Bug 1024: Add fallback for native-jar-file location via classpath

In situations, where the native-jar file is not located within
the same parent URI as it's java-jar file, our location mechanism fails.

This patch adds a classloader based native-jar file location mechanism as a fallback,
requiring the native jar file to be included in the users CLASSPATH.

Classloader based location algorithm in JNILibLoaderBase.addNativeJarLibsImpl(..):
  - Extract the 'module-name' from the given classFromJavaJar's package name,
    i.e. the last package-part: 'jogamp.common.Debug' -> 'common'

    Hence it is important to pass a 'classFromJavaJar',
    which last package segment reflects the module-name!

  - <os.and.arch> -> <os_and_arch_dot>, e.g. linux-amd64 -> linux.amd64 (linux/amd64)

  - Locate class 'jogamp.nativetag.<module-name>.<os_and_arch_dot>.TAG',
    e.g. 'jogamp.nativetag.common.linux.amd64.TAG'

  - Use located class's JarFile URI .. continue as usual

Injection of above mentioned TAG class via gluegen-cpptasks-base.xml macro 'native.tag.jar':
  - Creates dummy TAG.java code
  - Compiles TAG.java
  - Creates the native-jar file

Example:
      <native.tag.jar objdir="${build}/obj"
                      nativejarfile="${build}/gluegen-rt-natives-${os.and.arch}.jar"
                      manifestfile="${build}/Manifest-rt-natives.temp"
                      module="common"
                      includelibs="*gluegen-rt.${native.library.suffix}" />

Note that the manifest file uses a matching Extension-Name:
  Extension-Name: jogamp.nativetag.common

1 files changed, 10 insertions, 9 deletions

diff --git a/make/build.xml b/make/build.xml
index 0df5cf6..534f122 100644
--- a/make/build.xml
+++ b/make/build.xml
@@ -484,11 +484,12 @@
 
       <antcall target="c.manifest" inheritRefs="true" />
 
-      <jar destfile="${build}/gluegen-rt-natives-${os.and.arch}.jar" manifest="${build}/Manifest-rt-natives.temp">
-        <fileset dir="${build}/obj">
-          <include name="*gluegen-rt.${native.library.suffix}" />
-        </fileset>
-      </jar>
+      <native.tag.jar objdir="${build}/obj"
+                      nativejarfile="${build}/gluegen-rt-natives-${os.and.arch}.jar"
+                      manifestfile="${build}/Manifest-rt-natives.temp" 
+                      module="common"
+                      includelibs="*gluegen-rt.${native.library.suffix}" />
+
       <!-- Produce duplicates for different configurations, since non-native-jar aliasing (Bug 1023/Bug 1024) -->
       <copy file="${build}/gluegen-rt-natives-${os.and.arch}.jar" tofile="${build}/gluegen-rt-android-natives-${os.and.arch}.jar"/>
     </target>  
@@ -752,7 +753,7 @@
     </copy>
 
     <!-- Build gluegen.jar. -->
-    <jar destfile="${build}/gluegen.jar" manifest="${build}/Manifest.temp">
+    <jar destfile="${build}/gluegen.jar" manifest="${build}/Manifest.temp" filesonly="true">
       <service type="javax.annotation.processing.Processor">
         <provider classname="com.jogamp.gluegen.structgen.CStructAnnotationProcessor"/>
       </service>
@@ -805,7 +806,7 @@
     </copy>
 
     <!-- Build gluegen-rt.jar. -->
-    <jar destfile="${build}/gluegen-rt.jar" manifest="${build}/Manifest-rt.temp">
+    <jar destfile="${build}/gluegen-rt.jar" manifest="${build}/Manifest-rt.temp" filesonly="true">
       <fileset dir="${classes}">
         <include name="com/jogamp/gluegen/runtime/*.class" />
         <include name="com/jogamp/common/**" />
@@ -880,7 +881,7 @@
     </copy>
 
     <!-- Build gluegen-rt-android.jar. -->
-    <jar destfile="${build}/gluegen-rt-android.jar" manifest="${build}/Manifest-rt-android.temp">
+    <jar destfile="${build}/gluegen-rt-android.jar" manifest="${build}/Manifest-rt-android.temp" filesonly="true">
       <fileset dir="${classes}">
         <include name="com/jogamp/gluegen/runtime/*.class" />
         <include name="com/jogamp/common/**" />
@@ -938,7 +939,7 @@
         </filterset>
     </copy>
 
-    <jar destfile="${build}/jogamp-android-launcher.jar" manifest="${build}/Manifest-android-launcher.temp">
+    <jar destfile="${build}/jogamp-android-launcher.jar" manifest="${build}/Manifest-android-launcher.temp" filesonly="true">
       <fileset dir="${classes}">
         <include name="${jogamp-android-launcher.classes}" />
       </fileset>