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+# Makefile fragment for building toolchain with crosstool-NG
+
+# As a reference, you can look at toolchain/toolchain-external/ext-tool.mk
+# for a generic approach to external toolchains.
+# crosstool-NG as a backend is but a kind of external toolchains,
+# except that it is not pre-built.
+
+#-----------------------------------------------------------------------------
+# 'uclibc' is the target to depend on to get the toolchain and prepare
+# the staging directory and co.
+uclibc: dependencies $(STAMP_DIR)/ct-ng-toolchain-installed
+
+#-----------------------------------------------------------------------------
+# Internal variables
+
+# Crostool-NG hard-coded configuration options
+CTNG_VERSION:=1.8.0
+CTNG_SITE:=http://ymorin.is-a-geek.org/download/crosstool-ng/
+CTNG_SOURCE:=crosstool-ng-$(CTNG_VERSION).tar.bz2
+CTNG_DIR:=$(BUILD_DIR)/crosstool-ng-$(CTNG_VERSION)
+CTNG_CAT:=bzcat
+CTNG_PATCH_DIR:=toolchain/toolchain-crosstool-ng
+CTNG_CONFIG_FILE:=$(call qstrip,$(BR2_TOOLCHAIN_CTNG_CONFIG))
+CTNG_UCLIBC_CONFIG_FILE := $(TOPDIR)/toolchain/toolchain-crosstool-ng/uClibc.config
+
+# Hack! ct-ng is in fact a Makefile script. As such, it accepts all
+# make options, such as -C, which makes it uneeded to chdir prior
+# to calling ct-ng.
+# $1: the set of arguments to pass to ct-ng
+define ctng
+$(CTNG_DIR)/ct-ng -C $(CTNG_DIR) --no-print-directory $(1)
+endef
+
+#-----------------------------------------------------------------------------
+# Installing the libs to target/ and staging/
+
+#--------------
+# The generic system libraries (in /lib)
+CTNG_LIBS_LIB := libc.so libcrypt.so libdl.so libgcc_s.so libm.so libnsl.so libpthread.so libresolv.so librt.so libutil.so
+
+#--------------
+# The libc-specific system libraries (in /lib)
+# Note: it may be needed to tweak the NSS libs in the glibc and eglibc cases...
+CTNG_LIBS_uClibc := ld-uClibc.so
+CTNG_LIBS_glibc := ld-linux.so libnss_files.so libnss_dns.so
+CTNG_LIBS_eglibc := $(CTNG_LIBS_glibc)
+
+#--------------
+# All that we need in /lib
+CTNG_LIBS_LIB += $(CTNG_LIBS_$(call qstrip,$(BR2_TOOLCHAIN_CTNG_LIBC)))
+
+#--------------
+# All that we need in /usr/lib
+ifneq ($(BR2_INSTALL_LIBSTDCPP),)
+CTNG_LIBS_USR_LIB += libstdc++.so
+endif
+
+#--------------
+# Actual copy
+$(STAMP_DIR)/ct-ng-toolchain-installed: $(STAMP_DIR)/ct-ng-toolchain-built
+ $(Q)mkdir -p $(TARGET_DIR)/lib
+ $(Q)CTNG_TUPLE="$$( $(call ctng,show-tuple) )"; \
+ CTNG_SYSROOT="$(TOOLCHAIN_DIR)/$${CTNG_TUPLE}/sys-root"; \
+ echo "CTNG_TUPLE='$${CTNG_TUPLE}'"; \
+ echo "CTNG_SYSROOT='$${CTNG_SYSROOT}'"; \
+ echo "Copy external toolchain libraries to target..."; \
+ for libs in $(CTNG_LIBS_LIB); do \
+ $(call copy_toolchain_lib_root,$${CTNG_SYSROOT},$$libs,/lib,$(BR2_TOOLCHAIN_CTNG_STRIP_LIBS)); \
+ done; \
+ for libs in $(CTNG_LIBS_USR_LIB); do \
+ $(call copy_toolchain_lib_root,$${CTNG_SYSROOT},$$libs,/usr/lib,$(BR2_TOOLCHAIN_CTNG_STRIP_LIBS)); \
+ done; \
+ echo "Copy external toolchain sysroot to staging..."; \
+ $(call copy_toolchain_sysroot,$${CTNG_SYSROOT},$${CTNG_SYSROOT},)
+ $(Q)touch $@
+
+#-----------------------------------------------------------------------------
+# Building the toolchain
+
+$(STAMP_DIR)/ct-ng-toolchain-built: $(CTNG_DIR)/.config
+ $(Q)$(call ctng,build.$(BR2_JLEVEL))
+ $(Q)printf "\n"
+ $(Q)touch $@
+
+#-----------------------------------------------------------------------------
+# Configuring the toolchain
+
+# Note: a lot of the following tricks would become unneeded if one day
+# buildroot and crosstool-NG had matching options, especially for the
+# target description: arch name, bitness, endianness...
+
+# Note-2: missing conformity check between BR's .config and libc features.
+# Use check_uclibc or check_glibc.
+
+#--------------
+# Massage BR2_ARCH so that it matches CT-NG's ARCH
+# Defaults:
+CTNG_ARCH := $(CTNG_BR2_ARCH)
+CTNG_ENDIAN :=
+CTNG_BIT :=
+# Architecture overides, only overide pertinent vars:
+ifeq ($(BR2_arm),y)
+CTNG_ARCH := arm
+CTNG_ENDIAN := LE
+else ifeq ($(BR2_armeb),y)
+CTNG_ARCH := arm
+CTNG_ENDIAN := BE
+else ifeq ($(BR2_i386),y)
+CTNG_ARCH := x86
+CTNG_BIT := 32
+else ifeq ($(BR2_mips),y)
+CTNG_ARCH := mips
+CTNG_ENDIAN := BE
+else ifeq ($(BR2_mipsel),y)
+CTNG_ARCH := mips
+CTNG_ENDIAN := LE
+else ifeq ($(BR2_powerpc),y)
+CTNG_BIT := 32
+else ifeq ($(BR2_x86_64),y)
+CTNG_ARCH := x86
+CTNG_BIT := 64
+# Add other architecture overides below:
+# - keep alphabetic order
+# - duplicate next 4 lines, and uncomment
+# else ifeq ($(BR2_<arch_name_here>),y)
+# CTNG_ARCH :=
+# CTNG_ENDIAN :=
+# CTNG_BIT :=
+# - remove unneeded vars
+# - add BR arch-name on ifeq line
+# - fill-in required CTNG_* vars
+endif
+
+#--------------
+# Massage BR options into CTNG .config file
+# CT_ARCH : handled by the backend mechanism
+# CT_ARCH_[BL]E : endianness
+# CT_ARCH_(32|64) : bitness
+# CT_PREFIX_DIR : install into BR's toolchain dir
+# CT_INSTALL_DIR_RO : do *not* chmod a-w the toolchain dir
+# CT_LOCAL_TARBALLS_DIR : share downloads with BR
+# CT_SYSROOT_DIR_PREFIX : no prefix needed, really
+# CT_TARGET_VENDOR : try to set a unique vendor string, to avoid clashing with BR's vendor string
+# CT_TARGET_ALIAS : set the target tuple alias to REAL_GNU_TARGET_NAME so that packages' ./configure find the compiler
+# CT_DEBUG_gdb : deselect gdb+gdbserver if buildroot builds its own
+# CT_CC_LANG_CXX : required if we copy libstdc++.so, and build C++
+# CT_LIBC_UCLIBC_CONFIG_FILE: uClibc config file, if needed
+#
+# Lots of other awfull sed manipulations go here, to override CT-NG's .config
+# with BR2 config options.
+# Known missing: arch variant & options, floating point (HW/SW), uClibc/eglibc config...
+#
+
+CTNG_FIX_DOT_CONFIG_SED :=
+CTNG_FIX_DOT_CONFIG_SED += s:^(CT_INSTALL_DIR_RO)=y:\# \1 is not set:;
+CTNG_FIX_DOT_CONFIG_SED += s:^(|\# )(CT_ARCH_[BL]E).*:\# \2 is not set:;
+CTNG_FIX_DOT_CONFIG_SED += s:^\# (CT_ARCH_$(CTNG_ENDIAN)) is not set:\1=y:;
+CTNG_FIX_DOT_CONFIG_SED += s:^(|\# )(CT_ARCH_(32|64)).*:\# \2 is not set:;
+CTNG_FIX_DOT_CONFIG_SED += s:^\# (CT_ARCH_$(CTNG_BIT)) is not set:\1=y:;
+CTNG_FIX_DOT_CONFIG_SED += s:^\# (CT_ARCH_USE_MMU) is not set:\1=y:;
+CTNG_FIX_DOT_CONFIG_SED += s:^(CT_TARGET_VENDOR)=.*:\1="buildroot_ctng":;
+CTNG_FIX_DOT_CONFIG_SED += s:^(CT_TARGET_ALIAS)=.*:\1="$(REAL_GNU_TARGET_NAME)":;
+CTNG_FIX_DOT_CONFIG_SED += s:^(CT_CC_PKGVERSION)="(.*)":\1="crosstool-NG $(CTNG_VERSION) - buildroot $(call qstrip,$(BR2_VERSION))":;
+ifneq ($(call qstrip,$(BR2_PACKAGE_GDB_SERVER))$(call qstrip,$(BR2_PACKAGE_GDB_HOST)),)
+CTNG_FIX_DOT_CONFIG_SED += s:^(CT_DEBUG_gdb)=.*:\# \1 is not set:;
+endif
+ifneq ($(call qstrip,$(BR2_INSTALL_LIBSTDCPP)),)
+CTNG_FIX_DOT_CONFIG_SED += s:^\# (CT_CC_LANG_CXX) is not set:\1=y:;
+else
+CTNG_FIX_DOT_CONFIG_SED += s:^(CT_CC_LANG_CXX)=.*:\# \1 is not set:;
+endif
+
+#--------------
+# And the specials for paths
+CTNG_FIX_DOT_CONFIG_PATHS_SED :=
+CTNG_FIX_DOT_CONFIG_PATHS_SED += s:^(CT_PREFIX_DIR)=.*:\1="$(TOOLCHAIN_DIR)":;
+CTNG_FIX_DOT_CONFIG_PATHS_SED += s:^(CT_LOCAL_TARBALLS_DIR)=.*:\1="$(DL_DIR)":;
+CTNG_FIX_DOT_CONFIG_PATHS_SED += s:^(CT_SYSROOT_DIR_PREFIX)=.*:\1="":;
+ifeq ($(BR2_TOOLCHAIN_CTNG_uClibc),y)
+CTNG_FIX_DOT_CONFIG_PATHS_SED += s:^(CT_LIBC_UCLIBC_CONFIG_FILE)=.*:\1="$(CTNG_UCLIBC_CONFIG_FILE)":;
+endif
+
+#--------------
+# Small functions to shoe-horn the above into crosstool-NG's .config
+# $1: the .config file to munge
+# $2: the sed expression to apply
+define ctng-fix-dot-config
+ $(Q)sed -r -e '$(2)' $(1) >$(1).sed
+ $(Q)cmp $(1) $(1).sed >/dev/null 2>&1 && rm -f $(1).sed || mv -f $(1).sed $(1)
+endef
+
+# Function to update the .config
+# We first munge the .config to shoe-horn defaults, then we push that unto
+# crosstool-NG's oldconfig process, to sort out wizy-wazy deps, and then we
+# shoe-horn paths again, as they get ripped-out by oldconfig (is that a bug
+# or a feature of kconfig?)
+# $1: the .config file to munge
+define ctng-oldconfig
+ $(call ctng-fix-dot-config,$(1),$(CTNG_FIX_DOT_CONFIG_SED))
+ $(Q)yes '' |\
+ $(call ctng,CT_IS_A_BACKEND=y \
+ CT_BACKEND_ARCH=$(CTNG_ARCH) \
+ CT_BACKEND_KERNEL=linux \
+ CT_BACKEND_LIBC=$(BR2_TOOLCHAIN_CTNG_LIBC) \
+ oldconfig )
+ $(call ctng-fix-dot-config,$(1),$(CTNG_FIX_DOT_CONFIG_PATHS_SED))
+endef
+
+# This function checks the confguration of the toolchain did actually change
+# If not changed, then current .config will be touched with reference to the
+# stamp file. If the configuration did change, nothing is done.
+# $1: the current .config to check
+# $2: the time-stamped .config file
+define ctng-check-config-changed
+ $(Q)old_md5="$$( grep -v -E '^(#|$$)' $(2) 2>/dev/null \
+ |md5sum \
+ |cut -d ' ' -f 1 \
+ )"; \
+ new_md5="$$( grep -v -E '^(#|$$)' $(1) 2>/dev/null \
+ |md5sum \
+ |cut -d ' ' -f 1 \
+ )"; \
+ if [ $${old_md5} = $${new_md5} -a -f $(2) ]; then \
+ touch -r $(2) $(1); \
+ fi
+endef
+
+# Default configuration
+# Depends on top-level .config because it has options we have to shoe-horn
+# into crosstool-NG's .config
+# Only copy the original .config file if we don't have one already
+$(CTNG_DIR)/.config: $(CTNG_CONFIG_FILE) $(CTNG_DIR)/ct-ng $(CONFIG_DIR)/.config
+ $(Q)[ -f $@ ] && cp -a $@ $@.timestamp || cp -f $< $@
+ $(call ctng-oldconfig,$@)
+ $(call ctng-check-config-changed,$@,$@.timestamp)
+ $(Q)rm -f $@.timestamp
+
+# Manual configuration
+ctng-menuconfig: $(CTNG_DIR)/.config
+ $(Q)cp -a $< $<.timestamp
+ $(Q)$(call ctng,CT_IS_A_BACKEND=y \
+ CT_BACKEND_ARCH=$(CTNG_ARCH) \
+ CT_BACKEND_KERNEL=linux \
+ CT_BACKEND_LIBC=$(BR2_TOOLCHAIN_CTNG_LIBC) \
+ menuconfig )
+ $(call ctng-oldconfig,$<)
+ $(call ctng-check-config-changed,$<,$<.timestamp)
+ $(Q)rm -f $<.timestamp
+
+#-----------------------------------------------------------------------------
+# Retrieving, configuring and building crosstool-NG (as a package)
+
+$(DL_DIR)/$(CTNG_SOURCE):
+ $(Q)$(call DOWNLOAD,$(CTNG_SITE),$(CTNG_SOURCE))
+
+$(CTNG_DIR)/.unpacked: $(DL_DIR)/$(CTNG_SOURCE)
+ $(Q)rm -rf $(CTNG_DIR)
+ $(Q)mkdir -p $(BUILD_DIR)
+ $(Q)$(CTNG_CAT) $(DL_DIR)/$(CTNG_SOURCE) |tar -C $(BUILD_DIR) $(TAR_OPTIONS) -
+ $(Q)touch $@
+
+$(CTNG_DIR)/.patched: $(CTNG_DIR)/.unpacked
+ $(Q)toolchain/patch-kernel.sh $(CTNG_DIR) \
+ $(CTNG_PATCH_DIR) \
+ \*.patch \
+ \*.patch.$(ARCH)
+ $(Q)touch $@
+
+$(CTNG_DIR)/.configured: $(CTNG_DIR)/.patched
+ $(Q)cd $(CTNG_DIR) && ./configure --local
+ $(Q)touch $@
+
+$(CTNG_DIR)/ct-ng: $(CTNG_DIR)/.configured
+ $(Q)$(MAKE) -C $(CTNG_DIR) --no-print-directory
+ $(Q)touch $@