Toolchain: Add x86_64 cross compiler build script

Author: https://github.com/Quaker762
Commit: https://github.com/SerenityOS/serenity/commit/2af5b700b0f
Pull-request: https://github.com/SerenityOS/serenity/pull/1317
Reviewed-by: https://github.com/awesomekling

Toolchain/BuildIt_x86_64.sh

@@ -0,0 +1,165 @@
+#!/usr/bin/env bash
+set -e
+
+# This file will need to be run in bash, for now.
+
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+echo "$DIR"
+
+ARCH=${ARCH:-"x86_64"}
+TARGET="$ARCH-pc-serenity"
+PREFIX="$DIR/Local/x86_64"
+SYSROOT="$DIR/../Root"
+
+MAKE=make
+MD5SUM=md5sum
+NPROC=nproc
+
+if [ `uname -s` = "OpenBSD" ]; then
+    MAKE=gmake
+    MD5SUM="md5 -q"
+    NPROC="sysctl -n hw.ncpuonline"
+    export CC=egcc
+    export CXX=eg++
+    export with_gmp=/usr/local
+    export LDFLAGS=-Wl,-z,notext
+fi
+
+echo PREFIX is "$PREFIX"
+echo SYSROOT is "$SYSROOT"
+
+mkdir -p "$DIR/Tarballs"
+
+BINUTILS_VERSION="2.33.1"
+BINUTILS_MD5SUM="1a6b16bcc926e312633fcc3fae14ba0a"
+BINUTILS_NAME="binutils-$BINUTILS_VERSION"
+BINUTILS_PKG="${BINUTILS_NAME}.tar.gz"
+BINUTILS_BASE_URL="http://ftp.gnu.org/gnu/binutils"
+
+GCC_VERSION="9.2.0"
+GCC_MD5SUM="e03739b042a14376d727ddcfd05a9bc3"
+GCC_NAME="gcc-$GCC_VERSION"
+GCC_PKG="${GCC_NAME}.tar.gz"
+GCC_BASE_URL="http://ftp.gnu.org/gnu/gcc"
+
+pushd "$DIR/Tarballs"
+    md5="$($MD5SUM $BINUTILS_PKG | cut -f1 -d' ')"
+    echo "bu md5='$md5'"
+    if [ ! -e $BINUTILS_PKG ] || [ "$md5" != ${BINUTILS_MD5SUM} ] ; then
+        rm -f $BINUTILS_PKG
+        wget "$BINUTILS_BASE_URL/$BINUTILS_PKG"
+    else
+        echo "Skipped downloading binutils"
+    fi
+
+    md5="$($MD5SUM ${GCC_PKG} | cut -f1 -d' ')"
+    echo "gc md5='$md5'"
+    if [ ! -e $GCC_PKG ] || [ "$md5" != ${GCC_MD5SUM} ] ; then
+        rm -f $GCC_PKG
+        wget "$GCC_BASE_URL/$GCC_NAME/$GCC_PKG"
+    else
+        echo "Skipped downloading gcc"
+    fi
+
+    if [ ! -d ${BINUTILS_NAME} ]; then
+        echo "Extracting binutils..."
+        tar -xzf ${BINUTILS_PKG}
+
+        pushd ${BINUTILS_NAME}
+            git init >/dev/null
+            git add . >/dev/null
+            git commit -am "BASE" >/dev/null
+            git apply "$DIR"/Patches/binutils.patch >/dev/null
+        popd
+    else
+        echo "Skipped extracting binutils"
+    fi
+
+    if [ ! -d $GCC_NAME ]; then
+        echo "Extracting gcc..."
+        tar -xzf $GCC_PKG
+
+        pushd $GCC_NAME
+            git init >/dev/null
+            git add . >/dev/null
+            git commit -am "BASE" >/dev/null
+            git apply "$DIR"/Patches/gcc.patch >/dev/null
+        popd
+    else
+        echo "Skipped extracting gcc"
+    fi
+
+    if [ "$(uname)" = "Darwin" ]; then
+        pushd "gcc-${GCC_VERSION}"
+        ./contrib/download_prerequisites
+        popd
+    fi
+
+popd
+
+mkdir -p "$PREFIX"
+
+mkdir -p "$DIR/Build/x86_64/binutils"
+mkdir -p "$DIR/Build/x86_64/gcc"
+
+if [ -z "$MAKEJOBS" ]; then
+    MAKEJOBS=$($NPROC)
+fi
+
+pushd "$DIR/Build/x86_64"
+    unset PKG_CONFIG_LIBDIR # Just in case
+
+    pushd binutils
+        rm -f ./config.cache # Let's do this in case someone has already built the i686 version
+        "$DIR"/Tarballs/binutils-2.33.1/configure --prefix="$PREFIX" \
+                                                --target="$TARGET" \
+                                                --with-sysroot="$SYSROOT" \
+                                                --enable-shared \
+                                                --disable-nls || exit 1
+        if [ "$(uname)" = "Darwin" ]; then
+            # under macOS generated makefiles are not resolving the "intl"
+            # dependency properly to allow linking its own copy of
+            # libintl when building with --enable-shared.
+            "$MAKE" -j "$MAKEJOBS" || true
+            pushd intl
+            "$MAKE" all-yes
+            popd
+        fi
+        "$MAKE" -j "$MAKEJOBS" || exit 1
+        "$MAKE" install || exit 1
+    popd
+
+    pushd gcc
+        if [ `uname -s` = "OpenBSD" ]; then
+            perl -pi -e 's/-no-pie/-nopie/g' "$DIR"/Tarballs/gcc-9.2.0/gcc/configure
+        fi
+
+        "$DIR"/Tarballs/gcc-9.2.0/configure --prefix="$PREFIX" \
+                                            --target="$TARGET" \
+                                            --with-sysroot="$SYSROOT" \
+                                            --disable-nls \
+                                            --with-newlib \
+                                            --enable-shared \
+                                            --enable-languages=c,c++ || exit 1
+
+        echo "XXX build gcc and libgcc"
+        "$MAKE" -j "$MAKEJOBS" all-gcc all-target-libgcc || exit 1
+        echo "XXX install gcc and libgcc"
+        "$MAKE" install-gcc install-target-libgcc || exit 1
+
+        echo "XXX serenity libc and libm"
+        ( cd "$DIR/../Libraries/LibC/" && "$MAKE" clean && "$MAKE" EXTRA_LIBC_DEFINES="-DBUILDING_SERENITY_TOOLCHAIN" && "$MAKE" install )
+        ( cd "$DIR/../Libraries/LibM/" && "$MAKE" clean && "$MAKE" && "$MAKE" install )
+
+        echo "XXX build libstdc++"
+        "$MAKE" all-target-libstdc++-v3 || exit 1
+        echo "XXX install libstdc++"
+        "$MAKE" install-target-libstdc++-v3 || exit 1
+
+        if [ `uname -s` = "OpenBSD" ]; then
+            cd "$DIR"/Local/libexec/gcc/x86_64-pc-serenity/9.2.0 && ln -sf liblto_plugin.so.0.0 liblto_plugin.so
+        fi
+    popd
+popd
+