scripts/Makefile.lib

   1 # Backward compatibility
   2 asflags-y  += $(EXTRA_AFLAGS)
   3 ccflags-y  += $(EXTRA_CFLAGS)
   4 cppflags-y += $(EXTRA_CPPFLAGS)
   5 ldflags-y  += $(EXTRA_LDFLAGS)
   6
   7 #
   8 # flags that take effect in sub directories
   9 export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
  10 export 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
  18 obj-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
  23 lib-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.
  36 modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
  37
  38 __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
  39 subdir-y        += $(__subdir-y)
  40 __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
  41 subdir-m        += $(__subdir-m)
  42 obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
  43 obj-m           := $(filter-out %/, $(obj-m))
  44
  45 # Subdirectories we need to descend into
  46
  47 subdir-ym       := $(sort $(subdir-y) $(subdir-m))
  48
  49 # if $(foo-objs) exists, foo.o is a composite object
  50 multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  51 multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
  52 multi-used   := $(multi-used-y) $(multi-used-m)
  53 single-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)
  57 multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
  58 multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
  59 multi-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
  63 subdir-obj-y := $(filter %/built-in.o, $(obj-y))
  64
  65 # $(obj-dirs) is a list of directories that contain object files
  66 obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
  67
  68 # Replace multi-part objects by their individual parts, look at local dir only
  69 real-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)
  70 real-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
  74 extra-y         := $(addprefix $(obj)/,$(extra-y))
  75 always          := $(addprefix $(obj)/,$(always))
  76 targets         := $(addprefix $(obj)/,$(targets))
  77 modorder        := $(addprefix $(obj)/,$(modorder))
  78 obj-y           := $(addprefix $(obj)/,$(obj-y))
  79 obj-m           := $(addprefix $(obj)/,$(obj-m))
  80 lib-y           := $(addprefix $(obj)/,$(lib-y))
  81 subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
  82 real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
  83 real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
  84 single-used-m   := $(addprefix $(obj)/,$(single-used-m))
  85 multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
  86 multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
  87 multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
  88 multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
  89 subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
  90 obj-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.
  99 name-fix = $(subst $(comma),_,$(subst -,_,$1))
 100 basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
 101 modname_flags  = $(if $(filter 1,$(words $(modname))),\
 102                  -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
 103
 104 orig_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 #
 116 ifeq ($(CONFIG_GCOV_KERNEL),y)
 117 _c_flags += $(if $(patsubst n%,, \
 118                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 119                 $(CFLAGS_GCOV))
 120 endif
 121
 122 ifdef CONFIG_SYMBOL_PREFIX
 123 _sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
 124 _cpp_flags += $(_sym_flags)
 125 _a_flags += $(_sym_flags)
 126 endif
 127
 128
 129 # If building the kernel in a separate objtree expand all occurrences
 130 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 131
 132 ifeq ($(KBUILD_SRC),)
 133 __c_flags       = $(_c_flags)
 134 __a_flags       = $(_a_flags)
 135 __cpp_flags     = $(_cpp_flags)
 136 else
 137
 138 # -I$(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     =                          $(call flags,_cpp_flags)
 145 endif
 146
 147 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 148                  $(__c_flags) $(modkern_cflags)                           \
 149                  -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
 150
 151 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 152                  $(__a_flags) $(modkern_aflags)
 153
 154 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 155                  $(__cpp_flags)
 156
 157 ld_flags       = $(LDFLAGS) $(ldflags-y)
 158
 159 # Finds the multi-part object the current object will be linked into
 160 modname-multi = $(sort $(foreach m,$(multi-used),\
 161                 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 162
 163 # Shipped files
 164 # ===========================================================================
 165
 166 quiet_cmd_shipped = SHIPPED $@
 167 cmd_shipped = cat $< > $@
 168
 169 $(obj)/%:: $(src)/%_shipped
 170         $(call cmd,shipped)
 171
 172 # Commands useful for building a boot image
 173 # ===========================================================================
 174 #
 175 #       Use as following:
 176 #
 177 #       target: source(s) FORCE
 178 #               $(if_changed,ld/objcopy/gzip)
 179 #
 180 #       and add target to extra-y so that we know we have to
 181 #       read in the saved command line
 182
 183 # Linking
 184 # ---------------------------------------------------------------------------
 185
 186 quiet_cmd_ld = LD      $@
 187 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 188                $(filter-out FORCE,$^) -o $@
 189
 190 # Objcopy
 191 # ---------------------------------------------------------------------------
 192
 193 quiet_cmd_objcopy = OBJCOPY $@
 194 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 195
 196 # Gzip
 197 # ---------------------------------------------------------------------------
 198
 199 quiet_cmd_gzip = GZIP    $@
 200 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
 201         (rm -f $@ ; false)
 202
 203
 204 # Bzip2
 205 # ---------------------------------------------------------------------------
 206
 207 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 208 # append the size as a 32-bit littleendian number as gzip does.
 209 size_append = printf $(shell                                            \
 210 dec_size=0;                                                             \
 211 for F in $1; do                                                         \
 212         fsize=$$(stat -c "%s" $$F);                                     \
 213         dec_size=$$(expr $$dec_size + $$fsize);                         \
 214 done;                                                                   \
 215 printf "%08x\n" $$dec_size |                                            \
 216         sed 's/\(..\)/\1 /g' | {                                        \
 217                 read ch0 ch1 ch2 ch3;                                   \
 218                 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 219                         printf '%s%03o' '\\' $$((0x$$ch));              \
 220                 done;                                                   \
 221         }                                                               \
 222 )
 223
 224 quiet_cmd_bzip2 = BZIP2   $@
 225 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 226         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 227         (rm -f $@ ; false)
 228
 229 # Lzma
 230 # ---------------------------------------------------------------------------
 231
 232 quiet_cmd_lzma = LZMA    $@
 233 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 234         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 235         (rm -f $@ ; false)
 236
 237 quiet_cmd_lzo = LZO     $@
 238 cmd_lzo = (cat $(filter-out FORCE,$^) | \
 239         lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 240         (rm -f $@ ; false)
 241
 242 # misc stuff
 243 # ---------------------------------------------------------------------------
 244 quote:="