add autoscaler and build for go code

src/tools/go_build

@@ -0,0 +1,102 @@
+#!/bin/sh
+
+if [ "x$DEBUG" = "x" ]; then
+    :
+else
+    set -x
+fi
+
+if [ "x$BUILDTYPE" = "xdebug" ]; then
+    CGO_CFLAGS="$CGO_CFLAGS -DWITH_DEBUG=1 -Og -ggdb "
+    CGO_LDFLAGS="$CGO_LDFLAGS -Og -ggdb "
+    GO_FLAGS=' -gcflags "all=-N -l"'
+
+    export CGO_CFLAGS CGO_LDFLAGS GO_FLAGS
+fi
+
+fix_env() {
+    local _n _x _cmd _v
+
+    _n="$1"
+    shift
+    _cmd="sed "
+    for _x in $*; do
+        _v=$(eval $(echo "echo \$$_x") | sed -s 's@"@@g')
+        _cmd="$_cmd -e s|@$_x@|$_v|g "
+    done
+    _v=$(eval $(echo "echo \$$_n"))
+    _cmd="$_n=\"$(echo $_v | $_cmd)\"; export $_n"
+    eval "$_cmd"
+}
+
+# fix value of environment variable by realpath
+# of it
+fix_input_envs() {
+    local _n _v _cmd
+
+    for _n in CURRENT_SOURCE_DIR BUILD_ROOT; do
+        _v=$(eval $(echo "echo \$$_n") | sed -e 's@"@@g')
+        _v=$(realpath $_v)
+        _cmd="$_n=$_v; export $_n"
+        eval "$_cmd"
+    done
+}
+
+# fix dependencies, by:
+#  for math just add -lmath
+#  for thread by add -pthread
+#  otherwise using
+#     pkg-config --cflags/ pkg-config --libs
+fix_dependencies() {
+    local _x _cflags _ldflags
+
+    for _x in $DEPENDENCIES; do
+        case "$_x" in
+            math)
+                _cflags=""
+                _ldflags="-lm"
+                ;;
+            thread)
+                _cflags="-pthread"
+                _ldflags="-pthread"
+                ;;
+            *)
+                _cflags=$(pkg-config --cflags "$_x")
+                _ldflags=$(pkg-config --libs "$_x")
+                ;;
+        esac
+        
+        CGO_CFLAGS="$CGO_CFLAGS $_cflags"
+        CGO_LDFLAGS="$CGO_LDFLAGS $_ldflags"
+    done
+
+    export CGO_CFLAGS CGO_LDFLAGS
+}
+
+if [ "$#" -ne 2 ]; then
+    echo go_build sfile dest
+    exit 1
+fi
+
+_sfile=$(realpath "$1")
+_sdir=$(dirname "$_sfile")
+_dfile=$(realpath "$2")
+
+fix_input_envs
+fix_dependencies
+
+if [ -z "$HOME" -o ! -w "$HOME" ]; then
+    HOME=$TMPDIR
+    export HOME
+fi
+
+export GOCACHE=$TMPDIR/go-cache
+export GOPATH="$TMPDIR/go"
+
+for _n in $FIX_ENVARS; do
+    fix_env $_n $ENVARS;
+done
+
+export GOPROXY=https://goproxy.cn
+
+(cd $_sdir; go build -gcflags "all=-N -l" -o "$_dfile" "$_sfile")