akaros/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,$(modname)))")
 103
 104#hash values
 105ifdef CONFIG_DYNAMIC_DEBUG
 106debug_flags = -D"DEBUG_HASH=$(shell ./scripts/basic/hash djb2 $(@D)$(modname))"\
 107              -D"DEBUG_HASH2=$(shell ./scripts/basic/hash r5 $(@D)$(modname))"
 108else
 109debug_flags =
 110endif
 111
 112orig_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#
 124ifeq ($(CONFIG_GCOV_KERNEL),y)
 125_c_flags += $(if $(patsubst n%,, \
 126                $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
 127                $(CFLAGS_GCOV))
 128endif
 129
 130ifdef CONFIG_SYMBOL_PREFIX
 131_cpp_flags += -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
 132endif
 133
 134
 135# If building the kernel in a separate objtree expand all occurrences
 136# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
 137
 138ifeq ($(KBUILD_SRC),)
 139__c_flags       = $(_c_flags)
 140__a_flags       = $(_a_flags)
 141__cpp_flags     = $(_cpp_flags)
 142else
 143
 144# -I$(obj) locates generated .h files
 145# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
 146#   and locates generated .h files
 147# FIXME: Replace both with specific CFLAGS* statements in the makefiles
 148__c_flags       = $(call addtree,-I$(obj)) $(call flags,_c_flags)
 149__a_flags       =                          $(call flags,_a_flags)
 150__cpp_flags     =                          $(call flags,_cpp_flags)
 151endif
 152
 153c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(AKAROSINCLUDE)    \
 154                 $(__c_flags) $(modkern_cflags)                           \
 155                 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) \
 156                  $(debug_flags)
 157
 158a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(AKAROSINCLUDE)    \
 159                 $(__a_flags) $(modkern_aflags)
 160
 161cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(AKAROSINCLUDE)    \
 162                 $(__cpp_flags)
 163
 164ld_flags       = $(LDFLAGS) $(ldflags-y)
 165
 166# Finds the multi-part object the current object will be linked into
 167modname-multi = $(sort $(foreach m,$(multi-used),\
 168                $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
 169
 170# Shipped files
 171# ===========================================================================
 172
 173quiet_cmd_shipped = SHIPPED $@
 174cmd_shipped = cat $< > $@
 175
 176$(obj)/%:: $(src)/%_shipped
 177        $(call cmd,shipped)
 178
 179# Commands useful for building a boot image
 180# ===========================================================================
 181# 
 182#       Use as following:
 183#
 184#       target: source(s) FORCE
 185#               $(if_changed,ld/objcopy/gzip)
 186#
 187#       and add target to extra-y so that we know we have to
 188#       read in the saved command line
 189
 190# Linking
 191# ---------------------------------------------------------------------------
 192
 193quiet_cmd_ld = LD      $@
 194cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
 195               $(filter-out FORCE,$^) -o $@ 
 196
 197# Objcopy
 198# ---------------------------------------------------------------------------
 199
 200quiet_cmd_objcopy = OBJCOPY $@
 201cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
 202
 203# Gzip
 204# ---------------------------------------------------------------------------
 205
 206quiet_cmd_gzip = GZIP    $@
 207cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -f -9 > $@) || \
 208        (rm -f $@ ; false)
 209
 210
 211# Bzip2
 212# ---------------------------------------------------------------------------
 213
 214# Bzip2 and LZMA do not include size in file... so we have to fake that;
 215# append the size as a 32-bit littleendian number as gzip does.
 216size_append = printf $(shell                                            \
 217dec_size=0;                                                             \
 218for F in $1; do                                                         \
 219        fsize=$$(stat -c "%s" $$F);                                     \
 220        dec_size=$$(expr $$dec_size + $$fsize);                         \
 221done;                                                                   \
 222printf "%08x\n" $$dec_size |                                            \
 223        sed 's/\(..\)/\1 /g' | {                                        \
 224                read ch0 ch1 ch2 ch3;                                   \
 225                for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
 226                        printf '%s%03o' '\\' $$((0x$$ch));              \
 227                done;                                                   \
 228        }                                                               \
 229)
 230
 231quiet_cmd_bzip2 = BZIP2   $@
 232cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
 233        bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 234        (rm -f $@ ; false)
 235
 236# Lzma
 237# ---------------------------------------------------------------------------
 238
 239quiet_cmd_lzma = LZMA    $@
 240cmd_lzma = (cat $(filter-out FORCE,$^) | \
 241        lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 242        (rm -f $@ ; false)
 243
 244quiet_cmd_lzo = LZO    $@
 245cmd_lzo = (cat $(filter-out FORCE,$^) | \
 246        lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
 247        (rm -f $@ ; false)
 248