Add a toolchain for toolchain building

kotlin-native/tools/toolchain_builder/build_toolchain.sh

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+set -eou pipefail
+
+TARGET=$1
+VERSION=$2
+HOME=/home/ct
+ZLIB_VERSION=1.2.11
+
+build_toolchain() {
+  mkdir $HOME/build-$TARGET
+  cd $HOME/build-$TARGET
+  cp $HOME/toolchains/$TARGET/$VERSION.config .config
+  ct-ng build
+  cd ..
+}
+
+build_zlib() {
+  TOOLCHAINS_PATH=$HOME/x-tools
+  INSTALL_PATH=$TOOLCHAINS_PATH/$TARGET/$TARGET/sysroot/usr
+  TOOLCHAIN_BIN_PREFIX=$TOOLCHAINS_PATH/$TARGET/bin/$TARGET
+  cd $HOME/zlib-$ZLIB_VERSION
+
+  CHOST=$TARGET \
+  CC=$TOOLCHAIN_BIN_PREFIX-gcc \
+  AR=$TOOLCHAIN_BIN_PREFIX-ar \
+  RANLIB=$TOOLCHAIN_BIN_PREFIX-ranlib \
+  ./configure \
+  --prefix=$INSTALL_PATH
+
+  make && make install
+}
+
+build_archive() {
+  cd $HOME/x-tools
+  FULL_NAME=$TARGET-$VERSION
+  mv $TARGET $FULL_NAME
+  ARCHIVE_NAME="$FULL_NAME.tar.xz"
+  tar -czvf $ARCHIVE_NAME $FULL_NAME
+  cp $ARCHIVE_NAME /artifacts/$ARCHIVE_NAME
+}
+
+echo "building toolchain for $TARGET"
+
+build_toolchain
+build_zlib
+build_archive