--- /dev/null
+# BSD LICENSE
+#
+# Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in
+# the documentation and/or other materials provided with the
+# distribution.
+# * Neither the name of Intel Corporation nor the names of its
+# contributors may be used to endorse or promote products derived
+# from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#
+# Common to rte.lib.mk, rte.app.mk, rte.obj.mk
+#
+
+SRCS-all := $(SRCS-y) $(SRCS-n) $(SRCS-)
+
+# convert source to obj file
+src2obj = $(strip $(patsubst %.c,%.o,\
+ $(patsubst %.S,%_s.o,$(1))))
+
+# add a dot in front of the file name
+dotfile = $(strip $(foreach f,$(1),\
+ $(join $(dir $f),.$(notdir $f))))
+
+# convert source/obj files into dot-dep filename (does not
+# include .S files)
+src2dep = $(strip $(call dotfile,$(patsubst %.c,%.o.d, \
+ $(patsubst %.S,,$(1)))))
+obj2dep = $(strip $(call dotfile,$(patsubst %.o,%.o.d,$(1))))
+
+# convert source/obj files into dot-cmd filename
+src2cmd = $(strip $(call dotfile,$(patsubst %.c,%.o.cmd, \
+ $(patsubst %.S,%_s.o.cmd,$(1)))))
+obj2cmd = $(strip $(call dotfile,$(patsubst %.o,%.o.cmd,$(1))))
+
+OBJS-y := $(call src2obj,$(SRCS-y))
+OBJS-n := $(call src2obj,$(SRCS-n))
+OBJS- := $(call src2obj,$(SRCS-))
+OBJS-all := $(filter-out $(SRCS-all),$(OBJS-y) $(OBJS-n) $(OBJS-))
+
+DEPS-y := $(call src2dep,$(SRCS-y))
+DEPS-n := $(call src2dep,$(SRCS-n))
+DEPS- := $(call src2dep,$(SRCS-))
+DEPS-all := $(DEPS-y) $(DEPS-n) $(DEPS-)
+DEPSTMP-all := $(DEPS-all:%.d=%.d.tmp)
+
+CMDS-y := $(call src2cmd,$(SRCS-y))
+CMDS-n := $(call src2cmd,$(SRCS-n))
+CMDS- := $(call src2cmd,$(SRCS-))
+CMDS-all := $(CMDS-y) $(CMDS-n) $(CMDS-)
+
+-include $(DEPS-y) $(CMDS-y)
+
+# command to compile a .c file to generate an object
+ifeq ($(USE_HOST),1)
+C_TO_O = $(HOSTCC) -Wp,-MD,$(call obj2dep,$(@)).tmp $(HOST_CFLAGS) \
+ $(CFLAGS_$(@)) $(HOST_EXTRA_CFLAGS) -o $@ -c $<
+C_TO_O_STR = $(subst ','\'',$(C_TO_O)) #'# fix syntax highlight
+C_TO_O_DISP = $(if $(V),"$(C_TO_O_STR)"," HOSTCC $(@)")
+else
+C_TO_O = $(CC) -Wp,-MD,$(call obj2dep,$(@)).tmp $(CFLAGS) \
+ $(CFLAGS_$(@)) $(EXTRA_CFLAGS) -o $@ -c $<
+C_TO_O_STR = $(subst ','\'',$(C_TO_O)) #'# fix syntax highlight
+C_TO_O_DISP = $(if $(V),"$(C_TO_O_STR)"," CC $(@)")
+endif
+C_TO_O_CMD = 'cmd_$@ = $(C_TO_O_STR)'
+C_TO_O_DO = @set -e; \
+ echo $(C_TO_O_DISP); \
+ $(C_TO_O) && \
+ echo $(C_TO_O_CMD) > $(call obj2cmd,$(@)) && \
+ sed 's,'$@':,dep_'$@' =,' $(call obj2dep,$(@)).tmp > $(call obj2dep,$(@)) && \
+ rm -f $(call obj2dep,$(@)).tmp
+
+# return an empty string if string are equal
+compare = $(strip $(subst $(1),,$(2)) $(subst $(2),,$(1)))
+
+# return a non-empty string if the dst file does not exist
+file_missing = $(call compare,$(wildcard $@),$@)
+
+# return a non-empty string if cmdline changed
+cmdline_changed = $(call compare,$(strip $(cmd_$@)),$(strip $(1)))
+
+# return a non-empty string if a dependency file does not exist
+depfile_missing = $(call compare,$(wildcard $(dep_$@)),$(dep_$@))
+
+# return an empty string if no prereq is newer than target
+# - $^ -> names of all the prerequisites
+# - $(wildcard $^) -> every existing prereq
+# - $(filter-out $(wildcard $^),$^) -> every prereq that don't
+# exist (filter-out removes existing ones from the list)
+# - $? -> names of all the prerequisites newer than target
+depfile_newer = $(strip $(filter-out FORCE,$? \
+ $(filter-out $(wildcard $^),$^)))
+
+# return 1 if parameter is a non-empty string, else 0
+boolean = $(if $1,1,0)
+
+#
+# Compile .c file if needed
+# Note: dep_$$@ is from the .d file and DEP_$$@ can be specified by
+# user (by default it is empty)
+#
+.SECONDEXPANSION:
+%.o: %.c $$(wildcard $$(dep_$$@)) $$(DEP_$$(@)) FORCE
+ @[ -d $(dir $@) ] || mkdir -p $(dir $@)
+ $(if $(D),\
+ @echo -n "$< -> $@ " ; \
+ echo -n "file_missing=$(call boolean,$(file_missing)) " ; \
+ echo -n "cmdline_changed=$(call boolean,$(call cmdline_changed,$(C_TO_O))) " ; \
+ echo -n "depfile_missing=$(call boolean,$(depfile_missing)) " ; \
+ echo "depfile_newer=$(call boolean,$(depfile_newer))")
+ $(if $(or \
+ $(file_missing),\
+ $(call cmdline_changed,$(C_TO_O)),\
+ $(depfile_missing),\
+ $(depfile_newer)),\
+ $(C_TO_O_DO))
+
+# command to assemble a .S file to generate an object
+ifeq ($(USE_HOST),1)
+S_TO_O = $(CPP) $(HOST_CPPFLAGS) $($(@)_CPPFLAGS) $(HOST_EXTRA_CPPFLAGS) $< $(@).tmp && \
+ $(HOSTAS) $(HOST_ASFLAGS) $($(@)_ASFLAGS) $(HOST_EXTRA_ASFLAGS) -o $@ $(@).tmp
+S_TO_O_STR = $(subst ','\'',$(S_TO_O)) #'# fix syntax highlight
+S_TO_O_DISP = $(if $(V),"$(S_TO_O_STR)"," HOSTAS $(@)")
+else
+S_TO_O = $(CPP) $(CPPFLAGS) $($(@)_CPPFLAGS) $(EXTRA_CPPFLAGS) $< -o $(@).tmp && \
+ $(AS) $(ASFLAGS) $($(@)_ASFLAGS) $(EXTRA_ASFLAGS) -o $@ $(@).tmp
+S_TO_O_STR = $(subst ','\'',$(S_TO_O)) #'# fix syntax highlight
+S_TO_O_DISP = $(if $(V),"$(S_TO_O_STR)"," AS $(@)")
+endif
+
+S_TO_O_CMD = "cmd_$@ = $(S_TO_O_STR)"
+S_TO_O_DO = @set -e; \
+ echo $(S_TO_O_DISP); \
+ $(S_TO_O) && \
+ echo $(S_TO_O_CMD) > $(call obj2cmd,$(@))
+
+#
+# Compile .S file if needed
+# Note: DEP_$$@ can be specified by user (by default it is empty)
+#
+%_s.o: %.S $$(DEP_$$@) FORCE
+ @[ ! -d $(dir $@) ] || mkdir -p $(dir $@)
+ $(if $(D),\
+ @echo -n "$< -> $@ " ; \
+ echo -n "file_missing=$(call boolean,$(file_missing)) " ; \
+ echo -n "cmdline_changed=$(call boolean,$(call cmdline_changed,$(S_TO_O_STR))) " ; \
+ echo -n "depfile_missing=$(call boolean,$(depfile_missing)) " ; \
+ echo "depfile_newer=$(call boolean,$(depfile_newer)) ")
+ $(if $(or \
+ $(file_missing),\
+ $(call cmdline_changed,$(S_TO_O_STR)),\
+ $(depfile_missing),\
+ $(depfile_newer)),\
+ $(S_TO_O_DO))
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