genode/tool/tool_chain

#!/usr/bin/make -f
#
# \brief  Tool-chain creation tool for the Genode OS Framework
# \author Norman Feske
# \date   2009-02-03
#

help:
	$(ECHO)
	$(ECHO) "Build tool chain for the Genode OS Framework"
	$(ECHO)
	$(ECHO) "The tool chain consists of GCC $(GCC_VERSION) and binutils $(BINUTILS_VERSION)"
	$(ECHO) "and will be created at '$(LOCAL_INSTALL_LOCATION)'."
	$(ECHO)
	$(ECHO) "--- available commands ---"
	$(ECHO) "x86         - create tool chain for x86"
	$(ECHO) "arm         - create tool chain for arm"
	$(ECHO) "aarch64     - create tool chain for aarch64/arm64"
	$(ECHO) "riscv       - create tool chain for riscv"
	$(ECHO) "clean       - clean everything except downloaded archives"
	$(ECHO) "cleanall    - clean everything including downloaded archives"
	$(ECHO)
	$(ECHO) "--- available command line options ---"
	$(ECHO) "MAKE_JOBS=...        - number of parallel make jobs (default: 4)"
	$(ECHO) "BUILD_LOCATION=...   - build location (default: $(DEFAULT_BUILD_LOCATION))"
	$(ECHO) "INSTALL_LOCATION=... - install location (default: $(DEFAULT_INSTALL_LOCATION))"
	$(ECHO) "SUDO=...             - name of sudo command, leave empty to not use sudo (default: sudo)"
	$(ECHO)

#
# User interface
#

SUPPORTED_PLATFORMS := x86 arm riscv aarch64

PLATFORM := $(firstword $(filter $(SUPPORTED_PLATFORMS),$(MAKECMDGOALS)))

$(SUPPORTED_PLATFORMS): install

#
# Enable parallel build for 2nd-level $(MAKE) by default
#

MAKE_JOBS ?= 4

#
# Determine Genode base directory based on the known location of the
# 'tool_chain' tool within the Genode source tree
#

GENODE_DIR ?= $(realpath $(dir $(firstword $(MAKEFILE_LIST)))/..)

#
# version numbers
#

TOOL_CHAIN_VERSION = 19.05
GCC_VERSION        = 8.3.0
BINUTILS_VERSION   = 2.32

#
# locations
#

DEFAULT_BUILD_LOCATION   = $(GENODE_DIR)/build/tool_chain-$(TOOL_CHAIN_VERSION)
DEFAULT_INSTALL_LOCATION = /usr/local/genode/tool/$(TOOL_CHAIN_VERSION)

BUILD_LOCATION   ?= $(DEFAULT_BUILD_LOCATION)
INSTALL_LOCATION ?= $(DEFAULT_INSTALL_LOCATION)

#
# Utilities
#

##
# Return $(2) if $(1) is empty, "" else
#
check_nonempty_f = $(if $(1),,$(info $(2))$(2))

##
# Return $(3) if $(1) != $(2), "" else
#
check_equal_f = $(if $(filter $(1),$(2)),,$(info $(3))$(3))


SHELL        = bash
BRIGHT_COL   = \033[01;33m
DEFAULT_COL  = \033[0m
ECHO         = @echo -e
VERBOSE     ?= @
SUDO        ?= sudo

#
# Check if 'autoconf' is installed
#
AUTOCONF_VERSION = 2.64

AUTOCONF_VERSION_STRING = "autoconf (GNU Autoconf) $(AUTOCONF_VERSION)"
ifeq ($(shell autoconf -V | grep $(AUTOCONF_VERSION_STRING)),)
  ifeq ($(shell which autoconf$(AUTOCONF_VERSION)),)
    ifneq ($(shell which autoconf-$(AUTOCONF_VERSION)),)
      AUTOCONF = autoconf-$(AUTOCONF_VERSION)
    endif
  else
    AUTOCONF = autoconf$(AUTOCONF_VERSION)
  endif
else
  AUTOCONF = autoconf
endif

AUTOCONFINST_OK = $(call check_nonempty_f,$(AUTOCONF),\
                    Need to have 'autoconf-$(AUTOCONF_VERSION)' installed.)

#
# Check if 'pkg-config' is installed
#
PKG_CONFIG_OK = $(call check_nonempty_f,$(shell which pkg-config),\
                Need to have 'pkg-config' installed.)

#
# Check if 'libncurses' is installed
#
CURSES_OK = $(call check_equal_f,\
              $(shell pkg-config --exists ncurses && echo ok),ok,\
              Need to have 'libncurses' installed.)

#
# Check if 'texinfo' is installed
#
TEXINFO_OK = $(call check_nonempty_f,$(shell which texi2pdf),\
               Need to have 'texinfo' installed.)

#
# Check if 'wget' is installed
#
WGET_OK = $(call check_nonempty_f,$(shell which wget),\
            Need to have 'wget' installed.)

#
# Check if 'autogen' is installed
#
AUTOGEN_OK = $(call check_nonempty_f,$(shell which autogen),\
               Need to have 'autogen' installed.)

#
# Check if 'gpg' is installed
#
GPG_OK = $(call check_nonempty_f,$(shell which gpg),\
           Need to have 'gpg' installed.)

#
# Check if 'libexpat' is installed
#
EXPAT_OK = $(call check_equal_f,\
             $(shell pkg-config --exists expat && echo ok),ok,\
             Need to have 'libexpat' installed.)

#
# Check if 'GNAT' is installed
#
# The '-dumpfullversion' option is used by GCC version 7, the '-dumpversion' option
# is used by GCC versions < 7.
#
HOST_GCC_VERSION := $(shell gcc -dumpfullversion -dumpversion)
GNAT_OK = $(call check_equal_f,$(shell gnatmake --version | sed -n -e 's/GNATMAKE //p'),$(HOST_GCC_VERSION),\
            Need to have GNAT installed and the GNAT version must match the GCC version (found GCC $(HOST_GCC_VERSION)).)

TOOLS_OK = $(AUTOCONF_OK) $(AUTOCONFINST_OK) $(PKG_CONFIG_OK) $(CURSES_OK) \
           $(TEXINFO_OK) $(WGET_OK) $(AUTOGEN_OK) $(GPG_OK) $(EXPAT_OK) \
           $(GNAT_OK)

ifneq ($(strip $(TOOLS_OK)),)
$(error Please install missing tools.)
endif

#
# 'configure' parameters for binutils, gcc and gdb
#

LOCAL_BOOTSTRAP_INSTALL_LOCATION = $(BUILD_LOCATION)/bootstrap/install
export PATH := $(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin:$(PATH)

LOCAL_INSTALL_LOCATION = $(BUILD_LOCATION)/install

TARGET_NAME_x86        = x86_64-pc-elf
TARGET_NAME_arm        = arm-none-eabi
TARGET_NAME_riscv      = riscv64-unknown-elf
TARGET_NAME_aarch64    = aarch64-none-elf

GCC_CONFIG_riscv       = --with-arch=rv64imac --with-abi=lp64

ifneq ($(VERBOSE),)
CONFIG_QUIET = --quiet
MAKEFLAGS   += --quiet
export MAKEFLAGS
endif

COMMON_BOOTSTRAP_CONFIG = $(CONFIG_QUIET) \
                          --prefix=$(LOCAL_BOOTSTRAP_INSTALL_LOCATION) \
                          --disable-multilib

BINUTILS_BOOTSTRAP_CONFIG += $(COMMON_BOOTSTRAP_CONFIG)

ifeq ($(PLATFORM),riscv)
LANGUAGES              = c,c++
LIB_GCC                = cd $(INSTALL_LOCATION)/lib/gcc/riscv64-unknown-elf/$(GCC_VERSION)/rv64imac/lp64 && \
                         $(SUDO) ln -sf ../../include include
else
LANGUAGES              = c,c++,ada
LIB_GCC                =
endif

GCC_BOOTSTRAP_CONFIG += $(COMMON_BOOTSTRAP_CONFIG) \
                        --enable-languages=c,c++,ada \
                        --disable-libatomic \
                        --disable-libcilkrts \
                        --disable-libgomp \
                        --disable-libitm \
                        --disable-libmpx \
                        --disable-libsanitizer \
                        --disable-libquadmath \
                        --disable-libssp \
                        --disable-lto

COMMON_CONFIG = $(CONFIG_QUIET) \
                --prefix=$(LOCAL_INSTALL_LOCATION) \
                --program-prefix=genode-$(PLATFORM)- \
                --target=$(TARGET_NAME_$(PLATFORM)) \
                --program-transform-name="s/$(TARGET_NAME_$(PLATFORM))/$(PLATFORM)/"

BINUTILS_CONFIG += $(COMMON_CONFIG) --disable-werror

#
# Prevent GNU assembler from treating '/' as the start of a comment. In
# 'gas/config/tc-i386.c', the policy of handling '/' is defined. For Linux, '/'
# is treated as division, which we expect. To apply this needed policy for our
# plain 'elf' version gas, we supply the definition of 'TE_LINUX' by hand.
# Fortunately, this define is not used outside of gas.
#
BINUTILS_CONFIG += CFLAGS=-DTE_LINUX

# Disable the generation of new relocation types introduced with binutils 2.26
# which are not recognized by older 'ld' versions. This is needed for hybrid
# Genode/Linux components on Ubuntu 14.04 with binutils 2.24.
BINUTILS_CONFIG_x86 += --disable-x86-relax-relocations

#
# Add platform-specific binutils configure arguments
#
BINUTILS_CONFIG += $(BINUTILS_CONFIG_$(PLATFORM))

#
# GDB configure arguments
#
GDB_CONFIG += $(COMMON_CONFIG) --disable-werror --disable-sim

GCC_CONFIG += $(COMMON_CONFIG) \
              --enable-languages=$(LANGUAGES),go \
              --disable-libgo \
              --disable-gotools \
              --disable-libssp \
              --disable-libquadmath \
              --disable-libffi \
              --disable-libada \
              --enable-targets=all \
              --with-gnu-as \
              --with-gnu-ld \
              --disable-tls \
              --disable-threads \
              --disable-hosted-libstdcxx \
              --enable-shared \
              --enable-multiarch \
              --disable-sjlj-exceptions \
              CFLAGS_FOR_TARGET="-I$(GENODE_DIR)/tool -DUSE_PT_GNU_EH_FRAME -Dinhibit_libc -fPIC" \
              CXXFLAGS_FOR_TARGET="-fPIC"

GCC_CONFIG += $(GCC_CONFIG_$(PLATFORM))

#
# Configure options passed to gcc
#
HOST_CONFIG_ARGS = $(CONFIG_QUIET)

#
# Passed to target components such as libgcc, libstdc++
#
TARGET_CONFIG_ARGS = $(CONFIG_QUIET)

GCC_INSTALL_RULE = install-strip

MAKE_OPT += GENODE="yes"

#
# Platform-specific multilib support
#

GCC_MAKE_OPT_x86 := MULTILIB_OPTIONS="m64/m32" MULTILIB_DIRNAMES="64 32"
GCC_MAKE_OPT += $(MAKE_OPT) $(GCC_MAKE_OPT_$(PLATFORM))

#
# Build rules and dependencies between build steps
#
# We use the binaries 'objdump' and 'g++' as representatives for expressing
# dependencies. All other programs will be generated as side effect.
#
# The 'gprbuild' tool is built from source because of a bug in the version
# that comes with Ubuntu 18.04 (fixed by commit 361d080 on github).
#

BINUTILS_BOOTSTRAP_BINARIES           = $(BUILD_LOCATION)/bootstrap/binutils/binutils/objdump
BINUTILS_BOOTSTRAP_INSTALLED_BINARIES = $(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin/objdump
GCC_BOOTSTRAP_BINARIES                = $(BUILD_LOCATION)/bootstrap/gcc/gcc/xg++
GCC_BOOTSTRAP_INSTALLED_BINARIES      = $(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin/g++
GPRBUILD_BOOTSTRAP_INSTALLED_BINARIES = $(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin/gprbuild

BINUTILS_BINARIES           = $(BUILD_LOCATION)/$(PLATFORM)/binutils/binutils/objdump
BINUTILS_INSTALLED_BINARIES = $(LOCAL_INSTALL_LOCATION)/bin/genode-$(PLATFORM)-objdump
GCC_BINARIES                = $(BUILD_LOCATION)/$(PLATFORM)/gcc/gcc/g++-cross
GCC_INSTALLED_BINARIES      = $(LOCAL_INSTALL_LOCATION)/bin/genode-$(PLATFORM)-g++
GDB_BINARIES                = $(BUILD_LOCATION)/$(PLATFORM)/gdb/gdb/gdb
GDB_INSTALLED_BINARIES      = $(LOCAL_INSTALL_LOCATION)/bin/genode-$(PLATFORM)-gdb
ALI2DEP_BINARY              = $(BUILD_LOCATION)/ali2dep/ali2dep
ALI2DEP_INSTALLED_BINARY    = $(LOCAL_INSTALL_LOCATION)/bin/genode-$(PLATFORM)-ali2dep

build_all: $(GCC_INSTALLED_BINARIES) $(GDB_INSTALLED_BINARIES) $(ALI2DEP_INSTALLED_BINARY)

GCC_CONTRIB_DIR = $(shell $(GENODE_DIR)/tool/ports/current gcc)/src/noux-pkg/gcc

$(GCC_CONTRIB_DIR)/configure:
	$(ECHO) "$(BRIGHT_COL)preparing gcc...$(DEFAULT_COL)"
	$(VERBOSE)$(GENODE_DIR)/tool/ports/prepare_port gcc

BINUTILS_CONTRIB_DIR = $(shell $(GENODE_DIR)/tool/ports/current binutils)/src/noux-pkg/binutils

$(BINUTILS_CONTRIB_DIR)/configure:
	$(ECHO) "$(BRIGHT_COL)preparing binutils...$(DEFAULT_COL)"
	$(VERBOSE)$(GENODE_DIR)/tool/ports/prepare_port binutils

$(BUILD_LOCATION)/bootstrap/binutils/Makefile: $(BINUTILS_CONTRIB_DIR)/configure
	$(ECHO) "$(BRIGHT_COL)configuring bootstrap binutils...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); $(BINUTILS_CONTRIB_DIR)/configure $(BINUTILS_BOOTSTRAP_CONFIG)

$(BINUTILS_BOOTSTRAP_BINARIES): $(BUILD_LOCATION)/bootstrap/binutils/Makefile
	$(ECHO) "$(BRIGHT_COL)building bootstrap binutils...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) -j$(MAKE_JOBS)

$(BINUTILS_BOOTSTRAP_INSTALLED_BINARIES): $(BINUTILS_BOOTSTRAP_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing bootstrap binutils...$(DEFAULT_COL)"
	$(VERBOSE)for i in binutils gas ld intl opcodes; do \
		$(MAKE) -C $(BUILD_LOCATION)/bootstrap/binutils/$$i install-strip; done
	$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/bootstrap/binutils/libiberty install

$(BUILD_LOCATION)/$(PLATFORM)/binutils/Makefile: $(BINUTILS_CONTRIB_DIR)/configure \
                                     $(GCC_BOOTSTRAP_INSTALLED_BINARIES)
	$(ECHO) "$(BRIGHT_COL)configuring binutils...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); $(BINUTILS_CONTRIB_DIR)/configure $(BINUTILS_CONFIG)

$(BINUTILS_BINARIES): $(BUILD_LOCATION)/$(PLATFORM)/binutils/Makefile
	$(ECHO) "$(BRIGHT_COL)building binutils...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) $(MAKE_OPT) -j$(MAKE_JOBS)

$(BINUTILS_INSTALLED_BINARIES): $(BINUTILS_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing binutils...$(DEFAULT_COL)"
	$(VERBOSE)for i in binutils gas ld intl opcodes; do \
		$(MAKE) -C $(BUILD_LOCATION)/$(PLATFORM)/binutils/$$i install-strip $(MAKE_OPT); done
	$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/$(PLATFORM)/binutils/libiberty install $(MAKE_OPT)

$(BUILD_LOCATION)/bootstrap/gcc/Makefile: $(GCC_CONTRIB_DIR)/configure \
                                          $(BINUTILS_BOOTSTRAP_INSTALLED_BINARIES)

$(BUILD_LOCATION)/bootstrap/gcc/Makefile:
	$(ECHO) "$(BRIGHT_COL)configuring bootstrap gcc...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); $(GCC_CONTRIB_DIR)/configure $(GCC_BOOTSTRAP_CONFIG)

$(GCC_BOOTSTRAP_BINARIES): $(BUILD_LOCATION)/bootstrap/gcc/Makefile
	$(ECHO) "$(BRIGHT_COL)building bootstrap gcc...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) -j$(MAKE_JOBS)

$(GCC_BOOTSTRAP_INSTALLED_BINARIES): $(GCC_BOOTSTRAP_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing bootstrap gcc...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/bootstrap/gcc $(GCC_INSTALL_RULE)

$(BUILD_LOCATION)/$(PLATFORM)/gcc/Makefile: $(GCC_CONTRIB_DIR)/configure \
                                            $(BINUTILS_INSTALLED_BINARIES)

$(BUILD_LOCATION)/$(PLATFORM)/gcc/Makefile:
	$(ECHO) "$(BRIGHT_COL)configuring gcc...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); \
		host_configargs="$(HOST_CONFIG_ARGS)" \
		target_configargs="$(TARGET_CONFIG_ARGS)" \
		$(GCC_CONTRIB_DIR)/configure $(GCC_CONFIG)

$(GCC_BINARIES): $(BUILD_LOCATION)/$(PLATFORM)/gcc/Makefile

$(GCC_BINARIES):
	$(ECHO) "$(BRIGHT_COL)building gcc...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) $(GCC_MAKE_OPT) -j$(MAKE_JOBS)

$(GCC_INSTALLED_BINARIES): $(GCC_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing gcc...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/$(PLATFORM)/gcc $(GCC_INSTALL_RULE) $(GCC_MAKE_OPT)

GDB_CONTRIB_DIR = $(shell $(GENODE_DIR)/tool/ports/current gdb)/src/noux-pkg/gdb

$(GDB_CONTRIB_DIR)/configure:
	$(ECHO) "$(BRIGHT_COL)preparing gdb...$(DEFAULT_COL)"
	$(VERBOSE)$(GENODE_DIR)/tool/ports/prepare_port gdb

$(BUILD_LOCATION)/$(PLATFORM)/gdb/Makefile: $(GDB_CONTRIB_DIR)/configure
	$(ECHO) "$(BRIGHT_COL)configuring gdb...$(DEFAULT_COL)"
	$(VERBOSE)mkdir -p $(dir $@)
	$(VERBOSE)cd $(dir $@); \
		$(GDB_CONTRIB_DIR)/configure $(GDB_CONFIG)

$(GDB_BINARIES): $(BUILD_LOCATION)/$(PLATFORM)/gdb/Makefile
	$(ECHO) "$(BRIGHT_COL)building gdb...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(dir $<) $(MAKE_OPT) -j$(MAKE_JOBS)

$(GDB_INSTALLED_BINARIES): $(GDB_BINARIES)
	$(ECHO) "$(BRIGHT_COL)installing gdb...$(DEFAULT_COL)"
	$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/$(PLATFORM)/gdb install $(MAKE_OPT) MAKEINFO=true
	$(VEBOSE)strip $@


$(BUILD_LOCATION)/bootstrap/gprbuild/Makefile:
	$(ECHO) "$(BRIGHT_COL)preparing bootstrap gprbuild...$(DEFAULT_COL)"
	$(VERBOSE)git clone -b v21.0.0 https://github.com/AdaCore/gprbuild.git $(dir $@)
	$(VERBOSE)git clone -b v21.0.0 https://github.com/AdaCore/xmlada.git $(dir $@)/xmlada
	$(VERBOSE)git clone -b v21.0.0 https://github.com/AdaCore/gprconfig_kb.git $(dir $@)/gprconfig_kb
	$(VERBOSE)sed -i -e '/\<target name="\^\.\*-gnueabihf$$" \/>/d' $(dir $@)/gprconfig_kb/db/linker.xml
	$(VERBOSE)sed -i -e '/\<target name="\^\.\*-linux\.\*" \/>/d' $(dir $@)/gprconfig_kb/db/linker.xml

$(GPRBUILD_BOOTSTRAP_INSTALLED_BINARIES): $(BUILD_LOCATION)/bootstrap/gprbuild/Makefile $(GCC_BOOTSTRAP_INSTALLED_BINARIES)
	$(ECHO) "$(BRIGHT_COL)building bootstrap gprbuild...$(DEFAULT_COL)"
	$(VERBOSE)cd $(dir $<); CC=$(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin/gcc ./bootstrap.sh \
	          --with-xmlada=./xmlada --with-kb=./gprconfig_kb --prefix=$(LOCAL_BOOTSTRAP_INSTALL_LOCATION)


$(BUILD_LOCATION)/ali2dep/build/build.gpr:
	$(ECHO) "$(BRIGHT_COL)preparing ali2dep...$(DEFAULT_COL)"
	$(VERBOSE)git clone https://github.com/Componolit/ali2dep.git $(BUILD_LOCATION)/ali2dep
	$(VERBOSE)sed -i -e '/Create_Missing_Dirs/d' $@

$(ALI2DEP_BINARY): $(GCC_BOOTSTRAP_INSTALLED_BINARIES) $(GPRBUILD_BOOTSTRAP_INSTALLED_BINARIES) $(BUILD_LOCATION)/ali2dep/build/build.gpr
	$(ECHO) "$(BRIGHT_COL)building ali2dep...$(DEFAULT_COL)"
	$(VERBOSE)$(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin/gprconfig --batch --target=all \
	          --config=Ada,,default,$(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin,GNAT \
	          --config=C,,,$(LOCAL_BOOTSTRAP_INSTALL_LOCATION)/bin/,GCC \
	          -o $(BUILD_LOCATION)/ali2dep/genode_bootstrap_tool_chain.cgpr
	$(VERBOSE)GPRBUILD_ARGS="--config=genode_bootstrap_tool_chain.cgpr" $(MAKE) -C $(BUILD_LOCATION)/ali2dep

$(ALI2DEP_INSTALLED_BINARY): $(ALI2DEP_BINARY)
	$(ECHO) "$(BRIGHT_COL)installing ali2dep...$(DEFAULT_COL)"
	$(VERBOSE)strip -o $@ $<

#
# Clean rules
#

clean:
	rm -rf $(BUILD_LOCATION)

cleanall: clean

#
# Install rules
#

install: build_all
	$(ECHO) "$(BRIGHT_COL)installing tool chain to '$(INSTALL_LOCATION)'...$(DEFAULT_COL)"
	$(VERBOSE)$(SUDO) mkdir -p $(INSTALL_LOCATION)
	$(VERBOSE)$(SUDO) cp -a --remove-destination --no-target-directory $(LOCAL_INSTALL_LOCATION) $(INSTALL_LOCATION)
	$(VERBOSE)$(LIB_GCC)
ifeq ($(INSTALL_LOCATION),$(DEFAULT_INSTALL_LOCATION))
	$(VERBOSE)$(SUDO) ln -snf $(TOOL_CHAIN_VERSION) $(dir $(INSTALL_LOCATION))/current
endif