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# Figure out what we need to build from the various variables
   8# ===========================================================================
   9
  10# When an object is listed to be built compiled-in and modular,
  11# only build the compiled-in version
  12
  13obj-m := $(filter-out $(obj-y),$(obj-m))
  14
  15# Libraries are always collected in one lib file.
  16# Filter out objects already built-in
  17
  18lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
  19
  20
  21# Handle objects in subdirs
  22# ---------------------------------------------------------------------------
  23# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
  24#   and add the directory to the list of dirs to descend into: $(subdir-y)
  25# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 
  26#   and add the directory to the list of dirs to descend into: $(subdir-m)
  27
  28# Determine modorder.
  29# Unfortunately, we don't have information about ordering between -y
  30# and -m subdirs.  Just put -y's first.
  31modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  32
  33__subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  34subdir-y        += $(__subdir-y)
  35__subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  36subdir-m        += $(__subdir-m)
  37obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
  38obj-m           := $(filter-out %/, $(obj-m))
  39
  40# Subdirectories we need to descend into
  41
  42subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  43
  44# if $(foo-objs) exists, foo.o is a composite object 
  45multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  46multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  47multi-used   := $(multi-used-y) $(multi-used-m)
  48single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
  49
  50# Build list of the parts of our composite objects, our composite
  51# objects depend on those (obviously)
  52multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
  53multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
  54multi-objs   := $(multi-objs-y) $(multi-objs-m)
  55
  56# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
  57# tell kbuild to descend
  58subdir-obj-y := $(filter %/built-in.o, $(obj-y))
  59
  60# $(obj-dirs) is a list of directories that contain object files
  61obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
  62
  63# Replace multi-part objects by their individual parts, look at local dir only
  64real-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)
  65real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
  66
  67# Add subdir path
  68
  69extra-y         := $(addprefix $(obj)/,$(extra-y))
  70always          := $(addprefix $(obj)/,$(always))
  71targets         := $(addprefix $(obj)/,$(targets))
  72modorder        := $(addprefix $(obj)/,$(modorder))
  73obj-y           := $(addprefix $(obj)/,$(obj-y))
  74obj-m           := $(addprefix $(obj)/,$(obj-m))
  75lib-y           := $(addprefix $(obj)/,$(lib-y))
  76subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  77real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  78real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  79single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  80multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  81multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  82multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  83multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  84subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  85obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
  86
  87# These flags are needed for modversions and compiling, so we define them here
  88# already
  89# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 
  90# end up in (or would, if it gets compiled in)
  91# Note: It's possible that one object gets potentially linked into more
  92#       than one module. In that case KBUILD_MODNAME will be set to foo_bar,
  93#       where foo and bar are the name of the modules.
  94name-fix = $(subst $(comma),_,$(subst -,_,$1))
  95basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
  96modname_flags  = $(if $(filter 1,$(words $(modname))),\
  97                 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
  98
  99#hash values
 100ifdef CONFIG_DYNAMIC_PRINTK_DEBUG
 101debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\
 102              -D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))"
 103else
 104debug_flags =
 105endif
 106
 107orig_c_flags   = $(KBUILD_CFLAGS) $(ccflags-y) $(CFLAGS_$(basetarget).o)
 108_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 109_a_flags       = $(KBUILD_AFLAGS) $(asflags-y) $(AFLAGS_$(basetarget).o)
 110_cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 111
 112# If building the kernel in a separate objtree expand all occurrences
 113# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 114
 115ifeq ($(KBUILD_SRC),)
 116__c_flags       = $(_c_flags)
 117__a_flags       = $(_a_flags)
 118__cpp_flags     = $(_cpp_flags)
 119else
 120
 121# -I$(obj) locates generated .h files
 122# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 123#   and locates generated .h files
 124# FIXME: Replace both with specific CFLAGS* statements in the makefiles
 125__c_flags       = $(call addtree,-I$(obj)) $(call flags,_c_flags)
 126__a_flags       =                          $(call flags,_a_flags)
 127__cpp_flags     =                          $(call flags,_cpp_flags)
 128endif
 129
 130c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
 131                 $(__c_flags) $(modkern_cflags) \
 132                 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \
 133                  $(debug_flags)
 134
 135a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(KBUILD_CPPFLAGS) \
 136                 $(__a_flags) $(modkern_aflags)
 137
 138cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(__cpp_flags)
 139
 140ld_flags       = $(LDFLAGS) $(ldflags-y)
 141
 142# Finds the multi-part object the current object will be linked into
 143modname-multi = $(sort $(foreach m,$(multi-used),\
 144                $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 145
 146# Shipped files
 147# ===========================================================================
 148
 149quiet_cmd_shipped = SHIPPED $@
 150cmd_shipped = cat $< > $@
 151
 152$(obj)/%:: $(src)/%_shipped
 153        $(call cmd,shipped)
 154
 155# Commands useful for building a boot image
 156# ===========================================================================
 157# 
 158#       Use as following:
 159#
 160#       target: source(s) FORCE
 161#               $(if_changed,ld/objcopy/gzip)
 162#
 163#       and add target to extra-y so that we know we have to
 164#       read in the saved command line
 165
 166# Linking
 167# ---------------------------------------------------------------------------
 168
 169quiet_cmd_ld = LD      $@
 170cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 171               $(filter-out FORCE,$^) -o $@ 
 172
 173# Objcopy
 174# ---------------------------------------------------------------------------
 175
 176quiet_cmd_objcopy = OBJCOPY $@
 177cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 178
 179# Gzip
 180# ---------------------------------------------------------------------------
 181
 182quiet_cmd_gzip = GZIP    $@
 183cmd_gzip = gzip -f -9 < $< > $@
 184
 185
 186
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