fix build sdk on x86 systems

build/Gruntfile.js

 module.exports = function(grunt) {
-	require('google-closure-compiler').grunt(grunt, ['-Xms2048m']);
-    var defaultConfig, packageFile;
+	var defaultConfig, packageFile;
 	var path = grunt.option('src') || './configs';
 	var level = grunt.option('level') || 'ADVANCED';
 	var formatting = grunt.option('formatting') || '';
 
+	require('google-closure-compiler').grunt(grunt, ['ADVANCED' === level ? '-Xms2048m' : '-Xms1024m']);
+
 	grunt.loadNpmTasks('grunt-contrib-clean');
 	grunt.loadNpmTasks('grunt-contrib-concat');
 	grunt.loadNpmTasks('grunt-replace');
@@ -121,22 +122,22 @@ module.exports = function(grunt) {
 		});
 	});
 	
-	grunt.registerTask('compile_sdk_init', function(compilation_level) {
-		var sdkTmp = 'sdk-tmp.js'
+	grunt.registerTask('compile_sdk_init', function() {
+		var sdkTmp = 'sdk-tmp.js';
 		var splitLine = '';
 		var tmp_sdk_path = 'sdk-js-tmp.js';
 		var sdkDstFolder = packageFile['compile']['sdk']['dst'];
 		var sdkAllMinDst = sdkDstFolder + '/sdk-all-min.js';
 		var sdkAllDst = sdkDstFolder + '/sdk-all.js';
 		var sdkOpt = {
-			compilation_level: compilation_level,
+			compilation_level: level,
 			warning_level: 'QUIET',
 			externs: packageFile['compile']['sdk']['externs']
 		};
 		if (formatting) {
 			sdkOpt['formatting'] = formatting;
 		}
-		if ('ADVANCED' === compilation_level) {
+		if ('ADVANCED' === level) {
 			splitLine = ('PRETTY_PRINT' === formatting) ? 'window.split = "split";' : 'window.split="split";';
 		} else {
 			splitLine = ('PRETTY_PRINT' === formatting) ? 'window["split"] = "split";' : 'window["split"]="split";';
@@ -191,6 +192,6 @@ module.exports = function(grunt) {
 	});
 	
 	grunt.registerTask('concat_sdk', ['concat_sdk_init', 'concat', 'clean']);
-	grunt.registerTask('compile_sdk', ['concat_sdk', 'compile_sdk_init:' + level, 'closure-compiler', 'splitfile', 'concat', 'replace', 'clean']);
+	grunt.registerTask('compile_sdk', ['concat_sdk', 'compile_sdk_init', 'closure-compiler', 'splitfile', 'concat', 'replace', 'clean']);
 	grunt.registerTask('default', ['build_all']);
 };
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