kbuild: comments cleanup in Makefile.lib

cppflags-y += $(EXTRA_CPPFLAGS)

ldflags-y  += $(EXTRA_LDFLAGS)

#

# flags that take effect in sub directories

# flags that take effect in current and sub directories

export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)

export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)

# 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)))

# 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))

# Handle objects in subdirs

# ---------------------------------------------------------------------------

#   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)))

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

# if $(foo-objs), $(foo-y), or $(foo-m) 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:.o=-m))), $(m))))

multi-used   := $(multi-used-y) $(multi-used-m)

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

# $(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