--- a/make/CompileJavaModules.gmk	Thu Jan 28 09:43:04 2016 -0800
+++ b/make/CompileJavaModules.gmk	Wed Jul 05 21:16:42 2017 +0200
@@ -42,7 +42,7 @@
 
 ################################################################################
 
-java.base_ADD_JAVAC_FLAGS := -Xdoclint:all/protected,-reference '-Xdoclint/package:java.*,javax.*'
+java.base_ADD_JAVAC_FLAGS := -Xdoclint:all/protected,-reference '-Xdoclint/package:java.*,javax.*' -XDstringConcat=inline
 java.base_COPY := .icu .dat .spp content-types.properties hijrah-config-islamic-umalqura.properties
 java.base_CLEAN := intrinsic.properties
 
@@ -359,7 +359,7 @@
 
 ################################################################################
 
-jdk.compiler_ADD_JAVAC_FLAGS := -Xdoclint:all/protected '-Xdoclint/package:-com.sun.tools.*'
+jdk.compiler_ADD_JAVAC_FLAGS := -Xdoclint:all/protected '-Xdoclint/package:-com.sun.tools.*' -XDstringConcat=inline
 jdk.compiler_COPY := javax.tools.JavaCompilerTool
 jdk.compiler_CLEAN_FILES := $(wildcard \
     $(patsubst %, $(JDK_TOPDIR)/src/jdk.compiler/share/classes/%/*.properties, \