linux/scripts/Makefile.lib
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   1# Backward compatibility
   2asflags-y  += $(EXTRA_AFLAGS)
   3ccflags-y  += $(EXTRA_CFLAGS)
   4cppflags-y += $(EXTRA_CPPFLAGS)
   5ldflags-y  += $(EXTRA_LDFLAGS)
   6
   7#
   8# flags that take effect in sub directories
   9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
  10export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
  11
  12# Figure out what we need to build from the various variables
  13# ===========================================================================
  14
  15# When an object is listed to be built compiled-in and modular,
  16# only build the compiled-in version
  17
  18obj-m := $(filter-out $(obj-y),$(obj-m))
  19
  20# Libraries are always collected in one lib file.
  21# Filter out objects already built-in
  22
  23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  24
  25
  26# Handle objects in subdirs
  27# ---------------------------------------------------------------------------
  28# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
  29#   and add the directory to the list of dirs to descend into: $(subdir-y)
  30# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 
  31#   and add the directory to the list of dirs to descend into: $(subdir-m)
  32
  33# Determine modorder.
  34# Unfortunately, we don't have information about ordering between -y
  35# and -m subdirs.  Just put -y's first.
  36modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  37
  38__subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  39subdir-y        += $(__subdir-y)
  40__subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  41subdir-m        += $(__subdir-m)
  42obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
  43obj-m           := $(filter-out %/, $(obj-m))
  44
  45# Subdirectories we need to descend into
  46
  47subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  48
  49# if $(foo-objs) exists, foo.o is a composite object 
  50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  52multi-used   := $(multi-used-y) $(multi-used-m)
  53single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
  54
  55# Build list of the parts of our composite objects, our composite
  56# objects depend on those (obviously)
  57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
  58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
  59multi-objs   := $(multi-objs-y) $(multi-objs-m)
  60
  61# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
  62# tell kbuild to descend
  63subdir-obj-y := $(filter %/built-in.o, $(obj-y))
  64
  65# $(obj-dirs) is a list of directories that contain object files
  66obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
  67
  68# Replace multi-part objects by their individual parts, look at local dir only
  69real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) $(extra-y)
  70real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
  71
  72# Add subdir path
  73
  74extra-y         := $(addprefix $(obj)/,$(extra-y))
  75always          := $(addprefix $(obj)/,$(always))
  76targets         := $(addprefix $(obj)/,$(targets))
  77modorder        := $(addprefix $(obj)/,$(modorder))
  78obj-y           := $(addprefix $(obj)/,$(obj-y))
  79obj-m           := $(addprefix $(obj)/,$(obj-m))
  80lib-y           := $(addprefix $(obj)/,$(lib-y))
  81subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  82real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  83real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  84single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  85multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  86multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  87multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  88multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  89subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  90obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
  91
  92# These flags are needed for modversions and compiling, so we define them here
  93# already
  94# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 
  95# end up in (or would, if it gets compiled in)
  96# Note: It's possible that one object gets potentially linked into more
  97#       than one module. In that case KBUILD_MODNAME will be set to foo_bar,
  98#       where foo and bar are the name of the modules.
  99name-fix = $(subst $(comma),_,$(subst -,_,$1))
 100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
 101modname_flags  = $(if $(filter 1,$(words $(modname))),\
 102                 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
 103
 104orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
 105                 $(ccflags-y) $(CFLAGS_$(basetarget).o)
 106_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 107_a_flags       = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
 108                 $(asflags-y) $(AFLAGS_$(basetarget).o)
 109_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 110
 111#
 112# Enable gcov profiling flags for a file, directory or for all files depending
 113# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 114# (in this order)
 115#
 116ifeq ($(CONFIG_GCOV_KERNEL),y)
 117_c_flags += $(if $(patsubst n%,, \
 118                $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 119                $(CFLAGS_GCOV))
 120endif
 121
 122ifdef CONFIG_SYMBOL_PREFIX
 123_sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
 124_cpp_flags += $(_sym_flags)
 125_a_flags += $(_sym_flags)
 126endif
 127
 128
 129# If building the kernel in a separate objtree expand all occurrences
 130# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 131
 132ifeq ($(KBUILD_SRC),)
 133__c_flags       = $(_c_flags)
 134__a_flags       = $(_a_flags)
 135__cpp_flags     = $(_cpp_flags)
 136else
 137
 138# -I$(obj) locates generated .h files
 139# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 140#   and locates generated .h files
 141# FIXME: Replace both with specific CFLAGS* statements in the makefiles
 142__c_flags       = $(call addtree,-I$(obj)) $(call flags,_c_flags)
 143__a_flags       =                          $(call flags,_a_flags)
 144__cpp_flags     =                          $(call flags,_cpp_flags)
 145endif
 146
 147c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 148                 $(__c_flags) $(modkern_cflags)                           \
 149                 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
 150
 151a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 152                 $(__a_flags) $(modkern_aflags)
 153
 154cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 155                 $(__cpp_flags)
 156
 157ld_flags       = $(LDFLAGS) $(ldflags-y)
 158
 159# Finds the multi-part object the current object will be linked into
 160modname-multi = $(sort $(foreach m,$(multi-used),\
 161                $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 162
 163ifdef REGENERATE_PARSERS
 164
 165# GPERF
 166# ---------------------------------------------------------------------------
 167quiet_cmd_gperf = GPERF $@
 168      cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
 169
 170$(src)/%.hash.c_shipped: $(src)/%.gperf
 171        $(call cmd,gperf)
 172
 173# LEX
 174# ---------------------------------------------------------------------------
 175LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
 176
 177quiet_cmd_flex = LEX     $@
 178      cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
 179
 180$(src)/%.lex.c_shipped: $(src)/%.l
 181        $(call cmd,flex)
 182
 183# YACC
 184# ---------------------------------------------------------------------------
 185YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
 186
 187quiet_cmd_bison = YACC    $@
 188      cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
 189
 190$(src)/%.tab.c_shipped: $(src)/%.y
 191        $(call cmd,bison)
 192
 193quiet_cmd_bison_h = YACC    $@
 194      cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
 195
 196$(src)/%.tab.h_shipped: $(src)/%.y
 197        $(call cmd,bison_h)
 198
 199endif
 200
 201# Shipped files
 202# ===========================================================================
 203
 204quiet_cmd_shipped = SHIPPED $@
 205cmd_shipped = cat $< > $@
 206
 207$(obj)/%: $(src)/%_shipped
 208        $(call cmd,shipped)
 209
 210# Commands useful for building a boot image
 211# ===========================================================================
 212# 
 213#       Use as following:
 214#
 215#       target: source(s) FORCE
 216#               $(if_changed,ld/objcopy/gzip)
 217#
 218#       and add target to extra-y so that we know we have to
 219#       read in the saved command line
 220
 221# Linking
 222# ---------------------------------------------------------------------------
 223
 224quiet_cmd_ld = LD      $@
 225cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 226               $(filter-out FORCE,$^) -o $@ 
 227
 228# Objcopy
 229# ---------------------------------------------------------------------------
 230
 231quiet_cmd_objcopy = OBJCOPY $@
 232cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 233
 234# Gzip
 235# ---------------------------------------------------------------------------
 236
 237quiet_cmd_gzip = GZIP    $@
 238cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
 239        (rm -f $@ ; false)
 240
 241# DTC
 242# ---------------------------------------------------------------------------
 243
 244# Generate an assembly file to wrap the output of the device tree compiler
 245quiet_cmd_dt_S_dtb= DTB    $@
 246cmd_dt_S_dtb=                                           \
 247(                                                       \
 248        echo '\#include <asm-generic/vmlinux.lds.h>';   \
 249        echo '.section .dtb.init.rodata,"a"';           \
 250        echo '.balign STRUCT_ALIGNMENT';                \
 251        echo '.global __dtb_$(*F)_begin';               \
 252        echo '__dtb_$(*F)_begin:';                      \
 253        echo '.incbin "$<" ';                           \
 254        echo '__dtb_$(*F)_end:';                        \
 255        echo '.global __dtb_$(*F)_end';                 \
 256        echo '.balign STRUCT_ALIGNMENT';                \
 257) > $@
 258
 259$(obj)/%.dtb.S: $(obj)/%.dtb
 260        $(call cmd,dt_S_dtb)
 261
 262quiet_cmd_dtc = DTC     $@
 263cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) $<
 264
 265# Bzip2
 266# ---------------------------------------------------------------------------
 267
 268# Bzip2 and LZMA do not include size in file... so we have to fake that;
 269# append the size as a 32-bit littleendian number as gzip does.
 270size_append = printf $(shell                                            \
 271dec_size=0;                                                             \
 272for F in $1; do                                                         \
 273        fsize=$$(stat -c "%s" $$F);                                     \
 274        dec_size=$$(expr $$dec_size + $$fsize);                         \
 275done;                                                                   \
 276printf "%08x\n" $$dec_size |                                            \
 277        sed 's/\(..\)/\1 /g' | {                                        \
 278                read ch0 ch1 ch2 ch3;                                   \
 279                for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 280                        printf '%s%03o' '\\' $$((0x$$ch));              \
 281                done;                                                   \
 282        }                                                               \
 283)
 284
 285quiet_cmd_bzip2 = BZIP2   $@
 286cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 287        bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 288        (rm -f $@ ; false)
 289
 290# Lzma
 291# ---------------------------------------------------------------------------
 292
 293quiet_cmd_lzma = LZMA    $@
 294cmd_lzma = (cat $(filter-out FORCE,$^) | \
 295        lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 296        (rm -f $@ ; false)
 297
 298quiet_cmd_lzo = LZO     $@
 299cmd_lzo = (cat $(filter-out FORCE,$^) | \
 300        lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 301        (rm -f $@ ; false)
 302
 303# XZ
 304# ---------------------------------------------------------------------------
 305# Use xzkern to compress the kernel image and xzmisc to compress other things.
 306#
 307# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
 308# of the kernel decompressor. A BCJ filter is used if it is available for
 309# the target architecture. xzkern also appends uncompressed size of the data
 310# using size_append. The .xz format has the size information available at
 311# the end of the file too, but it's in more complex format and it's good to
 312# avoid changing the part of the boot code that reads the uncompressed size.
 313# Note that the bytes added by size_append will make the xz tool think that
 314# the file is corrupt. This is expected.
 315#
 316# xzmisc doesn't use size_append, so it can be used to create normal .xz
 317# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
 318# big dictionary would increase the memory usage too much in the multi-call
 319# decompression mode. A BCJ filter isn't used either.
 320quiet_cmd_xzkern = XZKERN  $@
 321cmd_xzkern = (cat $(filter-out FORCE,$^) | \
 322        sh $(srctree)/scripts/xz_wrap.sh && \
 323        $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 324        (rm -f $@ ; false)
 325
 326quiet_cmd_xzmisc = XZMISC  $@
 327cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
 328        xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
 329        (rm -f $@ ; false)
 330
 331# misc stuff
 332# ---------------------------------------------------------------------------
 333quote:="
 334
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