build-host-gcc.sh 52.9 KB
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#!/bin/sh
#
# Copyright (C) 2012 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Rebuild the host GCC toolchain binaries from sources.
#
# NOTE: this script does not rebuild gdb, see build-host-gdb.sh for this.
#

# include common function and variable definitions
. `dirname $0`/prebuilt-common.sh

PROGRAM_PARAMETERS="[<toolchain-name>+]"
PROGRAM_DESCRIPTION="\
This program is used to rebuild one or more NDK cross-toolchains from scratch.
To use it, you will first need to call download-toolchain-sources.sh to download
the toolchain sources, then pass the corresponding directory with the
--toolchain-src-dir=<path> option.

If you don't pass any parameter, the script will rebuild all NDK toolchains
for the current host system [$HOST_TAG]. You can otherwise give a list of
toolchains among the following names:

  arm-linux-androideabi-4.4.3
  arm-linux-androideabi-4.6
  x64-4.4.3
  x86-4.6
  mipsel-linux-android-4.4.3
  mipsel-linux-android-4.6

By default, the script rebuilds the toolchain(s) for you host system [$HOST_TAG],
but you can use --systems=<tag1>,<tag2>,.. to ask binaries that can run on
several distinct systems. Each <tag> value in the list can be one of the
following:

   linux-x86
   linux-x86_64
   windows
   windows-x86  (equivalent to 'windows')
   windows-x86_64
   darwin-x86
   darwin-x86_64

For example, here's how to rebuild the ARM toolchains on Linux
for four different systems:

  $PROGNAME --toolchain-src-dir=/path/to/toolchain/src \
    --systems=linux-x86,linux-x86_64,windows,windows-x86_64 \
    arm-linux-androideabi-4.4.3 \
    arm-linux-androideabi-4.6

You can build Windows binaries on Linux if you have a Windows-targetting
cross-toolchain installed and in your path. Note that the script named
'build-mingw64-toolchain.sh' can be used to rebuild such a toolchain
(x86_64-w64-mingw32) from sources if you don't have one available.

Building the toolchains directly under Cygwin/MSys has not be tested and
is not recommended (it will be *extremely* slow, if it ever works).

On Darwin, the script will try to probe any compatibility SDK installed
on your development machine and will use the first it finds among a list
of well-known names. You can however force a specific usage with the
--darwin-sdk-version=<version> name, where <version> can be one of 10.4, 10.5,
10.6, 10.7, etc.

The generated binaries should run on 10.5 or higher. You can force a
different compatibility minimum with --darwin-min-version.

If you want to build Darwin binaries on a non-Darwin machine, you will
have to define DARWIN_TOOLCHAIN / DARWIN_SYSROOT in your environment first
(note: this feature is highly experimental).

The script is sufficiently clever to minimize all build steps, especially
if you try to build several toolchains for several distinct host systems. Note
however that generating a canadian-cross toolchain (e.g. building on Linux a
Windows toolchain that targets Android ARM binaries) will force the generation
of a host toolchain as well, in case it is not listed in your --systems list.
This is required to generate proper target GCC libraries.

The toolchain binaries are installed under \$NDK_DIR/toolchains by default,
but you can use --ndk-dir=<path> to specify a different NDK installation path.
The script will try to build the Gold linker for host/target combination that
are well supported (Gold doesn't build / is buggy for some of them). However,
the BFD linker is still the default used by the generated toolchain. You can
change this behaviour with two options:

   --default-ld=<name>  Changes the default toolchain linker.
                        <name> can be one of 'default', 'bfd' and 'gold'.

                        For now, 'default' is an alias for 'bfd', but we plan
                        to map it to 'gold' for some combos in the future, once
                        we're confident it works reliably

   --force-gold-build   Force the build of the Gold linker, even if it is known
                        to fail or generate a buggy linker. Only use this for
                        experimentation (e.g. with your own patched toolchain
                        sources).
"

BINUTILS_VERSION=$DEFAULT_BINUTILS_VERSION
register_var_option "--binutils-version=<version>" BINUTILS_VERSION "Select binutils version"

GMP_VERSION=$DEFAULT_GMP_VERSION
register_var_option "--gmp-version=<version>" GMP_VERSION "Select gmp version"

MPFR_VERSION=$DEFAULT_MPFR_VERSION
register_var_option "--mpfr-version=<version>" MPFR_VERSION "Select mpfr version"

MPC_VERSION=$DEFAULT_MPC_VERSION
register_var_option "--mpc-version=<version>" MPC_VERSION "Select mpc version"

TOOLCHAIN_SRC_DIR=
register_var_option "--toolchain-src-dir=<path>" TOOLCHAIN_SRC_DIR "Select toolchain source directory"

NDK_DIR=$ANDROID_NDK_ROOT
register_var_option "--ndk-dir=<path>" NDK_DIR "Select NDK install directory"

PACKAGE_DIR=
register_var_option "--package-dir=<path>" PACKAGE_DIR "Package prebuilt tarballs into directory"

HOST_SYSTEMS="$HOST_TAG"
register_var_option "--systems=<list>" HOST_SYSTEMS "Build binaries for these host systems"

FORCE=
register_var_option "--force" FORCE "Force full rebuild"

NO_TARGET_LIBS=
register_var_option "--no-target-libs" NO_TARGET_LIBS "Don't build gcc target libs."

NO_STRIP=
register_var_option "--no-strip" NO_STRIP "Don't strip generated binaries."

NO_COLOR=
register_var_option "--no-color" NO_COLOR "Don't output colored text."

if [ "$HOST_OS" = darwin ]; then
    DARWIN_SDK_VERSION=
    register_var_option "--darwin-sdk-version=<version>" DARWIN_SDK "Select Darwin SDK version."

    DARWIN_MIN_VERSION=
    register_var_option "--darwin-min-version=<version>" DARWIN_MIN_VERSION "Select minimum OS X version of generated host toolchains."
fi

DEFAULT_LD=
register_var_option "--default-ld=<name>" DEFAULT_LD "Select default linker ('bfd' or 'gold')."

FORCE_GOLD_BUILD=
register_var_option "--force-gold-build" FORCE_GOLD_BUILD "Always try to build Gold (experimental)."

register_jobs_option


extract_parameters "$@"

TOOLCHAINS=$PARAMETERS
if [ -z "$TOOLCHAINS" ]; then
    TOOLCHAINS="arm-linux-androideabi-4.4.3,arm-linux-androideabi-4.6,x86-4.4.3,x86-4.6,mipsel-linux-android-4.4.3,mipsel-linux-android-4.6"
    dump "Auto-config: $TOOLCHAINS"
fi

if [ -z "$TOOLCHAIN_SRC_DIR" ]; then
    panic "Please use --toolchain-src-dir=<path> to select toolchain source directory."
fi

case $DEFAULT_LD in
    gold|bfd)
      ;;
    "")
      # For now, we always use the default BFD linker.
      # We should be able to switch to Gold later when all bugs are fixed.
      DEFAULT_LD=bfd
      ;;
    *)
      panic "Invalid --default-ld name '$DEFAULT_LD', valid values are: bfd gold"
      ;;
esac

HOST_SYSTEMS=$(commas_to_spaces $HOST_SYSTEMS)
TOOLCHAINS=$(commas_to_spaces $TOOLCHAINS)

# The values of HOST_OS/ARCH/TAG will be redefined during the build to
# match those of the system the generated compiler binaries will run on.
#
# Save the original ones into BUILD_XXX variants, corresponding to the
# machine where the build happens.
#
BUILD_OS=$HOST_OS
BUILD_ARCH=$HOST_ARCH
BUILD_TAG=$HOST_TAG

# Important note: When identifying a build or host system, there is
# a difference between 'NDK system tags' and "GNU configuration triplet'.
#
# A "system tag" is specific to the NDK and identifies a given host
# system for the toolchain binaries, valid values:
#
#  linux-x86
#  linux-x86_64
#  windows        (historical alias to windows-x86)
#  windows-x86
#  windows-x86_64
#  darwin-x86
#  darwin-x86_64
#
# A GNU configuration triplet identifies a system too, but it used by
# configure scripts, not the NDK. They vary a lot too and some of the
# scripts are *very* picky about the exact values being used.
#
# Typical values that are known to work properly:
#
#    i686-linux-gnu       (Linux x86 system, with GNU libc)
#    x86_64-linux-gnu     (Same, with x86_64 CPU)
#    i586-mingw32msvc     (Windows 32-bits, MSVCRT.DLL)
#    i586-pc-mingw32msvc  (same)
#    i686-w64-mingw32     (same, slightly different sources)
#    x86_64-w64-mingw32   (Windows 64-bits, MSVCRT.DLL)
#    i686-apple-darwin    (OS X / Darwin, x86 CPU)
#    x86_64-apple-darwin  (OS X / Darwin, x86_64 CPU)
#
# A cross-toolchain will typically use the GNU configuration triplet as
# a prefix for all its binaries, but not always. For example, the 'mingw32'
# package on Ubuntu provides a Windows cross-toolchain that uses the
# i586-mingw32msvc prefix, but if you try to use it as a configuration
# triplet when configuring binutils-2.21, the build will fail. You need to
# pass i586-pc-mingw32msvc instead (binutils-2.19 accepts both).
#
# Another issue is that some toolchains need to use additional compiler
# flags to deal with backwards-compatibility SDKs (Darwin) or 32/64 bit
# code generation. Note all build scripts accept the same mix of
# '--with-cflags=...' or 'export CFLAGS' configuration, which makes
# things pretty difficult to manage.
#
# To work-around these issues, the script will generate "wrapper toolchains"
# with the prefix that the configure scripts expects. I.e. small scripts that
# redirect to the correct toolchain, eventually adding hidden extra compiler
# flags. This seems to completely get rid of the problems described above.
#


# $1: system tag (e.g. linux-x86)
tag_to_os ()
{
    local RET
    case $1 in
        linux-*) RET="linux";;
        darwin-*) RET="darwin";;
        windows|windows-*) RET="windows";;
    esac
    echo $RET
}

# $1: system tag (e.g. linux-x86)
tag_to_arch ()
{
    local RET
    case $1 in
        windows|*-x86) RET=x86;;
        *-x86_64) RET=x86_64;;
    esac
    echo $RET
}

# $1: system tag (e.g. linux-x86)
tag_to_bits ()
{
    local RET
    case $1 in
        windows|*-x86) RET=32;;
        *-x86_64) RET=64;;
    esac
    echo $RET
}

if [ "$NO_COLOR" ]; then
    COLOR_GREEN=
    COLOR_PURPLE=
    COLOR_CYAN=
    COLOR_END=
else
    COLOR_GREEN="\e[32m"
    COLOR_PURPLE="\e[35m"
    COLOR_CYAN="\e[36m"
    COLOR_END="\e[0m"
fi

# Pretty printing with colors!
host_text ()
{
    printf "[${COLOR_GREEN}${HOST}${COLOR_END}]"
}

toolchain_text ()
{
    printf "[${COLOR_PURPLE}${TOOLCHAIN}${COLOR_END}]"
}

target_text ()
{
    printf "[${COLOR_CYAN}${TARGET}${COLOR_END}]"
}

arch_text ()
{
    # Print arch name in cyan
    printf "[${COLOR_CYAN}${ARCH}${COLOR_END}]"
}

# We're going to cheat a little here. If we're only building a linux-x86
# on a linux-x86_64 machine, we want to change the value of BUILD_TAG
# to linux-x86 instead to speed-up the build.
#
# More generally speaking, we need to verify that if:
#   - we build a $BUILD_OS-x86 toolchain on a $BUILD_OS-x86_64 machine
#   - we don't want to build $BUILD_OS-x86_64 either.
#
# Then we can change our BUILD values to $BUILD_OS-x86
# This assumes that the build machine's toolchain can generate both
# 32-bit and 64-bit binaries with either -m32 or -m64
#
BUILD_BUILD_32=
BUILD_BUILD_64=
for SYSTEM in $HOST_SYSTEMS; do
    if [ "$(tag_to_os $SYSTEM)" = "$BUILD_OS" ]; then
        BUILD_BUILD_OS=true
        case $(tag_to_bits $SYSTEM) in
            32) BUILD_BUILD_32=true;;
            64) BUILD_BUILD_64=true;;
        esac
    fi
done

case $(tag_to_bits $BUILD_TAG) in
    64)
        # Building on a 64-bit machine
        if [ "$BUILD_BUILD_32" -a -z "$BUILD_BUILD_64" ]; then
            # Ok, we want to build a 32-bit toolchain on a 64-bit machine
            # So cheat a little now :-)
            BUILD_ARCH=x86
            BUILD_TAG=$BUILD_OS-$BUILD_ARCH
            dump "Forcing build config: $BUILD_TAG"
        fi
        ;;
esac

BUILD_BITS=$(tag_to_bits $BUILD_TAG)

# On Darwin, parallel installs of certain libraries do not work on
# some multi-core machines. So define NUM_BUILD_JOBS as 1 on this
# platform.
case $BUILD_OS in
    darwin) NUM_INSTALL_JOBS=1;;
    *) NUM_INSTALL_JOBS=$NUM_JOBS;;
esac

extract_version ()
{
    echo $1 | tr '-' '\n' | tail -1
}

# Given an input string of the form <foo>-<bar>-<version>, where
# <version> can be <major>.<minor>, extract <major>
#
# $1: versioned name (e.g. arm-linux-androideabi-4.4.3)
# Out: major version (e.g. 4)
#
# Examples:  arm-linux-androideabi-4.4.3 -> 4
#            gmp-0.81 -> 0
#
extract_major_version ()
{
    local RET=$(extract_version $1 | cut -d . -f 1)
    RET=${RET:-0}
    echo $RET
}

# Same as extract_major_version, but for the minor version number
# $1: versioned named
# Out: minor version
#
extract_minor_version ()
{
    local RET=$(extract_version $1 | cut -d . -f 2)
    RET=${RET:-0}
    echo $RET
}

# Compare two version numbers and only succeeds if the first one is
# greather or equal than the second one.
#
# $1: first version (e.g. 4.4.3)
# $2: second version (e.g. 4.6)
#
# Example: version_is_greater_than 4.6 4.4.3 --> success
#
version_is_greater_than ()
{
    local A_MAJOR A_MINOR B_MAJOR B_MINOR
    A_MAJOR=$(extract_major_version $1)
    B_MAJOR=$(extract_major_version $2)

    if [ $A_MAJOR -lt $B_MAJOR ]; then
        return 1
    elif [ $A_MAJOR -gt $B_MAJOR ]; then
        return 0
    fi

    # We have A_MAJOR == B_MAJOR here

    A_MINOR=$(extract_minor_version $1)
    B_MINOR=$(extract_minor_version $2)

    if [ $A_MINOR -lt $B_MINOR ]; then
        return 1
    else
        return 0
    fi
}

tag_to_config_triplet ()
{
    local RET
    case $1 in
        linux-x86) RET=i686-linux-gnu;;
        linux-x86_64) RET=x86_64-linux-gnu;;
        darwin-x86) RET=i686-apple-darwin;;
        darwin-x86_64) RET=x86_64-apple-darwin;;
        windows|windows-x86) RET=i586-pc-mingw32msvc;;
        windows-x86_64) RET=x86_64-w64-mingw32;;
    esac
    echo "$RET"
}

run_on_setup ()
{
    if [ "$PHASE" = setup ]; then
        run "$@"
    fi
}

setup_build ()
{
    BUILD_DIR=/tmp/ndk-$USER/build/host-gcc
    run_on_setup mkdir -p "$BUILD_DIR"
    if [ -n "$FORCE" ]; then
        rm -rf "$BUILD_DIR"/*
    fi

    TOP_BUILD_DIR=$BUILD_DIR

    setup_default_log_file $BUILD_DIR/build.log

    WRAPPERS_DIR="$BUILD_DIR/toolchain-wrappers"
    run_on_setup mkdir -p "$WRAPPERS_DIR" && run_on_setup rm -rf "$WRAPPERS_DIR/*"

    STAMPS_DIR="$BUILD_DIR/timestamps"
    run_on_setup mkdir -p "$STAMPS_DIR"
    if [ -n "$FORCE" ]; then
        run_on_setup rm -f "$STAMPS_DIR"/*
    fi

    if [ "$PACKAGE_DIR" ]; then
        mkdir -p "$PACKAGE_DIR"
        fail_panic "Can't create packaging directory: $PACKAGE_DIR"
    fi

    BUILD=$(tag_to_config_triplet $BUILD_TAG)
}

stamps_do ()
{
    local NAME=$1
    shift
    if [ ! -f "$STAMPS_DIR/$NAME" ]; then
        "$@"
        fail_panic
        mkdir -p "$STAMPS_DIR" && touch "$STAMPS_DIR/$NAME"
    fi
}

get_default_binutils_version_for_gcc ()
{
    local RET
    case $1 in
        arm-*-4.4.3|x86-*-4.4.3|x86-4.4.3) RET=2.19;;
        *) RET=2.21;;
    esac
    echo "$RET"
}

# Check that a given compiler generates code correctly
#
# This is to detect bad/broken toolchains, e.g. amd64-mingw32msvc
# is totally broken on Ubuntu 10.10 and 11.04
#
# $1: compiler
# $2: optional extra flags
#
check_compiler ()
{
    local CC="$1"
    local TMPC=/tmp/build-host-gcc-$USER-$$.c
    local TMPE=${TMPC%%.c}
    local TMPL=$TMPC.log
    local RET
    shift
    cat > $TMPC <<EOF
int main(void) { return 0; }
EOF
    log -n "Checking compiler code generation ($CC)... "
    $CC -o $TMPE $TMPC "$@" >$TMPL 2>&1
    RET=$?
    rm -f $TMPC $TMPE $TMPL
    if [ "$RET" = 0 ]; then
        log "yes"
    else
        log "no"
    fi
    return $RET
}


# $1: toolchain install dir
# $2: toolchain prefix, no trailing dash (e.g. arm-linux-androideabi)
# $3: optional -m32 or -m64.
try_host_fullprefix ()
{
    local PREFIX="$1/bin/$2"
    shift; shift;
    if [ -z "$HOST_FULLPREFIX" ]; then
        local GCC="$PREFIX-gcc"
        if [ -f "$GCC" ]; then
            if check_compiler "$GCC" "$@"; then
                HOST_FULLPREFIX="${GCC%%gcc}"
                dump "$(host_text) Using host gcc: $GCC $@"
            else
                dump "$(host_text) Ignoring broken host gcc: $GCC $@"
            fi
        fi
    fi
}

# $1: host prefix, no trailing slash (e.g. i686-linux-android)
# $2: optional compiler args (should be empty, -m32 or -m64)
try_host_prefix ()
{
    local PREFIX="$1"
    shift
    if [ -z "$HOST_FULLPREFIX" ]; then
        local GCC="$(which $PREFIX-gcc 2>/dev/null)"
        if [ "$GCC" -a -e "$GCC" ]; then
            if check_compiler "$GCC" "$@"; then
                HOST_FULLPREFIX=${GCC%%gcc}
                dump "$(host_text) Using host gcc: ${HOST_FULLPREFIX}gcc $@"
            else
                dump "$(host_text) Ignoring broken host gcc: $GCC $@"
            fi
        fi
    fi
}

# Used to determine the minimum possible Darwin version that a Darwin SDK
# can target. This actually depends from the host architecture.
# $1: Host architecture name
# out: SDK version number (e.g. 10.4 or 10.5)
darwin_arch_to_min_version ()
{
  if [ "$DARWIN_MIN_VERSION" ]; then
    echo "$DARWIN_MIN_VERSION"
  elif [ "$1" = "x86" ]; then
    echo "10.4"
  else
    echo "10.5"
  fi
}

# Use the check for the availability of a compatibility SDK in Darwin
# this can be used to generate binaries compatible with either Tiger or
# Leopard.
#
# $1: SDK root path
# $2: Darwin architecture
check_darwin_sdk ()
{
    if [ -d "$1" -a -z "$HOST_CFLAGS" ] ; then
        local MINVER=$(darwin_arch_to_min_version $2)
        HOST_CFLAGS="-isysroot $1 -mmacosx-version-min=$MINVER -DMAXOSX_DEPLOYEMENT_TARGET=$MINVER"
        HOST_CXXFLAGS=$HOST_CFLAGS
        HOST_LDFLAGS="-syslibroot $1 -mmacosx-version-min=$MINVER"
        dump "Generating $MINVER-compatible binaries."
        return 0  # success
    fi
    return 1
}

# Check that a given compiler generates 32 or 64 bit code.
# $1: compiler full path (.e.g  /path/to/fullprefix-gcc)
# $2: 32 or 64
# $3: extract compiler flags
# Return: success iff the compiler generates $2-bits code
check_compiler_bitness ()
{
    local CC="$1"
    local BITS="$2"
    local TMPC=/tmp/build-host-gcc-bits-$USER-$$.c
    local TMPL=$TMPC.log
    local RET
    shift; shift;
    cat > $TMPC <<EOF
/* this program will fail to compile if the compiler doesn't generate BITS-bits code */
int tab[1-2*(sizeof(void*)*8 != BITS)];
EOF
    dump -n "$(host_text) Checking that the compiler generates $BITS-bits code ($@)... "
    $CC -c -DBITS=$BITS -o /dev/null $TMPC $HOST_CFLAGS "$@" > $TMPL 2>&1
    RET=$?
    rm -f $TMPC $TMPL
    if [ "$RET" = 0 ]; then
        dump "yes"
    else
        dump "no"
    fi
    return $RET
}

# This function probes the system to find the best toolchain or cross-toolchain
# to build binaries that run on a given host system. After that, it generates
# a wrapper toolchain under $WRAPPERS_DIR with a prefix of ${HOST}-
# where $HOST is a GNU configuration name.
#
# Important: this script might redefine $HOST to a different value!
# Important: must be called after setup_build.
#
# $1: NDK system tag (e.g. linux-x86)
#
select_toolchain_for_host ()
{
    local HOST_CFLAGS HOST_CXXFLAGS HOST_LDFLAGS HOST_FULLPREFIX DARWIN_ARCH

    # We do all the complex auto-detection magic in the setup phase,
    # then save the result in host-specific global variables.
    #
    # In the build phase, we will simply restore the values into the
    # global HOST_FULLPREFIX / HOST_BUILD_DIR
    # variables.
    #

    # Try to find the best toolchain to do that job, assuming we are in
    # a full Android platform source checkout, we can look at the prebuilts/
    # directory.
    case $1 in
        linux-x86)
            # If possible, automatically use our custom toolchain to generate
            # 32-bit executables that work on Ubuntu 8.04 and higher.
            try_host_fullprefix "$(dirname $ANDROID_NDK_ROOT)/prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.6" i686-linux
            try_host_fullprefix "$(dirname $ANDROID_NDK_ROOT)/prebuilts/gcc/linux-x86/host/i686-linux-glibc2.7-4.4.3" i686-linux
            try_host_fullprefix "$(dirname $ANDROID_NDK_ROOT)/prebuilt/linux-x86/toolchain/i686-linux-glibc2.7-4.4.3" i686-linux
            try_host_prefix i686-linux-gnu
            try_host_prefix i686-linux
            try_host_prefix x86_64-linux-gnu -m32
            try_host_prefix x86_64-linux -m32
            ;;

        linux-x86_64)
            # If possible, automaticaly use our custom toolchain to generate
            # 64-bit executables that work on Ubuntu 8.04 and higher.
            try_host_fullprefix "$(dirname $ANDROID_NDK_ROOT)/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.7-4.6" x86_64-linux
            try_host_prefix x86_64-linux-gnu
            try_host_prefix x84_64-linux
            try_host_prefix i686-linux-gnu -m64
            try_host_prefix i686-linux -m64
            ;;

        darwin-*)
            DARWIN_ARCH=$(tag_to_arch $1)
            case $BUILD_OS in
                darwin)
                    if [ "$DARWIN_SDK_VERSION" ]; then
                        # Compute SDK subdirectory name
                        case $DARWIN_SDK_VERSION in
                            10.4) DARWIN_SDK_SUBDIR=$DARWIN_SDK.sdku;;
                            *) DARWIN_SDK_SUBDIR=$DARWIN_SDK.sdk;;
                        esac
                        # Since xCode moved to the App Store the SDKs have been 'sandboxed' into the Xcode.app folder.
                        check_darwin_sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX$DARWIN_SDK_SUBDIR $DARWIN_ARCH
                        check_darwin_sdk /Developer/SDKs/MacOSX$DARWIN_SDK_SUBDIR $DARWIN_ARCH
                    else
                        # Since xCode moved to the App Store the SDKs have been 'sandboxed' into the Xcode.app folder.
                        check_darwin_sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.7.sdk $DARWIN_ARCH
                        check_darwin_sdk /Developer/SDKs/MacOSX10.7.sdk  $DARWIN_ARCH
                        check_darwin_sdk /Developer/SDKs/MacOSX10.6.sdk  $DARWIN_ARCH
                        # NOTE: The 10.5.sdk on Lion is buggy and cannot build basic C++ programs
                        #check_darwin_sdk /Developer/SDKs/MacOSX10.5.sdk  $DARWIN_ARCH
                        # NOTE: The 10.4.sdku is not available anymore and could not be tested.
                        #check_darwin_sdk /Developer/SDKs/MacOSX10.4.sdku $DARWIN_ARCH
                    fi
                    if [ -z "$HOST_CFLAGS" ]; then
                        local version="$(sw_vers -productVersion)"
                        log "Generating $version-compatible binaries!"
                    fi
                    ;;
                *)
                    if [ -z "$DARWIN_TOOLCHAIN" -o -z "$DARWIN_SYSROOT" ]; then
                        dump "If you want to build Darwin binaries on a non-Darwin machine,"
                        dump "Please define DARWIN_TOOLCHAIN to name it, and DARWIN_SYSROOT to point"
                        dump "to the SDK. For example:"
                        dump ""
                        dump "   DARWIN_TOOLCHAIN=\"i686-apple-darwin11\""
                        dump "   DARWIN_SYSROOT=\"~/darwin-cross/MacOSX10.7.sdk\""
                        dump "   export DARWIN_TOOLCHAIN DARWIN_SYSROOT"
                        dump ""
                        exit 1
                    fi
724
                    local DARWINMINVER=$(darwin_arch_to_min_version $2)
725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
                    check_darwin_sdk $DARWIN_SYSROOT $DARWINARCH
                    try_host_prefix "$DARWIN_TOOLCHAIN" -m$(tag_to_bits $1) --sysroot "$DARWIN_SYSROOT"
                    if [ -z "$HOST_FULLPREFIX" ]; then
                        dump "It looks like $DARWIN_TOOLCHAIN-gcc is not in your path, or does not work correctly!"
                        exit 1
                    fi
                    dump "Using darwin cross-toolchain: ${HOST_FULLPREFIX}gcc"
                    ;;
            esac
            ;;

        windows|windows-x86)
            case $BUILD_OS in
                linux)
                    # We favor these because they are more recent, and because
                    # we have a script to rebuild them from scratch. See
                    # build-mingw64-toolchain.sh.
                    try_host_prefix x86_64-w64-mingw32 -m32
                    try_host_prefix i686-w64-mingw32
                    # Typically provided by the 'mingw32' package on Debian
                    # and Ubuntu systems.
                    try_host_prefix i586-mingw32msvc
                    # Special note for Fedora: this distribution used
                    # to have a mingw32-gcc package that provided a 32-bit
                    # only cross-toolchain named i686-pc-mingw32.
                    # Later versions of the distro now provide a new package
                    # named mingw-gcc which provides i686-w64-mingw32 and
                    # x86_64-w64-mingw32 instead.
                    try_host_prefix i686-pc-mingw32
                    if [ -z "$HOST_FULLPREFIX" ]; then
                        dump "There is no Windows cross-compiler. Ensure that you"
                        dump "have one of these installed and in your path:"
                        dump "   x86_64-w64-mingw32-gcc  (see build-mingw64-toolchain.sh)"
                        dump "   i686-w64-mingw32-gcc    (see build-mingw64-toolchain.sh)"
                        dump "   i586-mingw32msvc-gcc    ('mingw32' Debian/Ubuntu package)"
                        dump "   i686-pc-mingw32         (on Fedora)"
                        dump ""
                        exit 1
                    fi
                    # Adjust $HOST to match the toolchain to ensure proper builds.
                    # I.e. chose configuration triplets that are known to work
                    # with the gmp/mpfr/mpc/binutils/gcc configure scripts.
                    case $HOST_FULLPREFIX in
                        *-mingw32msvc-*|i686-pc-mingw32)
                            HOST=i586-pc-mingw32msvc
                            ;;
                        *)
                            HOST=i686-w64-mingw32msvc
                            ;;
                    esac
                    ;;
                *) panic "Sorry, this script only supports building windows binaries on Linux."
                ;;
            esac
            ;;

        windows-x86_64)
            # Sanity check for GMP which doesn't build with x86_64-w64-mingw32-gcc
            # before 5.0. We already have 5.0.5 in AOSP toolchain source tree, so
            # suggest it here.
            if ! version_is_greater_than $GMP_VERSION 5.0; then
                dump "You cannot build a 64-bit Windows toolchain with this version of libgmp."
                dump "Please use --gmp-version=5.0.5 to fix this."
                exit 1
            fi
            case $BUILD_OS in
                linux)
                    # See comments above for windows-x86
                    try_host_prefix x86_64-w64-mingw32
                    try_host_prefix i686-w64-mingw32 -m64
                    # Beware that this package is completely broken on many
                    # versions of no vinegar Ubuntu (i.e. it fails at building trivial
                    # programs).
                    try_host_prefix amd64-mingw32msvc
                    # There is no x86_64-pc-mingw32 toolchain on Fedora.
                    if [ -z "$HOST_FULLPREFIX" ]; then
                        dump "There is no Windows cross-compiler in your path. Ensure you"
                        dump "have one of these installed and in your path:"
                        dump "   x86_64-w64-mingw32-gcc  (see build-mingw64-toolchain.sh)"
                        dump "   i686-w64-mingw32-gcc    (see build-mingw64-toolchain.sh)"
                        dump "   amd64-mingw32msvc-gcc   (Debian/Ubuntu - broken until Ubuntu 11.10)"
                        dump ""
                        exit 1
                    fi
                    # See comment above for windows-x86
                    case $HOST_FULLPREFIX in
                        *-mingw32msvc*)
                            # Actually, this has never been tested.
                            HOST=amd64-pc-mingw32msvc
                            ;;
                        *)
                            HOST=x86_64-w64-mingw32
                            ;;
                    esac
                    ;;

                *) panic "Sorry, this script only supports building windows binaries on Linux."
                ;;
            esac
            ;;
    esac

    mkdir -p "$(host_build_dir)"
    if [ "$FORCE" ]; then
        rm -rf "$(host_build_dir)"/*
    fi

    # Determine the default bitness of our compiler. It it doesn't match
    # HOST_BITS, tries to see if it supports -m32 or -m64 to change it.
    if ! check_compiler_bitness ${HOST_FULLPREFIX}gcc $HOST_BITS; then
        TRY_CFLAGS=
        case $HOST_BITS in
            32) TRY_CFLAGS=-m32;;
            64) TRY_CFLAGS=-m64;;
        esac
        if ! check_compiler_bitness ${HOST_FULLPREFIX}gcc $HOST_BITS $TRY_CFLAGS; then
            panic "Can't find a way to generate $HOST_BITS binaries with this compiler: ${HOST_FULLPREFIX}gcc"
        fi
        HOST_CFLAGS=$HOST_CFLAGS" "$TRY_CFLAGS
        HOST_CXXFLAGS=$HOST_CXXFLAGS" "$TRY_CFLAGS
    fi

    # Support for ccache, to speed up rebuilds.
    DST_PREFIX=$HOST_FULLPREFIX
    if [ "$NDK_CCACHE" ]; then
        DST_PREFIX="$NDK_CCACHE $HOST_FULLPREFIX"
    fi

    # We're going to generate a wrapper toolchain with the $HOST prefix
    # i.e. if $HOST is 'i686-linux-gnu', then we're going to generate a
    # wrapper toolchain named 'i686-linux-gnu-gcc' that will redirect
    # to whatever HOST_FULLPREFIX points to, with appropriate modifier
    # compiler/linker flags.
    #
    # This helps tremendously getting stuff to compile with the GCC
    # configure scripts.
    #
    run $NDK_BUILDTOOLS_PATH/gen-toolchain-wrapper.sh "$WRAPPERS_DIR" \
        --src-prefix="$HOST-" \
        --dst-prefix="$DST_PREFIX" \
        --cflags="$HOST_CFLAGS" \
        --cxxflags="$HOST_CXXFLAGS" \
        --ldflags="$HOST_LDFLAGS"
}

# Call this before anything else to setup a few important variables that are
# used consistently to build any host-specific binaries.
#
# $1: Host system name (e.g. linux-x86), this is the name of the host system
#     where the generated GCC binaries will run, not the current machine's
#     type (this one is in $ORIGINAL_HOST_TAG instead).
#
setup_build_for_host ()
{
    local HOST_VARNAME=$(dashes_to_underscores $1)
    local HOST_VAR=_HOST_${HOST_VARNAME}

    # Determine the host configuration triplet in $HOST
    HOST=$(tag_to_config_triplet $1)
    HOST_OS=$(tag_to_os $1)
    HOST_ARCH=$(tag_to_arch $1)
    HOST_BITS=$(tag_to_bits $1)
    HOST_TAG=$1

    # Note: since select_toolchain_for_host can change the value of $HOST
    # we need to save it in a variable to later get the correct one when
    # this function is called again.
    if [ -z "$(var_value ${HOST_VAR}_SETUP)" ]; then
        select_toolchain_for_host $1
        var_assign ${HOST_VAR}_CONFIG $HOST
        var_assign ${HOST_VAR}_SETUP true
    else
        HOST=$(var_value ${HOST_VAR}_CONFIG)
    fi
}

# Returns the location of all $HOST specific files (build and install)
host_build_dir ()
{
    echo "$TOP_BUILD_DIR/$HOST"
}

# Return the location of the build directory for a specific component
# $1: component name (e.g. gmp-4.2.4)
host_build_dir_for ()
{
    echo "$(host_build_dir)/build-$1"
}

# Returns the install location of the $HOST pre-reqs libraries
host_prereqs_install_dir ()
{
    echo "$(host_build_dir)/temp-prereqs"
}

# Returns the install location of the $HOST binutils cross-toolchain
host_binutils_install_dir ()
{
    echo "$(host_build_dir)/temp-binutils-$BINUTILS_VERSION-$TARGET"
}

# Returns the install location of the $HOST binutils cross-toolchain
build_binutils_install_dir ()
{
    echo "$TOP_BUILD_DIR/$BUILD/temp-binutils-$BINUTILS_VERSION-$TARGET"
}

# Returns the install location of the $HOST gcc cross-toolchain
host_gcc_install_dir ()
{
    echo "$(host_build_dir)/temp-$TOOLCHAIN"
}

# Returns the install location of the $BUILD gcc cross-toolchain
build_gcc_install_dir ()
{
    echo "$TOP_BUILD_DIR/$BUILD/temp-$TOOLCHAIN"
}


# Location of the host sysroot used during the build
host_sysroot ()
{
    # This must be a sub-directory of $(host_gcc_install_dir)
    # to generate relocatable binaries that are used by
    # standalone versions of the toolchain.
    #
    # If you change this, you will need to modify make-standalone-toolchain.sh
    # as well.
    #
    echo "$(host_gcc_install_dir)/sysroot"
}

# Returns the final install location of the $HOST toolchain
# This ones contains the binutils binaries, the gcc ones,
# the target libraries, but does *not* include the sysroot
# and other stuff (e.g. documentation like info or man files).
#
host_gcc_final_dir ()
{
    echo "$(host_build_dir)/final-$TOOLCHAIN"
}

setup_build_for_toolchain ()
{
    GCC_VERSION=$(extract_version $1)
    BINUTILS_VERSION=$(get_default_binutils_version_for_gcc $1)

    TARGET_ARCH=$(echo $1 | cut -d - -f 1)

    # NOTE: The 'mipsel' toolchain architecture name maps to the 'mips'
    # NDK architecture name.
    case $TARGET_ARCH in
        arm) TARGET=arm-linux-androideabi;;
        x86) TARGET=i686-linux-android;;
        mips|mipsel) TARGET=mipsel-linux-android; TARGET_ARCH=mips;;
        *) panic "Unknown target toolchain architecture: $TARGET_ARCH"
    esac

    # MPC is only needed starting with GCC 4.5
    HOST_NEED_MPC=
    if version_is_greater_than $GCC_VERSION 4.5; then
        HOST_NEED_MPC=true
    fi

    # TODO: We will need to place these under
    #      $NDK_DIR/prebuilts/$HOST/android-$TARGET_ARCH-gcc-$GCC_VERSION/
    #      in a future patch.
    TOOLCHAIN_SUB_DIR=toolchains/$TOOLCHAIN/prebuilt/$HOST_TAG
    TOOLCHAIN_INSTALL_DIR=$NDK_DIR/$TOOLCHAIN_SUB_DIR

    # These will go into CFLAGS_FOR_TARGET and others during the build
    # of GCC target libraries.
    if [ -z "$NO_STRIP" ]; then
        TARGET_CFLAGS="-O2 -Os -fomit-frame-pointer -s"
    else
        TARGET_CFLAGS="-O2 -Os -g"
    fi

    TARGET_CXXFLAGS=$TARGET_CFLAGS
    TARGET_LDFLAGS=""

    case $TARGET_ARCH in
        x86)
        TARGET_CFLAGS=$TARGET_CFLAGS" \
        -DANDROID -D__ANDROID__ -Ulinux \
        -fPIC -Wa,--noexecstack -m32 -fstack-protector \
        -W -Wall -Werror=address -Werror=format-security -Werror=non-virtual-dtor -Werror=return-type \
        -Werror=sequence-point -Winit-self -Wno-multichar -Wno-unused -Wpointer-arith -Wstrict-aliasing=2 \
        -fexceptions -ffunction-sections -finline-functions \
        -finline-limit=300 -fmessage-length=0 -fno-inline-functions-called-once \
        -fno-strict-aliasing -frtti \
        -fstrict-aliasing -funswitch-loops -funwind-tables \
        -march=i686 -mtune=atom -mbionic -mfpmath=sse -mstackrealign -DUSE_SSE2"

        TARGET_LDFLAGS=$TARGET_LDFLAGS" \
        -m32 -O2 -g -fPIC \
        -nostartfiles \
        -Wl,-z,noexecstack -Wl,--gc-sections -nostdlib \
        -fexceptions -frtti -fstrict-aliasing -ffunction-sections -finline-functions  \
        -finline-limit=300 -fno-inline-functions-called-once \
        -funswitch-loops -funwind-tables -mstackrealign \
        -ffunction-sections -funwind-tables -fmessage-length=0 \
        -march=i686 -mstackrealign -mfpmath=sse -mbionic \
        -Wno-multichar -Wl,-z,noexecstack -Werror=format-security -Wstrict-aliasing=2 \
        -W -Wall -Wno-unused -Winit-self -Wpointer-arith -Werror=return-type -Werror=non-virtual-dtor \
        -Werror=address -Werror=sequence-point \
        -Werror=format-security -Wl,--no-undefined"

        # The following was removed from the assignment above because we can't build these object files
        # unless we already have a working binutils / assembler for them. I believe these are now handled
        # by the right gcc config files now. Also TARGET_SYSROOT isn't defined yet.
        #
        #-nostartfiles $TARGET_SYSROOT/usr/lib/crtbegin_dynamic.o $TARGET_SYSROOT/usr/lib/crtend_android.o"
        ;;

        mips)
        # Enable C++ exceptions, RTTI and GNU libstdc++ at the same time
        # You can't really build these separately at the moment.
        # Add -fpic, because MIPS NDK will need to link .a into .so.
        TARGET_CFLAGS=$TARGET_CFLAGS" -fexceptions -fpic"
        TARGET_CXXFLAGS=$TARGET_CXXFLAGS" -frtti -fpic"
        ;;
    esac
}

# This function is used to setup the build environment whenever we
# generate host-specific binaries.
#
setup_host_env ()
{
    CC=$HOST-gcc
    CXX=$HOST-g++
    LD=$HOST-ld
    AR=$HOST-ar
    AS=$HOST-as
    RANLIB=$HOST-ranlib
    NM=$HOST-nm
    STRIP=$HOST-strip
    STRINGS=$HOST-strings
    export CC CXX AS LD AR RANLIB STRIP STRINGS NM

    CFLAGS=
    CXXFLAGS=
    LDFLAGS=
    if [ -z "$NO_STRIP" ]; then
        CFLAGS="-O2 -Os -fomit-frame-pointer -s"
        CXXFLAGS=$CFLAGS
    fi

    # This should only used when building the target GCC libraries
    CFLAGS_FOR_TARGET=$TARGET_CFLAGS
    CXXFLAGS_FOR_TARGET=$TARGET_CXXFLAGS
    LDFLAGS_FOR_TARGET=$TARGET_LDFLAGS

    export CFLAGS CXXFLAGS LDFLAGS CFLAGS_FOR_TARGET CXXFLAGS_FOR_TARGET LDFLAGS_FOR_TARGET

    PATH=$WRAPPERS_DIR:$PATH
}

# $1: NDK architecture name (e.g. 'arm')
arch_sysroot_install_dir ()
{
    echo "$BUILD_DIR/arch-$1/sysroot"
}

# $1: NDK architecture name (e.g. 'arm')
arch_sysroot_dir ()
{
    echo "$(arch_sysroot_install_dir $1)/$(get_default_platform_sysroot_for_arch $1)"
}

# $1: architecture name
gen_minimal_sysroot ()
{
    local ARCH=$1
    local INSTALL_DIR=$(arch_sysroot_install_dir $ARCH)

    dump "$(arch_text) Generating minimal sysroot."
    run2 $NDK_BUILDTOOLS_PATH/gen-platforms.sh --minimal --arch=$ARCH --dst-dir="$INSTALL_DIR"
}


# $1: gmp version
extract_gmp_sources ()
{
    local SRC_DIR="$TOP_BUILD_DIR/temp-src"

    dump "Extracting gmp-$1"
    run2 mkdir -p "$SRC_DIR" &&
    run2 tar xjf "$TOOLCHAIN_SRC_DIR/gmp/gmp-$1.tar.bz2" -C "$SRC_DIR"
}

# $1: gmp version
build_gmp ()
{
    local SRC_DIR="$TOP_BUILD_DIR/temp-src/gmp-$1"
    local INSTALL_DIR="$(host_prereqs_install_dir)"
    local BUILD_DIR

    stamps_do extract-gmp-$1 extract_gmp_sources $1

    dump "$(host_text) Building gmp-$1"
    (
        setup_host_env &&
        BUILD_DIR="$(host_build_dir_for gmp-$GMP_VERSION)" &&
        run2 mkdir -p "$BUILD_DIR" && run2 rm -rf "$BUILD_DIR"/* &&
        cd "$BUILD_DIR" &&
        run2 "$SRC_DIR"/configure \
            --prefix=$INSTALL_DIR \
            --build=$BUILD \
            --host=$HOST \
            --disable-shared &&
        run2 make -j$NUM_JOBS &&
        run2 make install -j$NUM_INSTALL_JOBS
    )
    return $?
}

extract_mpfr_sources ()
{
    local SRC_DIR="$TOP_BUILD_DIR/temp-src"

    dump "Extracting mpfr-$1"
    run2 mkdir -p "$SRC_DIR" &&
    run2 tar xjf "$TOOLCHAIN_SRC_DIR/mpfr/mpfr-$1.tar.bz2" -C "$SRC_DIR"
}

# $1: mpfr-version
build_mpfr ()
{
    local SRC_DIR="$TOP_BUILD_DIR/temp-src/mpfr-$1"
    local INSTALL_DIR="$(host_prereqs_install_dir)"
    local BUILD_DIR

    stamps_do extract-mpfr-$MPFR_VERSION extract_mpfr_sources $1

    stamps_do build-gmp-$GMP_VERSION-$HOST build_gmp $GMP_VERSION

    dump "$(host_text) Building mpfr-$1"
    (
        setup_host_env &&
        BUILD_DIR="$(host_build_dir_for mpfr-$MPFR_VERSION)" &&
        run2 mkdir -p "$BUILD_DIR" && run2 rm -rf "$BUILD_DIR"/* &&
        cd $BUILD_DIR &&
        run2 "$SRC_DIR"/configure \
            --prefix=$INSTALL_DIR \
            --build=$BUILD \
            --host=$HOST \
            --disable-shared \
            --with-gmp=$INSTALL_DIR &&
        run2 make -j$NUM_JOBS &&
        run2 make -j$NUM_INSTALL_JOBS install
    )
    return $?
}

# $1: mpc-version
extract_mpc_sources ()
{
    local SRC_DIR="$TOP_BUILD_DIR/temp-src"

    dump "Extracting mpc-$1"
    run2 mkdir -p "$SRC_DIR" &&
    run2 tar xzf "$TOOLCHAIN_SRC_DIR/mpc/mpc-$1.tar.gz" -C "$SRC_DIR"
}


# $1: mpc-version
build_mpc ()
{
    local SRC_DIR="$TOP_BUILD_DIR/temp-src/mpc-$1"
    local INSTALL_DIR="$(host_prereqs_install_dir)"
    local BUILD_DIR

    stamps_do extract-mpc-$1 extract_mpc_sources $1

    stamps_do build-mpfr-$MPFR_VERSION-$HOST build_mpfr $MPFR_VERSION

    dump "$(host_text) Building mpc-$1"
    (
        setup_host_env &&
        BUILD_DIR="$(host_build_dir_for mpc-$MPC_VERSION)" &&
        run2 mkdir -p "$BUILD_DIR" && run2 rm -rf "$BUILD_DIR"/* &&
        cd $BUILD_DIR &&
        run2 "$SRC_DIR"/configure \
            --prefix=$INSTALL_DIR \
            --build=$BUILD \
            --host=$HOST \
            --disable-shared \
            --with-gmp=$INSTALL_DIR \
            --with-mpfr=$INSTALL_DIR &&
        run2 make -j$NUM_JOBS &&
        run2 make -j$NUM_INSTALL_JOBS install
    )
    return $?
}

# Build all pre-required host libraries (gmp, mpfr, etc...) that are needed
# by binutils and gcc, as static libraries that will be placed under
# $HOST_BUILD_DIR/temp-install
#
# $1: toolchain source directory
#
build_host_prereqs ()
{
    local INSTALL_DIR="$(host_prereqs_install_dir)"
    local ARGS

    ARGS=" --with-gmp=$INSTALL_DIR --with-mpfr=$INSTALL_DIR"

    # Only build MPC when we need it.
    if [ "$HOST_NEED_MPC" ]; then
        ARGS=$ARGS" --with-mpc=$INSTALL_DIR"
        stamps_do build-mpc-$MPC_VERSION-$HOST build_mpc $MPC_VERSION
    else
        stamps_do build-mpfr-$MPFR_VERSION-$HOST build_mpfr $MPFR_VERSION
    fi

    # This gets used by build_host_binutils and others.
    HOST_PREREQS_ARGS=$ARGS
}

build_host_binutils ()
{
    local SRC_DIR="$TOOLCHAIN_SRC_DIR/binutils/binutils-$BINUTILS_VERSION"
    local INSTALL_DIR="$(host_binutils_install_dir)"
    local PREREQS_INSTALL_DIR="$(host_prereqs_install_dir)"
    local ARGS

    build_host_prereqs

    ARGS=" --with-gmp=$PREREQS_INSTALL_DIR --with-mpfr=$PREREQS_INSTALL_DIR"
    if [ "$HOST_NEED_MPC" ]; then
        ARGS=$ARGS" --with-mpc=$PREREQS_INSTALL_DIR"
    fi

    LD_NAME=$DEFAULT_LD

    # Enable Gold, for specific builds. The version before binutils 2.21
    # is buggy so don't use it
    case $HOST_OS in
        windows) BUILD_GOLD=;; # Gold doesn't compile on Windows!
        darwin) BUILD_GOLD=;;  # Building Gold fails with an internal compiler error on Darwin!
        *) BUILD_GOLD=true;;
    esac

    # Special case, gold in binutil-2.21 doesn't build when targetting mips
    if [ "$BINUTILS_VERSION" = "2.21" -a "$TARGET" = "mipsel-linux-android" ]; then
        BUILD_GOLD=
    fi

    # Another special case, gold in binutils-2.21 for arch-x86 is buggy
    # (i.e. when building the platform with it, the system doesn't boot)
    #
    if [ "$BINUTILS_VERSION" = "2.21" -a "$TARGET" = "i686-linux-android" ]; then
        USE_LD_DEFAULT=true
    fi

    if [ "$DEFAULT_LD" = "gold" -a -z "$BUILD_GOLD" ]; then
        dump "$(host_text)$(target_text): Cannot build Gold for this toolchain!"
        BUILD_GOLD=
    fi

    # Ok, if the user *really* wants it, we're going to build Gold anyway.
    # There are no guarantees about the correctness of the resulting binary.
    # --default-ld still determines the default linker to use by the toolchain.
    #
    if [ "$FORCE_GOLD_BUILD" -a -z "$BUILD_GOLD" ]; then
        dump "$(host_text)$(target_text): Warning: forcing build of potentially buggy Gold linker!"
        BUILD_GOLD=true
    fi

    # The BFD linker is always built, but to build Gold, we need a specific
    # option for the binutils configure script. Note that its format has
    # changed during development.
    if [ "$BUILD_GOLD" ]; then
        # The syntax of the --enable-gold option has changed.
        if version_is_greater_than $BINUTILS_VERSION 2.20; then
            if [ "$DEFAULT_LD" = "bfd" ]; then
                ARGS=$ARGS" --enable-gold --enable-ld=default"
            else
                ARGS=$ARGS" --enable-gold=default --enable-ld"
            fi
        else
            if [ "$DEFAULT_LD" = "bfd" ]; then
                ARGS=$ARGS" --enable-gold=both"
            else
                ARGS=$ARGS" --enable-gold=both/gold"
            fi
        fi
    fi

    # This is used to install libbfd which is later used to compile
    # oprofile for the platform. This is not technically required for
    # the NDK, but allows us to use the same toolchain for the platform
    # build. TODO: Probably want to move this step to its own script
    # like build-host-libbfd.sh in the future.
    ARGS=$ARGS" --enable-install-libbfd"

    dump "$(host_text)$(target_text) Building binutils-$BINUTILS_VERSION"
    (
        setup_host_env &&
        BUILD_DIR="$(host_build_dir_for binutils-$BINUTILS_VERSION-$TARGET)" &&
        run2 mkdir -p "$BUILD_DIR" && run2 rm -rf "$BUILD_DIR"/* &&
        cd "$BUILD_DIR" &&
        run2 "$SRC_DIR"/configure \
            --prefix="$INSTALL_DIR" \
            --disable-shared \
            --disable-werror \
            --disable-nls \
            --build=$BUILD \
            --host=$HOST \
            --target=$TARGET \
            --with-sysroot="$INSTALL_DIR/sysroot" \
            $ARGS &&
        run2 make -j$NUM_JOBS &&
        run2 make -j$NUM_INSTALL_JOBS install &&
        # We need to take care of something weird, binutils-2.21 on mips
        # doesn't seem to build gold, and the Makefile script forgets to
        # copy it to $INSTALL/bin/mipsel-linux-android-ld. Take care of this
        # here with a symlink, which will be enough for now.
        if [ ! -f "$INSTALL_DIR/bin/$TARGET-ld" ]; then
            run2 ln -s "$TARGET-ld.bfd" "$INSTALL_DIR/bin/$TARGET-ld"
        fi
    )
    return $?
}

copy_target_sysroot ()
{
    local SRC_SYSROOT=$(arch_sysroot_dir $TARGET_ARCH)
    local SYSROOT=$(host_sysroot)

    # We need the arch-specific minimal sysroot
    stamps_do sysroot-arch-$TARGET_ARCH gen_minimal_sysroot $TARGET_ARCH

    dump "$(host_text)$(toolchain_text) Copying $TARGET_ARCH sysroot"
    run2 rm -rf "$SYSROOT" &&
    run2 copy_directory "$SRC_SYSROOT" "$SYSROOT"
}

build_host_gcc_core ()
{
    local SRC_DIR="$TOOLCHAIN_SRC_DIR/gcc/gcc-$GCC_VERSION"
    local INSTALL_DIR="$(host_gcc_install_dir)"
    local ARGS NEW_PATH

    stamps_do build-binutils-$BINUTILS_VERSION-$HOST-$TARGET build_host_binutils
    stamps_do sysroot-gcc-$SYSTEM-$TOOLCHAIN copy_target_sysroot

    build_host_prereqs

    NEW_PATH=$(host_gcc_install_dir)/bin:$(host_binutils_install_dir)/bin
    if [ "$HOST" != "$BUILD" ]; then
        NEW_PATH=$(build_gcc_install_dir)/bin:$(build_binutils_install_dir)/bin
    fi

    ARGS=$HOST_PREREQS_ARGS

    ARGS=$ARGS" --with-gnu-as --with-gnu-ld"
    ARGS=$ARGS" --enable-threads --disable-libssp --disable-libmudflap"
    ARGS=$ARGS" --disable-libgomp"  # TODO: Add option to enable this
    ARGS=$ARGS" --disable-libstdc__-v3 --disable-sjlj-exceptions"
    ARGS=$ARGS" --disable-tls"
    ARGS=$ARGS" --disable-libquadmath --disable-plugin --disable-libitm --disable-bootstrap"
    ARGS=$ARGS" --enable-languages=c,c++"
    ARGS=$ARGS" --disable-shared"
    ARGS=$ARGS" --disable-nls"
    ARGS=$ARGS" --disable-werror"
    ARGS=$ARGS" --enable-target-optspace"

    # Place constructors/destructors in .init_array/.fini_array, not in
    # .ctors/.dtors on Android. Note that upstream Linux GLibc is now doing
    # the same.
    ARGS=$ARGS" --enable-initfini-array"

    case $TARGET_ARCH in
        arm)
            ARGS=$ARGS" --with-arch=armv5te --with-float=soft --with-fpu=vfp"
            ;;
        mips)
            # Add --disable-fixed-point to disable fixed-point support
            # Add --disable-threads for eh_frame handling in a single thread
            ARGS=$ARGS" --with-arch=mips32 --disable-fixed-point --disable-threads"
            ;;
    esac

    dump "$(host_text)$(toolchain_text) Building gcc-core"
    (
        setup_host_env &&
        BUILD_DIR="$(host_build_dir_for gcc-$GCC_VERSION-$TARGET)" &&
        run2 mkdir -p "$BUILD_DIR" && run2 rm -rf "$BUILD_DIR"/* &&
        cd "$BUILD_DIR" &&
        PATH=$NEW_PATH:$PATH &&
        run2 "$SRC_DIR"/configure \
            --prefix="$INSTALL_DIR" \
            --build=$BUILD \
            --host=$HOST \
            --target=$TARGET \
            --with-sysroot="$INSTALL_DIR/sysroot" \
            $HOST_PREREQS_ARGS $ARGS &&
        run2 make -j$NUM_JOBS all-gcc &&
        run2 make -j$NUM_INSTALL_JOBS install-gcc
    )
    return $?
}

build_target_gcc_libs ()
{
    local SRC_DIR="$TOOLCHAIN_SRC_DIR/gcc/gcc-$GCC_VERSION"
    local INSTALL_DIR="$(host_gcc_install_dir)"
    local ARGS NEW_PATH

    stamps_do gcc-core-$GCC_VERSION-$SYSTEM-$TOOLCHAIN build_host_gcc_core

    NEW_PATH=$(host_gcc_install_dir)/bin:$(host_binutils_install_dir)/bin

    dump "$(host_text)$(toolchain_text) Building target libraries"
    (
        setup_host_env &&
        BUILD_DIR="$(host_build_dir_for gcc-$GCC_VERSION-$TARGET)" &&
        cd "$BUILD_DIR" &&
        PATH=$NEW_PATH:$PATH &&
        run2 make -j$NUM_JOBS all &&
        run2 make -j$NUM_INSTALL_JOBS install
    )
    return $?
}

copy_target_gcc_libs ()
{
    local SRC_DIR DST_DIR
    dump "$(host_text)$(toolchain_text) Copying target GCC libraries"

    SRC_DIR="$(build_gcc_install_dir)/$TARGET"
    DST_DIR="$(host_gcc_install_dir)/$TARGET"

    run2 copy_directory "$SRC_DIR" "$DST_DIR"
}

build_host_gcc ()
{
    if [ "$SYSTEM" = "$BUILD_TAG" -a -z "$NO_TARGET_LIBS" ]; then
        # This is a regular-cross build, and we need to build the target GCC libraries.
        stamps_do gcc-all-$GCC_VERSION-$SYSTEM-$TOOLCHAIN build_target_gcc_libs
    else
        # This is a canadian-cross build, or we don't need the target GCC libraries.
        stamps_do gcc-core-$GCC_VERSION-$SYSTEM-$TOOLCHAIN build_host_gcc_core
    fi
}

# $1: host system tag (e.g. linux-x86)
# $2: toolchain name (e.g. x86-4.4.3)
build_gcc ()
{
    local SYSTEM=$1
    local TOOLCHAIN=$2

    # When performing canadian-cross builds, ensure we generate the
    # host toolchain first (even if we don't need target GCC libraries)
    if [ "$SYSTEM" != "$BUILD_TAG" ]; then
        build_gcc $BUILD_TAG $TOOLCHAIN
    fi

    # We do this both in the setup and build phase to ensure we perform
    # as many checks as possible before launching the (long) build procedure.
    setup_build_for_host $SYSTEM
    setup_build_for_toolchain $TOOLCHAIN

    if [ "$PHASE" = build ]; then
        stamps_do build-gcc-$SYSTEM-$TOOLCHAIN build_host_gcc
    fi
}

# $1: host system tag (e.g. linux-x86)
# $2: toolchain name (e.g. x86-4.4.3)
install_gcc ()
{
    local SYSTEM=$1
    local TOOLCHAIN=$2
    local BINUTILS_DIR GCC_DIR TARGET_LIBS_DIR INSTALL_DIR PROG

    build_gcc $SYSTEM $TOOLCHAIN

    dump "$(host_text)$(toolchain_text) Installing to NDK."

    BINUTILS_DIR=$(host_binutils_install_dir)
    GCC_DIR=$(host_gcc_install_dir)
    TARGET_LIBS_DIR=$(build_gcc_install_dir)
    INSTALL_DIR=$TOOLCHAIN_INSTALL_DIR

    # Copy binutils binaries
    run2 copy_directory "$BINUTILS_DIR/bin" "$INSTALL_DIR/bin" &&
    run2 copy_directory "$BINUTILS_DIR/$TARGET/lib" "$INSTALL_DIR/$TARGET/lib" &&

    # The following is used to copy the libbfd. See --enable-install-libbfd
    # which is set in build_host_binutils above.
    run2 copy_directory "$BINUTILS_DIR/$HOST/$TARGET/include" "$INSTALL_DIR/include" &&
    run2 copy_directory "$BINUTILS_DIR/$HOST/$TARGET/lib"     "$INSTALL_DIR/lib$(tag_to_bits $SYSTEM)" &&

    # Copy gcc core binaries
    run2 copy_directory "$GCC_DIR/bin" "$INSTALL_DIR/bin" &&
    run2 copy_directory "$GCC_DIR/lib/gcc/$TARGET" "$INSTALL_DIR/lib/gcc/$TARGET" &&
    run2 copy_directory "$GCC_DIR/libexec/gcc/$TARGET" "$INSTALL_DIR/libexec/gcc/$TARGET" &&

    # Copy target gcc libraries
    run2 copy_directory "$TARGET_LIBS_DIR/lib/gcc/$TARGET" "$INSTALL_DIR/lib/gcc/$TARGET"

    # We need to generate symlinks for the binutils binaries from
    # $INSTALL_DIR/$TARGET/bin/$PROG to $INSTALL_DIR/bin/$TARGET-$PROG
    mkdir -p "$INSTALL_DIR/$TARGET/bin" &&
    for PROG in $(cd $BINUTILS_DIR/$TARGET/bin && ls *); do
        (cd "$INSTALL_DIR/$TARGET/bin" && rm -f $PROG && ln -s ../../bin/$TARGET-$PROG $PROG)
        fail_panic
    done

    # Copy the license files
    local TOOLCHAIN_LICENSES="$ANDROID_NDK_ROOT"/build/tools/toolchain-licenses
    run cp -f "$TOOLCHAIN_LICENSES"/COPYING "$TOOLCHAIN_LICENSES"/COPYING.LIB "$INSTALL_DIR"
}

# $1: host system tag (e.g. linux-x86)
# $2: toolchain name (e.g. x86-4.4.3)
# $3: package directory.
package_gcc ()
{
    local SYSTEM=$1
    local TOOLCHAIN=$2
    local PACKAGE_DIR="$3"
    local PACKAGE_NAME="$TOOLCHAIN-$SYSTEM.tar.bz2"
    local PACKAGE_FILE="$PACKAGE_DIR/$PACKAGE_NAME"

    setup_build_for_toolchain $TOOLCHAIN

    dump "Packaging $PACKAGE_NAME."
    pack_archive "$PACKAGE_FILE" "$NDK_DIR" "$TOOLCHAIN_SUB_DIR"
}

setup_build

for PHASE in setup build; do
    for SYSTEM in $HOST_SYSTEMS; do
        setup_build_for_host $SYSTEM
        for TOOLCHAIN in $TOOLCHAINS; do
            build_gcc $SYSTEM $TOOLCHAIN
        done
    done
done

for SYSTEM in $HOST_SYSTEMS; do
    setup_build_for_host $SYSTEM
    for TOOLCHAIN in $TOOLCHAINS; do
        install_gcc $SYSTEM $TOOLCHAIN
    done
done

if [ "$PACKAGE_DIR" ]; then
    for SYSTEM in $HOST_SYSTEMS; do
        setup_build_for_host $SYSTEM
        for TOOLCHAIN in $TOOLCHAINS; do
            package_gcc $SYSTEM $TOOLCHAIN "$PACKAGE_DIR"
        done
    done
    echo "Done. See the content of $PACKAGE_DIR:"
    ls -l "$PACKAGE_DIR"
    echo ""
fi