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,$(modname)))")
 103
 104 #hash values
 105 ifdef CONFIG_DYNAMIC_DEBUG
 106 debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\
 107               -D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))"
 108 else
 109 debug_flags =
 110 endif
 111
 112 orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
 113                  $(ccflags-y) $(CFLAGS_$(basetarget).o)
 114 _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
 115 _a_flags       = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
 116                  $(asflags-y) $(AFLAGS_$(basetarget).o)
 117 _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
 118
 119 #
 120 # Enable gcov profiling flags for a file, directory or for all files depending
 121 # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
 122 # (in this order)
 123 #
 124 ifeq ($(CONFIG_GCOV_KERNEL),y)
 125 _c_flags += $(if $(patsubst n%,, \
 126                 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 127                 $(CFLAGS_GCOV))
 128 endif
 129
 130 # If building the kernel in a separate objtree expand all occurrences
 131 # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 132
 133 ifeq ($(KBUILD_SRC),)
 134 __c_flags       = $(_c_flags)
 135 __a_flags       = $(_a_flags)
 136 __cpp_flags     = $(_cpp_flags)
 137 else
 138
 139 # -I$(obj) locates generated .h files
 140 # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 141 #   and locates generated .h files
 142 # FIXME: Replace both with specific CFLAGS* statements in the makefiles
 143 __c_flags       = $(call addtree,-I$(obj)) $(call flags,_c_flags)
 144 __a_flags       =                          $(call flags,_a_flags)
 145 __cpp_flags     =                          $(call flags,_cpp_flags)
 146 endif
 147
 148 c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 149                  $(__c_flags) $(modkern_cflags)                           \
 150                  -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \
 151                   $(debug_flags)
 152
 153 a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 154                  $(__a_flags) $(modkern_aflags)
 155
 156 cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
 157                  $(__cpp_flags)
 158
 159 ld_flags       = $(LDFLAGS) $(ldflags-y)
 160
 161 # Finds the multi-part object the current object will be linked into
 162 modname-multi = $(sort $(foreach m,$(multi-used),\
 163                 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 164
 165 # Shipped files
 166 # ===========================================================================
 167
 168 quiet_cmd_shipped = SHIPPED $@
 169 cmd_shipped = cat $< > $@
 170
 171 $(obj)/%:: $(src)/%_shipped
 172         $(call cmd,shipped)
 173
 174 # Commands useful for building a boot image
 175 # ===========================================================================
 176 #
 177 #       Use as following:
 178 #
 179 #       target: source(s) FORCE
 180 #               $(if_changed,ld/objcopy/gzip)
 181 #
 182 #       and add target to extra-y so that we know we have to
 183 #       read in the saved command line
 184
 185 # Linking
 186 # ---------------------------------------------------------------------------
 187
 188 quiet_cmd_ld = LD      $@
 189 cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 190                $(filter-out FORCE,$^) -o $@
 191
 192 # Objcopy
 193 # ---------------------------------------------------------------------------
 194
 195 quiet_cmd_objcopy = OBJCOPY $@
 196 cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 197
 198 # Gzip
 199 # ---------------------------------------------------------------------------
 200
 201 quiet_cmd_gzip = GZIP    $@
 202 cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
 203         (rm -f $@ ; false)
 204
 205
 206 # Bzip2
 207 # ---------------------------------------------------------------------------
 208
 209 # Bzip2 and LZMA do not include size in file... so we have to fake that;
 210 # append the size as a 32-bit littleendian number as gzip does.
 211 size_append = /bin/echo -ne $(shell                                     \
 212 dec_size=0;                                                             \
 213 for F in $1; do                                                         \
 214         fsize=$$(stat -c "%s" $$F);                                     \
 215         dec_size=$$(expr $$dec_size + $$fsize);                         \
 216 done;                                                                   \
 217 printf "%08x" $$dec_size |                                              \
 218         sed 's/\(..\)\(..\)\(..\)\(..\)/\\\\x\4\\\\x\3\\\\x\2\\\\x\1/g' \
 219 )
 220
 221 quiet_cmd_bzip2 = BZIP2   $@
 222 cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 223         bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 224         (rm -f $@ ; false)
 225
 226 # Lzma
 227 # ---------------------------------------------------------------------------
 228
 229 quiet_cmd_lzma = LZMA    $@
 230 cmd_lzma = (cat $(filter-out FORCE,$^) | \
 231         lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 232         (rm -f $@ ; false)