Bug 923: Remove dependency of CStruct annotation processor _generation_ and generated_class_user due to Java8 issues.

Java8's annotation processor as embedded within javac does not allow
referencing not-yet existing generated classes in a class source code
which will produce these generated classes via the annotation process.

Example:

+++
import com.jogamp.gluegen.structgen.CStruct;

public class Lala {
  @CStruct(name="RenderingConfig", header="TestStruct01.h")
  public RenderingConfig config;
}
+++

Above example illustrates that the type 'RenderingConfig'
does not exist at time of processing the annotation.
The type will be created via the annotation process itself.

Even though we pass '-proc:only', i.e. skip java compilation,
Java8's annotation processing via javac fails in such case.

We see this as a bug within javac's annotation processing itself!

+++

This workaround splits the annotation process and using the class as
generated by the former.

To allow this to work, CStruct receives a new field 'jname'
allowing to enforce the java-name of the structure
using a dummy field type like boolean.

  @CStruct(name="RenderingConfig", jname="RenderingConfig", header="TestStruct01.h")
  public boolean dummy;

Further more CStruct can be annotated on the package, i.e. 'package-info.java',
avoiding the dependency problem altogether.
To support multiple header files and types,
'CStructs' has been introduced using an array of 'CStruct'.

  @CStructs({@CStruct(name="RenderingConfig", header="TestStruct01.h"), @CStruct(name="Pixel", header="TestStruct02.h")})
  package com.jogamp.gluegen.test.junit.structgen;

Tests:
  - Build w/ Java7 and Java8
  - Validated 'major version 50' (Java 6) class files (OK)

1 files changed, 19 insertions, 2 deletions

diff --git a/make/build-test.xml b/make/build-test.xml
index bccc534..2bf2e37 100644
--- a/make/build-test.xml
+++ b/make/build-test.xml
@@ -114,7 +114,23 @@
         <echo message=" test.base.dir ${test.base.dir}"/>
         <echo message=" build_t.gen     ${build_t.gen}"/>
 
-        <!-- Annotation Processor Only - First -->
+        <!-- Javac of Annotation Processor dependencies - First -->
+        <javac destdir="${build_t.java}" 
+               fork="yes"
+               includeAntRuntime="false"
+               memoryMaximumSize="${javac.memorymax}"
+               encoding="UTF-8"
+               source="${target.sourcelevel}" 
+               target="${target.targetlevel}" 
+               bootclasspath="${target.rt.jar}"
+               debug="${javacdebug}" debuglevel="${javacdebuglevel}">
+            <classpath refid="junit.compile.classpath"/>
+            <compilerarg value="-proc:none"/>
+            <src path="${test.base.dir}/com/jogamp/junit/util"/>
+        </javac>
+
+        <!-- Annotation Processor - Second -->
+        <mkdir dir="${build_t.gen}/classes/com/jogamp/gluegen/test/junit/structgen"/>
         <javac destdir="${build_t.java}" 
                fork="yes"
                includeAntRuntime="false"
@@ -129,9 +145,10 @@
             <compilerarg value="-J-Djogamp.gluegen.structgen.debug"/>
             <compilerarg value="-J-Djogamp.gluegen.structgen.output=${build_t.gen}/classes"/>
             <src path="${test.base.dir}/com/jogamp/gluegen/test/junit/structgen"/>
+            <src path="${build_t.gen}/classes/com/jogamp/gluegen/test/junit/structgen" />
         </javac>
 
-        <!-- Javac Only - Second -->
+        <!-- Javac All - Third -->
         <javac destdir="${build_t.java}" 
                fork="yes"
                includeAntRuntime="false"