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+# Rules.mak for uClibc
+#
+# Copyright (C) 2000-2008 Erik Andersen <andersen@uclibc.org>
+#
+# Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+#
+
+# make nano-doc
+# FOO = bar -- recursively expanded variable. Value is remebered verbatim.
+# If it contains references to other variables, these references
+# are expanded whenever this variable is _substituted_.
+# FOO := bar -- simply expanded variable. Right hand is expanded when
+# the variable is _defined_. Therefore faster than =.
+# FOO ?= bar -- set a value only if it is not already set
+# (behaves as =, not :=).
+# FOO += bar -- append; if FOO is not defined, acts like = (not :=).
+
+
+# check for proper make version
+ifneq ($(findstring x3.7,x$(MAKE_VERSION)),)
+$(error Your make is too old $(MAKE_VERSION). Go get at least 3.80)
+endif
+
+#-----------------------------------------------------------
+# This file contains rules which are shared between multiple
+# Makefiles. All normal configuration options live in the
+# file named ".config". Don't mess with this file unless
+# you know what you are doing.
+
+clean_targets := clean realclean distclean \
+ objclean-y headers_clean-y CLEAN_utils
+noconfig_targets := menuconfig config nconfig \
+ oldaskconfig silentoldconfig oldconfig allnoconfig allyesconfig \
+ alldefconfig randconfig defconfig savedefconfig listnewconfig \
+ olddefconfig \
+ xconfig gconfig update-po-config mconf qconf gconf nconf conf \
+ release dist tags help
+
+
+#-----------------------------------------------------------
+# If you are running a cross compiler, you will want to set
+# 'CROSS_COMPILE' to something more interesting ... Target
+# architecture is determined by asking the CC compiler what
+# arch it compiles things for, so unless your compiler is
+# broken, you should not need to specify TARGET_ARCH.
+#
+# Most people will set this stuff on the command line, i.e.
+# make CROSS_COMPILE=arm-linux-
+# will build uClibc for 'arm'.
+# CROSS is still supported for backward compatibily only
+
+CROSS_COMPILE ?= $(CROSS)
+
+CC = $(CROSS_COMPILE)gcc
+AR = $(CROSS_COMPILE)ar
+LD = $(CROSS_COMPILE)ld
+NM = $(CROSS_COMPILE)nm
+OBJDUMP = $(CROSS_COMPILE)objdump
+STRIPTOOL = $(CROSS_COMPILE)strip
+
+INSTALL = install
+LN = ln
+RM = rm -f
+TAR = tar
+SED = sed
+AWK = awk
+
+STRIP_FLAGS ?= -x -R .note -R .comment
+
+# Select the compiler needed to build binaries for your development system
+HOSTCC = gcc
+BUILD_CFLAGS = -Os
+
+#---------------------------------------------------------
+# Nothing beyond this point should ever be touched by mere
+# mortals. Unless you hang out with the gods, you should
+# probably leave all this stuff alone.
+
+# strip quotes
+qstrip = $(strip $(subst ",,$(1)))
+#"))
+
+TARGET_ARCH:=$(call qstrip,$(TARGET_ARCH))
+ifeq ($(TARGET_ARCH),)
+ARCH ?= $(shell uname -m | $(SED) -e s/i.86/i386/ \
+ -e s/sun.*/sparc/ -e s/sparc.*/sparc/ \
+ -e s/arm.*/arm/ -e s/sa110/arm/ \
+ -e s/nds32.*/nds32/ \
+ -e s/sh.*/sh/ \
+ -e s/s390x/s390/ -e s/parisc.*/hppa/ \
+ -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \
+ -e s/xtensa.*/xtensa/ )
+else
+ARCH = $(TARGET_ARCH)
+endif
+export ARCH
+
+# Make certain these contain a final "/", but no "//"s.
+scrub_path = $(strip $(subst //,/, $(subst ,/, $(call qstrip,$(1)))))
+TARGET_SUBARCH := $(call qstrip,$(TARGET_SUBARCH))
+RUNTIME_PREFIX := $(call scrub_path,$(RUNTIME_PREFIX))
+DEVEL_PREFIX := $(call scrub_path,$(DEVEL_PREFIX))
+MULTILIB_DIR := $(call scrub_path,$(MULTILIB_DIR))
+KERNEL_HEADERS := $(call scrub_path,$(KERNEL_HEADERS))
+export RUNTIME_PREFIX DEVEL_PREFIX KERNEL_HEADERS MULTILIB_DIR
+
+# Make sure DESTDIR and PREFIX can be used to install
+# PREFIX is a uClibcism while DESTDIR is a common GNUism
+ifndef PREFIX
+PREFIX = $(DESTDIR)
+endif
+
+comma:=,
+space:= #
+
+ifeq ($(CROSS_COMPILE),)
+CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
+endif
+
+# A nifty macro to make testing gcc features easier
+check_gcc=$(shell \
+ if $(CC) $(1) -S -o /dev/null -xc /dev/null > /dev/null 2>&1; \
+ then echo "$(1)"; else echo "$(2)"; fi)
+check_as=$(shell \
+ if $(CC) -Wa,$(1) -Wa,-Z -c -o /dev/null -xassembler /dev/null > /dev/null 2>&1; \
+ then echo "-Wa,$(1)"; fi)
+check_ld=$(shell \
+ if $(CC) $(LDFLAG-fuse-ld) $(CFLAG_-Wl--no-warn-mismatch) -Wl,$(1) $(CFLAG_-nostdlib) -o /dev/null -Wl,-b,binary /dev/null > /dev/null 2>&1; \
+ then echo "$(1)"; fi)
+
+# Use variable indirection here so that we can have variable
+# names with fun chars in them like equal signs
+define check-tool-var
+ifeq ($(filter $(clean_targets) CLEAN_%,$(MAKECMDGOALS)),)
+_v = $(2)_$(3)
+ifndef $$(_v)
+$$(_v) := $$(call $(1),$(subst %, ,$(3)))
+export $$(_v)
+endif
+endif
+endef
+
+# Usage: check-gcc-var,<flag>
+# Check the C compiler to see if it supports <flag>.
+# Export the variable CFLAG_<flag> if it does.
+define check-gcc-var
+$(call check-tool-var,check_gcc,CFLAG,$(1))
+endef
+# Usage: check-as-var,<flag>
+# Check the assembler to see if it supports <flag>. Export the
+# variable ASFLAG_<flag> if it does (for invoking the assembler),
+# as well CFLAG_-Wa<flag> (for invoking the compiler driver).
+define check-as-var
+$(call check-tool-var,check_as,ASFLAG,$(1))
+_v = CFLAG_-Wa$(1)
+export $$(_v) = $$(if $$(ASFLAG_$(1)),-Wa$$(comma)$$(ASFLAG_$(1)))
+endef
+# Usage: check-ld-var,<flag>
+# Check the linker to see if it supports <flag>. Export the
+# variable LDFLAG_<flag> if it does (for invoking the linker),
+# as well CFLAG_-Wl<flag> (for invoking the compiler driver).
+define check-ld-var
+$(call check-tool-var,check_ld,LDFLAG,$(1))
+_v = CFLAG_-Wl$(1)
+export $$(_v) = $$(if $$(LDFLAG_$(1)),-Wl$$(comma)$$(LDFLAG_$(1)))
+endef
+# Usage: cache-output-var,<variable>,<shell command>
+# Execute <shell command> and cache the output in <variable>.
+define cache-output-var
+ifndef $(1)
+$(1) := $$(shell $(2))
+export $(1)
+endif
+endef
+
+
+ARFLAGS:=cr
+
+ifneq ($(strip $(UCLIBC_EXTRA_CFLAGS)),"")
+CFLAGS += $(call qstrip,$(UCLIBC_EXTRA_CFLAGS))
+endif
+ifneq ($(strip $(UCLIBC_EXTRA_LDFLAGS)),"")
+LDFLAGS += $(call qstrip,$(UCLIBC_EXTRA_LDFLAGS))
+endif