#
 306# Create commands to either record .ko file or cat modules.order from
 307# a subdirectory
 308modorder-cmds =                                         \
 309        $(foreach m, $(modorder),                       \
 310                $(if $(filter %/modules.order, $m),     \
 311                        cat $m;, echo kernel/$m;))
 312
 313$(modorder-target): $(subdir-ym) FORCE
 314        $(Q)(cat /dev/null; $(modorder-cmds)) > $@
 315
 316#
 317# Rule to compile a set of .o files into one .a file
 318#
 319ifdef lib-target
 320quiet_cmd_link_l_target = AR      $@
 321cmd_link_l_target = rm -f $@; $(AR) rcs $@ $(lib-y)
 322
 323$(lib-target): $(lib-y) FORCE
 324        $(call if_changed,link_l_target)
 325
 326targets += $(lib-target)
 327endif
 328
 329#
 330# Rule to link composite objects
 331#
 332#  Composite objects are specified in kbuild makefile as follows:
 333#    <composite-object>-objs := <list of .o files>
 334#  or
 335#    <composite-object>-y    := <list of .o files>
 336link_multi_deps =                     \
 337$(filter $(addprefix $(obj)/,         \
 338$($(subst $(obj)/,,$(@:.o=-objs)))    \
 339$($(subst $(obj)/,,$(@:.o=-y)))), $^)
 340 
 341quiet_cmd_link_multi-y = LD      $@
 342cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)
 343
 344quiet_cmd_link_multi-m = LD [M]  $@
 345cmd_link_multi-m = $(cmd_link_multi-y)
 346
 347# We would rather have a list of rules like
 348#       foo.o: $(foo-objs)
 349# but that's not so easy, so we rather make all composite objects depend
 350# on the set of all their parts
 351$(multi-used-y) : %.o: $(multi-objs-y) FORCE
 352        $(call if_changed,link_multi-y)
 353
 354$(multi-used-m) : %.o: $(multi-objs-m) FORCE
 355        $(call if_changed,link_multi-m)
 356        @{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
 357
 358targets += $(multi-used-y) $(multi-used-m)
 359
 360
 361# Descending
 362# ---------------------------------------------------------------------------
 363
 364PHONY += $(subdir-ym)
 365$(subdir-ym):
 366        $(Q)$(MAKE) $(build)=$@
 367
 368# Add FORCE to the prequisites of a target to force it to be always rebuilt.
 369# ---------------------------------------------------------------------------
 370
 371PHONY += FORCE
 372
 373FORCE:
 374
 375# Read all saved command lines and dependencies for the $(targets) we
 376# may be building above, using $(if_changed{,_dep}). As an
 377# optimization, we don't need to read them if the target does not
 378# exist, we will rebuild anyway in that case.
 379
 380targets := $(wildcard $(sort $(targets)))
 381cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))
 382
 383ifneq ($(cmd_files),)
 384  include $(cmd_files)
 385endif
 386
 387
 388# Declare the contents of the .PHONY variable as phony.  We keep that
 389# information in a variable se we can use it in if_changed and friends.
 390
 391.PHONY: $(PHONY)
 392