FreeBSD/Linux Kernel Cross Reference
sys/scripts/Makefile.lib

     # Backward compatibility
     asflags-y  += $(EXTRA_AFLAGS)
     ccflags-y  += $(EXTRA_CFLAGS)
     cppflags-y += $(EXTRA_CPPFLAGS)
     ldflags-y  += $(EXTRA_LDFLAGS)
     
     #
     # flags that take effect in sub directories
     export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
    export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
    
    # Figure out what we need to build from the various variables
    # ===========================================================================
    
    # When an object is listed to be built compiled-in and modular,
    # only build the compiled-in version
    
    obj-m := $(filter-out $(obj-y),$(obj-m))
    
    # Libraries are always collected in one lib file.
    # Filter out objects already built-in
    
    lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
    
    
    # Handle objects in subdirs
    # ---------------------------------------------------------------------------
    # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
    #   and add the directory to the list of dirs to descend into: $(subdir-y)
    # o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 
    #   and add the directory to the list of dirs to descend into: $(subdir-m)
    
    # Determine modorder.
    # Unfortunately, we don't have information about ordering between -y
    # and -m subdirs.  Just put -y's first.
    modorder        := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
    
    __subdir-y      := $(patsubst %/,%,$(filter %/, $(obj-y)))
    subdir-y        += $(__subdir-y)
    __subdir-m      := $(patsubst %/,%,$(filter %/, $(obj-m)))
    subdir-m        += $(__subdir-m)
    obj-y           := $(patsubst %/, %/built-in.o, $(obj-y))
    obj-m           := $(filter-out %/, $(obj-m))
    
    # Subdirectories we need to descend into
    
    subdir-ym       := $(sort $(subdir-y) $(subdir-m))
    
    # if $(foo-objs) exists, foo.o is a composite object 
    multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
    multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
    multi-used   := $(multi-used-y) $(multi-used-m)
    single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
    
    # Build list of the parts of our composite objects, our composite
    # objects depend on those (obviously)
    multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
    multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
    multi-objs   := $(multi-objs-y) $(multi-objs-m)
    
    # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
    # tell kbuild to descend
    subdir-obj-y := $(filter %/built-in.o, $(obj-y))
    
    # $(obj-dirs) is a list of directories that contain object files
    obj-dirs := $(dir $(multi-objs) $(subdir-obj-y))
    
    # Replace multi-part objects by their individual parts, look at local dir only
    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)
    real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
    
    # Add subdir path
    
    extra-y         := $(addprefix $(obj)/,$(extra-y))
    always          := $(addprefix $(obj)/,$(always))
    targets         := $(addprefix $(obj)/,$(targets))
    modorder        := $(addprefix $(obj)/,$(modorder))
    obj-y           := $(addprefix $(obj)/,$(obj-y))
    obj-m           := $(addprefix $(obj)/,$(obj-m))
    lib-y           := $(addprefix $(obj)/,$(lib-y))
    subdir-obj-y    := $(addprefix $(obj)/,$(subdir-obj-y))
    real-objs-y     := $(addprefix $(obj)/,$(real-objs-y))
    real-objs-m     := $(addprefix $(obj)/,$(real-objs-m))
    single-used-m   := $(addprefix $(obj)/,$(single-used-m))
    multi-used-y    := $(addprefix $(obj)/,$(multi-used-y))
    multi-used-m    := $(addprefix $(obj)/,$(multi-used-m))
    multi-objs-y    := $(addprefix $(obj)/,$(multi-objs-y))
    multi-objs-m    := $(addprefix $(obj)/,$(multi-objs-m))
    subdir-ym       := $(addprefix $(obj)/,$(subdir-ym))
    obj-dirs        := $(addprefix $(obj)/,$(obj-dirs))
    
    # These flags are needed for modversions and compiling, so we define them here
    # already
    # $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 
    # end up in (or would, if it gets compiled in)
    # Note: Files that end up in two or more modules are compiled without the
    #       KBUILD_MODNAME definition. The reason is that any made-up name would
    #       differ in different configs.
    name-fix = $(subst $(comma),_,$(subst -,_,$1))
   basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))"
   modname_flags  = $(if $(filter 1,$(words $(modname))),\
                    -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))")
   
   orig_c_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
                    $(ccflags-y) $(CFLAGS_$(basetarget).o)
   _c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
   _a_flags       = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
                    $(asflags-y) $(AFLAGS_$(basetarget).o)
   _cpp_flags     = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
   
   #
   # Enable gcov profiling flags for a file, directory or for all files depending
   # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
   # (in this order)
   #
   ifeq ($(CONFIG_GCOV_KERNEL),y)
   _c_flags += $(if $(patsubst n%,, \
                   $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
                   $(CFLAGS_GCOV))
   endif
   
   ifdef CONFIG_SYMBOL_PREFIX
   _sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
   _cpp_flags += $(_sym_flags)
   _a_flags += $(_sym_flags)
   endif
   
   
   # If building the kernel in a separate objtree expand all occurrences
   # of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
   
   ifeq ($(KBUILD_SRC),)
   __c_flags       = $(_c_flags)
   __a_flags       = $(_a_flags)
   __cpp_flags     = $(_cpp_flags)
   else
   
   # -I$(obj) locates generated .h files
   # $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
   #   and locates generated .h files
   # FIXME: Replace both with specific CFLAGS* statements in the makefiles
   __c_flags       = $(call addtree,-I$(obj)) $(call flags,_c_flags)
   __a_flags       =                          $(call flags,_a_flags)
   __cpp_flags     =                          $(call flags,_cpp_flags)
   endif
   
   c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
                    $(__c_flags) $(modkern_cflags)                           \
                    -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags)
   
   a_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
                    $(__a_flags) $(modkern_aflags)
   
   cpp_flags      = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
                    $(__cpp_flags)
   
   ld_flags       = $(LDFLAGS) $(ldflags-y)
   
   # Finds the multi-part object the current object will be linked into
   modname-multi = $(sort $(foreach m,$(multi-used),\
                   $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
   
   ifdef REGENERATE_PARSERS
   
   # GPERF
   # ---------------------------------------------------------------------------
   quiet_cmd_gperf = GPERF $@
         cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $<
   
   .PRECIOUS: $(src)/%.hash.c_shipped
   $(src)/%.hash.c_shipped: $(src)/%.gperf
           $(call cmd,gperf)
   
   # LEX
   # ---------------------------------------------------------------------------
   LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
   
   quiet_cmd_flex = LEX     $@
         cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
   
   .PRECIOUS: $(src)/%.lex.c_shipped
   $(src)/%.lex.c_shipped: $(src)/%.l
           $(call cmd,flex)
   
   # YACC
   # ---------------------------------------------------------------------------
   YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
   
   quiet_cmd_bison = YACC    $@
         cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
   
   .PRECIOUS: $(src)/%.tab.c_shipped
   $(src)/%.tab.c_shipped: $(src)/%.y
           $(call cmd,bison)
   
   quiet_cmd_bison_h = YACC    $@
         cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
   
   .PRECIOUS: $(src)/%.tab.h_shipped
   $(src)/%.tab.h_shipped: $(src)/%.y
           $(call cmd,bison_h)
   
   endif
   
   # Shipped files
   # ===========================================================================
   
   quiet_cmd_shipped = SHIPPED $@
   cmd_shipped = cat $< > $@
   
   $(obj)/%: $(src)/%_shipped
           $(call cmd,shipped)
   
   # Commands useful for building a boot image
   # ===========================================================================
   # 
   #       Use as following:
   #
   #       target: source(s) FORCE
   #               $(if_changed,ld/objcopy/gzip)
   #
   #       and add target to extra-y so that we know we have to
   #       read in the saved command line
   
   # Linking
   # ---------------------------------------------------------------------------
   
   quiet_cmd_ld = LD      $@
   cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
                  $(filter-out FORCE,$^) -o $@ 
   
   # Objcopy
   # ---------------------------------------------------------------------------
   
   quiet_cmd_objcopy = OBJCOPY $@
   cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
   
   # Gzip
   # ---------------------------------------------------------------------------
   
   quiet_cmd_gzip = GZIP    $@
   cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
           (rm -f $@ ; false)
   
   # DTC
   # ---------------------------------------------------------------------------
   
   # Generate an assembly file to wrap the output of the device tree compiler
   quiet_cmd_dt_S_dtb= DTB    $@
   cmd_dt_S_dtb=                                           \
   (                                                       \
           echo '\#include <asm-generic/vmlinux.lds.h>';   \
           echo '.section .dtb.init.rodata,"a"';           \
           echo '.balign STRUCT_ALIGNMENT';                \
           echo '.global __dtb_$(*F)_begin';               \
           echo '__dtb_$(*F)_begin:';                      \
           echo '.incbin "$<" ';                           \
           echo '__dtb_$(*F)_end:';                        \
           echo '.global __dtb_$(*F)_end';                 \
           echo '.balign STRUCT_ALIGNMENT';                \
   ) > $@
   
   $(obj)/%.dtb.S: $(obj)/%.dtb
           $(call cmd,dt_S_dtb)
   
   quiet_cmd_dtc = DTC     $@
   cmd_dtc = $(objtree)/scripts/dtc/dtc -O dtb -o $@ -b 0 $(DTC_FLAGS) -d $(depfile) $<
   
   $(obj)/%.dtb: $(src)/%.dts FORCE
           $(call if_changed_dep,dtc)
   
   # Bzip2
   # ---------------------------------------------------------------------------
   
   # Bzip2 and LZMA do not include size in file... so we have to fake that;
   # append the size as a 32-bit littleendian number as gzip does.
   size_append = printf $(shell                                            \
   dec_size=0;                                                             \
   for F in $1; do                                                         \
           fsize=$$(stat -c "%s" $$F);                                     \
           dec_size=$$(expr $$dec_size + $$fsize);                         \
   done;                                                                   \
   printf "%08x\n" $$dec_size |                                            \
           sed 's/\(..\)/\1 /g' | {                                        \
                   read ch0 ch1 ch2 ch3;                                   \
                   for ch in $$ch3 $$ch2 $$ch1 $$ch0; do                   \
                           printf '%s%03o' '\\' $$((0x$$ch));              \
                   done;                                                   \
           }                                                               \
   )
   
   quiet_cmd_bzip2 = BZIP2   $@
   cmd_bzip2 = (cat $(filter-out FORCE,$^) | \
           bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
           (rm -f $@ ; false)
   
   # Lzma
   # ---------------------------------------------------------------------------
   
   quiet_cmd_lzma = LZMA    $@
   cmd_lzma = (cat $(filter-out FORCE,$^) | \
           lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
           (rm -f $@ ; false)
   
   quiet_cmd_lzo = LZO     $@
   cmd_lzo = (cat $(filter-out FORCE,$^) | \
           lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
           (rm -f $@ ; false)
   
   # U-Boot mkimage
   # ---------------------------------------------------------------------------
   
   MKIMAGE := $(srctree)/scripts/mkuboot.sh
   
   # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
   # the number of overrides in arch makefiles
   UIMAGE_ARCH ?= $(SRCARCH)
   UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
   UIMAGE_OPTS-y ?=
   UIMAGE_TYPE ?= kernel
   UIMAGE_LOADADDR ?= arch_must_set_this
   UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
   UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
   UIMAGE_IN ?= $<
   UIMAGE_OUT ?= $@
   
   quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
         cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
                           -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
                           -T $(UIMAGE_TYPE) \
                           -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
                           -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
   
   # XZ
   # ---------------------------------------------------------------------------
   # Use xzkern to compress the kernel image and xzmisc to compress other things.
   #
   # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
   # of the kernel decompressor. A BCJ filter is used if it is available for
   # the target architecture. xzkern also appends uncompressed size of the data
   # using size_append. The .xz format has the size information available at
   # the end of the file too, but it's in more complex format and it's good to
   # avoid changing the part of the boot code that reads the uncompressed size.
   # Note that the bytes added by size_append will make the xz tool think that
   # the file is corrupt. This is expected.
   #
   # xzmisc doesn't use size_append, so it can be used to create normal .xz
   # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
   # big dictionary would increase the memory usage too much in the multi-call
   # decompression mode. A BCJ filter isn't used either.
   quiet_cmd_xzkern = XZKERN  $@
   cmd_xzkern = (cat $(filter-out FORCE,$^) | \
           sh $(srctree)/scripts/xz_wrap.sh && \
           $(call size_append, $(filter-out FORCE,$^))) > $@ || \
           (rm -f $@ ; false)
   
   quiet_cmd_xzmisc = XZMISC  $@
   cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
           xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
           (rm -f $@ ; false)
   
   # misc stuff
   # ---------------------------------------------------------------------------
   quote:="

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