# ==========================================================================

# Cleaning up

# ==========================================================================

src := $(obj)

PHONY := __clean

__clean:

# Shorthand for $(Q)$(MAKE) scripts/Makefile.clean obj=dir

# Usage:

# $(Q)$(MAKE) $(clean)=dir

clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj

# The filename Kbuild has precedence over Makefile

kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))

include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile)

# Figure out what we need to build from the various variables

# ==========================================================================

__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))

subdir-y += $(__subdir-y)

__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))

subdir-m += $(__subdir-m)

__subdir-n := $(patsubst %/,%,$(filter %/, $(obj-n)))

subdir-n += $(__subdir-n)

__subdir- := $(patsubst %/,%,$(filter %/, $(obj-)))

subdir- += $(__subdir-)

# Subdirectories we need to descend into

subdir-ym := $(sort $(subdir-y) $(subdir-m))

subdir-ymn := $(sort $(subdir-ym) $(subdir-n) $(subdir-))

# Add subdir path

subdir-ymn := $(addprefix $(obj)/,$(subdir-ymn))

# build a list of files to remove, usually relative to the current

# directory

__clean-files := $(extra-y) $(always) \

$(targets) $(clean-files) \

$(host-progs) \

$(hostprogs-y) $(hostprogs-m) $(hostprogs-)

__clean-files := $(filter-out $(no-clean-files), $(__clean-files))

# as clean-files is given relative to the current directory, this adds

# a $(obj) prefix, except for absolute paths

__clean-files := $(wildcard \

$(addprefix $(obj)/, $(filter-out /%, $(__clean-files))) \

$(filter /%, $(__clean-files)))

# as clean-dirs is given relative to the current directory, this adds

# a $(obj) prefix, except for absolute paths

__clean-dirs := $(wildcard \

$(addprefix $(obj)/, $(filter-out /%, $(clean-dirs))) \

$(filter /%, $(clean-dirs)))

# ==========================================================================

quiet_cmd_clean = CLEAN $(obj)

cmd_clean = rm -f $(__clean-files)

quiet_cmd_cleandir = CLEAN $(__clean-dirs)

cmd_cleandir = rm -rf $(__clean-dirs)

__clean: $(subdir-ymn)

ifneq ($(strip $(__clean-files)),)

+$(call cmd,clean)

endif

ifneq ($(strip $(__clean-dirs)),)

+$(call cmd,cleandir)

endif

ifneq ($(strip $(clean-rule)),)

+$(clean-rule)

endif

@:

# ===========================================================================

# Generic stuff

# ===========================================================================

# Descending

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

PHONY += $(subdir-ymn)

$(subdir-ymn):

$(Q)$(MAKE) $(clean)=$@

# If quiet is set, only print short version of command

cmd = @$(if $($(quiet)cmd_$(1)),echo ' $($(quiet)cmd_$(1))' &&) $(cmd_$(1))

# Declare the contents of the .PHONY variable as phony. We keep that

# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)

# ==========================================================================

# Building binaries on the host system

# Binaries are used during the compilation of the kernel, for example

# to preprocess a data file.

#

# Both C and C++ are supported, but preferred language is C for such utilities.

#

# Sample syntax (see Documentation/kbuild/makefiles.txt for reference)

# hostprogs-y := bin2hex

# Will compile bin2hex.c and create an executable named bin2hex

#

# hostprogs-y := lxdialog

# lxdialog-objs := checklist.o lxdialog.o

# Will compile lxdialog.c and checklist.c, and then link the executable

# lxdialog, based on checklist.o and lxdialog.o

#

# hostprogs-y := qconf

# qconf-cxxobjs := qconf.o

# qconf-objs := menu.o

# Will compile qconf as a C++ program, and menu as a C program.

# They are linked as C++ code to the executable qconf

# hostprogs-y := conf

# conf-objs := conf.o libkconfig.so

# libkconfig-objs := expr.o type.o

# Will create a shared library named libkconfig.so that consists of

# expr.o and type.o (they are both compiled as C code and the object files

# are made as position independent code).

# conf.c is compiled as a C program, and conf.o is linked together with

# libkconfig.so as the executable conf.

# Note: Shared libraries consisting of C++ files are not supported

__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))

# C code

# Executables compiled from a single .c file

host-csingle := $(foreach m,$(__hostprogs),$(if $($(m)-objs),,$(m)))

# C executables linked based on several .o files

host-cmulti := $(foreach m,$(__hostprogs),\

$(if $($(m)-cxxobjs),,$(if $($(m)-objs),$(m))))

# Object (.o) files compiled from .c files

host-cobjs := $(sort $(foreach m,$(__hostprogs),$($(m)-objs)))

# C++ code

# C++ executables compiled from at least on .cc file

# and zero or more .c files

host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))

# C++ Object (.o) files compiled from .cc files

host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))

# Shared libaries (only .c supported)

# Shared libraries (.so) - all .so files referenced in "xxx-objs"

host-cshlib := $(sort $(filter %.so, $(host-cobjs)))

# Remove .so files from "xxx-objs"

host-cobjs := $(filter-out %.so,$(host-cobjs))

#Object (.o) files used by the shared libaries

host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))

# output directory for programs/.o files

# hostprogs-y := tools/build may have been specified. Retrieve directory

host-objdirs := $(foreach f,$(__hostprogs), $(if $(dir $(f)),$(dir $(f))))

# directory of .o files from prog-objs notation

host-objdirs += $(foreach f,$(host-cmulti), \

$(foreach m,$($(f)-objs), \

$(if $(dir $(m)),$(dir $(m)))))

# directory of .o files from prog-cxxobjs notation

host-objdirs += $(foreach f,$(host-cxxmulti), \

$(foreach m,$($(f)-cxxobjs), \

$(if $(dir $(m)),$(dir $(m)))))

host-objdirs := $(strip $(sort $(filter-out ./,$(host-objdirs))))

__hostprogs := $(addprefix $(obj)/,$(__hostprogs))

host-csingle := $(addprefix $(obj)/,$(host-csingle))

host-cmulti := $(addprefix $(obj)/,$(host-cmulti))

host-cobjs := $(addprefix $(obj)/,$(host-cobjs))

host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))

host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))

host-cshlib := $(addprefix $(obj)/,$(host-cshlib))

host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))

host-objdirs := $(addprefix $(obj)/,$(host-objdirs))

obj-dirs += $(host-objdirs)

#####

# Handle options to gcc. Support building with separate output directory

_hostc_flags = $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) \

$(HOSTCFLAGS_$(basetarget).o)

_hostcxx_flags = $(HOSTCXXFLAGS) $(HOST_EXTRACXXFLAGS) \

$(HOSTCXXFLAGS_$(basetarget).o)

ifeq ($(KBUILD_SRC),)

__hostc_flags = $(_hostc_flags)

__hostcxx_flags = $(_hostcxx_flags)

else

__hostc_flags = -I$(obj) $(call flags,_hostc_flags)

__hostcxx_flags = -I$(obj) $(call flags,_hostcxx_flags)

endif

hostc_flags = -Wp,-MD,$(depfile) $(__hostc_flags)

hostcxx_flags = -Wp,-MD,$(depfile) $(__hostcxx_flags)

#####

# Compile programs on the host

# Create executable from a single .c file

# host-csingle -> Executable

quiet_cmd_host-csingle = HOSTCC $@

cmd_host-csingle = $(HOSTCC) $(hostc_flags) -o $@ $< \

$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))

$(host-csingle): $(obj)/%: $(src)/%.c FORCE

$(call if_changed_dep,host-csingle)

# Link an executable based on list of .o files, all plain c

# host-cmulti -> executable

quiet_cmd_host-cmulti = HOSTLD $@

cmd_host-cmulti = $(HOSTCC) $(HOSTLDFLAGS) -o $@ \

$(addprefix $(obj)/,$($(@F)-objs)) \

$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))

$(host-cmulti): $(obj)/%: $(host-cobjs) $(host-cshlib) FORCE

$(call if_changed,host-cmulti)

# Create .o file from a single .c file

# host-cobjs -> .o

quiet_cmd_host-cobjs = HOSTCC $@

cmd_host-cobjs = $(HOSTCC) $(hostc_flags) -c -o $@ $<

$(host-cobjs): $(obj)/%.o: $(src)/%.c FORCE

$(call if_changed_dep,host-cobjs)

# Link an executable based on list of .o files, a mixture of .c and .cc

# host-cxxmulti -> executable

quiet_cmd_host-cxxmulti = HOSTLD $@

cmd_host-cxxmulti = $(HOSTCXX) $(HOSTLDFLAGS) -o $@ \

$(foreach o,objs cxxobjs,\

$(addprefix $(obj)/,$($(@F)-$(o)))) \

$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))

$(host-cxxmulti): $(obj)/%: $(host-cobjs) $(host-cxxobjs) $(host-cshlib) FORCE

$(call if_changed,host-cxxmulti)

# Create .o file from a single .cc (C++) file

quiet_cmd_host-cxxobjs = HOSTCXX $@

cmd_host-cxxobjs = $(HOSTCXX) $(hostcxx_flags) -c -o $@ $<

$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE

$(call if_changed_dep,host-cxxobjs)

# Compile .c file, create position independent .o file

# host-cshobjs -> .o

quiet_cmd_host-cshobjs = HOSTCC -fPIC $@

cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<

$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE

$(call if_changed_dep,host-cshobjs)

# Link a shared library, based on position independent .o files

# *.o -> .so shared library (host-cshlib)

quiet_cmd_host-cshlib = HOSTLLD -shared $@

cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \

$(addprefix $(obj)/,$($(@F:.so=-objs))) \

$(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))

$(host-cshlib): $(obj)/%: $(host-cshobjs) FORCE

$(call if_changed,host-cshlib)

targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\

$(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs)