#!/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)"
$(ECHO) "ENABLE_FEATURES=... - features to enable (default: \"$(ENABLE_FEATURES)\")"
$(ECHO)
#
# User interface
#
SUPPORTED_PLATFORMS := x86 arm riscv aarch64
ENABLE_FEATURES ?= c c++ ada go gdb
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 = 21.05
GCC_VERSION = 10.3.0
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 'flex' is installed
#
FLEX_OK = $(call check_nonempty_f,$(shell which flex),\
Need to have 'flex' installed.)
#
# Check if 'bison' is installed
#
BISON_OK = $(call check_nonempty_f,$(shell which bison),\
Need to have 'bison' installed.)
#
# Check if 'g++' is installed
#
GXX_OK = $(call check_nonempty_f,$(shell which g++),\
Need to have 'g++' 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,\
$(call check_equal_f,\
$(shell pkg-config --exists ncursesw && 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 '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 = $(FLEX_OK) $(BISON_OK) $(GXX_OK) $(PKG_CONFIG_OK) $(CURSES_OK) \
$(TEXINFO_OK) $(EXPAT_OK)
ifneq ($(filter ada,$(ENABLE_FEATURES)),)
TOOLS_OK += $(GNAT_OK) $(GPRBUILD_OK)
endif
ifneq ($(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
INSTALL_riscv = cd $(INSTALL_LOCATION)/lib/gcc/riscv64-unknown-elf/$(GCC_VERSION)/rv64imac/lp64 && \
$(SUDO) ln -sf ../../include include
ifneq ($(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)
LANGUAGES := $(filter-out gdb, $(ENABLE_FEATURES))
LANGUAGES := $(shell echo "${LANGUAGES}" | sed -e 's/ /,/g')
ifeq ($(filter ada,$(ENABLE_FEATURES)),)
ALI2DEP_INSTALLED_BINARY =
endif
ifeq ($(filter gdb,$(ENABLE_FEATURES)),)
GDB_INSTALLED_BINARIES =
endif
GCC_BOOTSTRAP_CONFIG += $(COMMON_BOOTSTRAP_CONFIG) \
--enable-languages=$(filter-out go,$(LANGUAGES)) \
--disable-libgo \
--disable-gotools \
--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) \
--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)
# prepare all ports first to detect more missing tools early
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
PREPARED_BINUTILS = $(BINUTILS_CONTRIB_DIR)/configure
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
PREPARED_GCC = $(GCC_CONTRIB_DIR)/configure
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
PREPARED_GDB = $(GDB_CONTRIB_DIR)/configure
PREPARED_PORTS = $(PREPARED_BINUTILS) $(PREPARED_GCC) $(PREPARED_GDB)
# bootstrap binutils
$(BUILD_LOCATION)/bootstrap/binutils/Makefile: $(BINUTILS_CONTRIB_DIR)/configure $(PREPARED_PORTS)
$(ECHO) "$(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/$$i install-strip; done
$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/bootstrap/binutils/libiberty install
# bootstrap gcc
$(BUILD_LOCATION)/bootstrap/gcc/Makefile: $(GCC_CONTRIB_DIR)/configure \
$(BINUTILS_BOOTSTRAP_INSTALLED_BINARIES)
$(BUILD_LOCATION)/bootstrap/gcc/Makefile:
$(ECHO) "$(BRIGHT_COL)configuring bootstrap gcc...$(DEFAULT_COL)"
$(VERBOSE)mkdir -p $(dir $@)
$(VERBOSE)cd $(dir $@); $(GCC_CONTRIB_DIR)/configure $(GCC_BOOTSTRAP_CONFIG)
$(GCC_BOOTSTRAP_BINARIES): $(BUILD_LOCATION)/bootstrap/gcc/Makefile
$(ECHO) "$(BRIGHT_COL)building bootstrap gcc...$(DEFAULT_COL)"
$(VERBOSE)$(MAKE) -C $(dir $<) -j$(MAKE_JOBS)
$(GCC_BOOTSTRAP_INSTALLED_BINARIES): $(GCC_BOOTSTRAP_BINARIES)
$(ECHO) "$(BRIGHT_COL)installing bootstrap gcc...$(DEFAULT_COL)"
$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/bootstrap/gcc $(GCC_INSTALL_RULE)
# binutils
$(BUILD_LOCATION)/$(PLATFORM)/binutils/Makefile: $(BINUTILS_CONTRIB_DIR)/configure \
$(GCC_BOOTSTRAP_INSTALLED_BINARIES)
$(ECHO) "$(BRIGHT_COL)configuring binutils...$(DEFAULT_COL)"
$(VERBOSE)mkdir -p $(dir $@)
$(VERBOSE)cd $(dir $@); $(BINUTILS_CONTRIB_DIR)/configure $(BINUTILS_CONFIG)
$(BINUTILS_BINARIES): $(BUILD_LOCATION)/$(PLATFORM)/binutils/Makefile
$(ECHO) "$(BRIGHT_COL)building binutils...$(DEFAULT_COL)"
$(VERBOSE)$(MAKE) -C $(dir $<) $(MAKE_OPT) -j$(MAKE_JOBS)
$(BINUTILS_INSTALLED_BINARIES): $(BINUTILS_BINARIES)
$(ECHO) "$(BRIGHT_COL)installing binutils...$(DEFAULT_COL)"
$(VERBOSE)for i in binutils gas ld intl opcodes; do \
$(MAKE) -C $(BUILD_LOCATION)/$(PLATFORM)/binutils/$$i install-strip $(MAKE_OPT); done
$(VERBOSE)$(MAKE) -C $(BUILD_LOCATION)/$(PLATFORM)/binutils/libiberty install $(MAKE_OPT)
# gcc
$(BUILD_LOCATION)/$(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
$(BUILD_LOCATION)/$(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 $@
# gprbuild
$(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 '/\/d' $(dir $@)/gprconfig_kb/db/linker.xml
$(VERBOSE)sed -i -e '/\/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)
# ali2dep
$(BUILD_LOCATION)/ali2dep/build/build.gpr:
$(ECHO) "$(BRIGHT_COL)preparing ali2dep...$(DEFAULT_COL)"
$(VERBOSE)git clone -b gcc_10_3_0 https://github.com/cproc/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)
$(VERBOSE)$(INSTALL_$(PLATFORM))
ifeq ($(INSTALL_LOCATION),$(DEFAULT_INSTALL_LOCATION))
$(VERBOSE)$(SUDO) ln -snf $(TOOL_CHAIN_VERSION) $(dir $(INSTALL_LOCATION))current
endif