build(core): Move custom ant tasks to build-definitions.xml

Partially from
LWJGL@8fd5f8d

This stops `BindingConfig` from being called repeatedly when chaining
tasks like we do in `ci_build_android.bash` which causes issues as it
sets `-Dbinding.core=true` after hardcoding its inclusion in the modules
list. This causes `core` to duplicate at the end of the property
`module.list` (because BindingConfig has no deduplciation logic for
that) which messes with `ModuleInfoGen` as it tries to move a file it
already moved before, that being the `module-info.class` file for
`core`.

Author: alexytomi

build.xml

@@ -27,22 +27,6 @@
 
         <mkdir-symlink dir="bin"/>
 
-        <!-- Compile custom Ant tasks -->
-        <mkdir dir="${bin.ant}"/>
-        <lwjgl.javac
-            destdir="${bin.ant}"
-            classpath="${ant.core.lib}"
-
-            srcdir="${src.ant}/java"
-            includes="org/lwjgl/**"
-
-            taskname="javac: Custom Ant Tasks"
-        />
-
-        <taskdef name="logLevel" classname="org.lwjgl.SetLogLevel" classpath="${bin.ant}"/>
-        <taskdef name="bindingConfig" classname="org.lwjgl.BindingConfig" classpath="${bin.ant}"/>
-        <bindingConfig/>
-
         <ant antfile="update-dependencies.xml" target="check-dependencies" inheritAll="false"/>
 
         <taskdef resource="org/jetbrains/kotlin/ant/antlib.xml" classpath="${kotlinc}/lib/kotlin-ant.jar"/>

config/build-definitions.xml

@@ -9,6 +9,27 @@ Defines global properties and useful macros.
 This script is included in /build.xml and /config/update-dependencies.xml.
 -->
 <project name="definitions" basedir="../" xmlns:if="ant:if" xmlns:unless="ant:unless">
+    <property name="bin.ant" location="bin/classes/ant" relative="true"/>
+
+    <!-- Compile custom Ant tasks -->
+    <mkdir dir="bin/classes/ant"/>
+    <javac
+        sourcepath="" debug="yes" source="8" target="8" encoding="UTF-8" includeantruntime="false" nowarn="true"
+
+        destdir="bin/classes/ant"
+        classpath="${ant.core.lib}"
+
+        srcdir="modules/ant/src/main/java"
+        includes="org/lwjgl/**"
+
+        taskname="javac: Custom Ant Tasks"
+    />
+
+    <!-- Define custom Ant tasks -->
+    <taskdef name="logLevel" classname="org.lwjgl.SetLogLevel" classpath="${bin.ant}"/>
+    <taskdef name="bindingConfig" classname="org.lwjgl.BindingConfig" classpath="${bin.ant}"/>
+    <bindingConfig/>
+
     <property environment="env"/>
 
     <!--
@@ -88,7 +109,6 @@ This script is included in /build.xml and /config/update-dependencies.xml.
 
     <property name="test.resources" location="modules/samples/src/test/resources" relative="true"/>
 
-    <property name="bin.ant" location="bin/classes/ant" relative="true"/>
     <property name="bin.extract" location="bin/classes/extract" relative="true"/>
     <property name="bin.generator" location="bin/classes/generator" relative="true"/>
     <property name="bin.javadoc" location="bin/javadoc" relative="true"/>

modules/ant/src/main/java/org/lwjgl/DetectJDKVersion.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright LWJGL. All rights reserved.
+ * License terms: https://www.lwjgl.org/license
+ */
+package org.lwjgl;
+
+import org.apache.tools.ant.*;
+
+import java.util.regex.*;
+
+public class DetectJDKVersion extends Task {
+
+    @Override public void execute() {
+
+        String javaVersion = System.getProperty("java.version");
+
+        Matcher matcher = Pattern
+            .compile("^([1-9][0-9]*)(?:(?:\\.0)*\\.[1-9][0-9]*)*(?:-[a-zA-Z0-9]+)?")
+            .matcher(javaVersion);
+
+        if (!matcher.find()) {
+            if (javaVersion.startsWith("1.")) {
+                if (!javaVersion.startsWith("1.8.")) {
+                    throw new BuildException("JDK 8 or newer is required.");
+                }
+                return;
+            }
+            throw new BuildException("Failed to parse java.version: " + javaVersion);
+        }
+
+        int version = Integer.parseInt(matcher.group(1));
+
+        Project LWJGL = getProject();
+        for (int v = version; 9 <= v; v--) {
+            LWJGL.setProperty("jdk" + v, "true");
+        }
+    }
+
+}