[scripts] Extend Zero-interpreter support

Author: JakubVanek

README.md

@@ -26,10 +26,12 @@ otherwise the build would get discarded. The final build needs at least 6.5 GB o
 ```
 sudo docker run --rm -it -v <path on host, where the sources should be stored>:/build ev3dev-lang-java:jdk-build
 ```
-4. Select the OpenJDK version you want to cross-compile:
+4. Select the OpenJDK version you want to cross-compile (select only one):
 ```
-export JDKVER=9
-export JDKVER=10
+export JDKVER=9      # OpenJDK 9 with ARM32 JIT
+export JDKVER=9zero  # OpenJDK 9 with Zero interpreter
+export JDKVER=10     # OpenJDK 10 with ARM32 JIT
+export JDKVER=10zero # OpenJDK 10 with Zero interpreter
 ```
 5. Before we can start the build process, Boot JDK must be downloaded:
 ```

scripts/config.sh

@@ -53,21 +53,29 @@ LEJOSEND="-final"
 #LEJOS_NAME=openjdk9-jri
 
 # OpenJDK 9
-if [ "$JDKVER" -eq "9" ]; then
+if [ "$JDKVER" -eq "9" ] || [ "$JDKVER" -eq "9zero" ]; then
   JAVA_REPO="http://hg.openjdk.java.net/jdk-updates/jdk9u/"
   PATCHVER="jdk9"
   AUTOGEN_PATH="./common/autoconf/autogen.sh"
-  HOTSPOT_VARIANT=client
+  if [ "$JDKVER" -eq "9zero" ]; then
+    HOTSPOT_VARIANT=zero
+  else
+    HOTSPOT_VARIANT=client
+  fi
   HOSTJDK="$BUILDDIR/jdk-9.0.4"
   HOSTJDK_FILE="$BUILDDIR/openjdk-9.0.4_linux-x64_bin.tar.gz"
   HOSTJDK_URL="https://download.java.net/java/GA/jdk9/9.0.4/binaries/openjdk-9.0.4_linux-x64_bin.tar.gz"
 
 # OpenJDK 10
-elif [ "$JDKVER" -eq "10" ]; then
+elif [ "$JDKVER" -eq "10" ] || [ "$JDKVER" -eq "10zero" ]; then
   JAVA_REPO="http://hg.openjdk.java.net/jdk-updates/jdk10u/"
   PATCHVER="jdk10"
   AUTOGEN_PATH="./make/autoconf/autogen.sh"
-  HOTSPOT_VARIANT=client
+  if [ "$JDKVER" -eq "10zero" ]; then
+    HOTSPOT_VARIANT=zero
+  else
+    HOTSPOT_VARIANT=client
+  fi
   HOSTJDK="$BUILDDIR/jdk-10"
   HOSTJDK_FILE="$BUILDDIR/openjdk-10_linux-x64_bin.tar.gz"
   HOSTJDK_URL="https://download.java.net/java/GA/jdk10/10/binaries/openjdk-10_linux-x64_bin.tar.gz"