fix alignment on osx/ppc

src/com/sun/jna/Native.java

@@ -124,6 +124,7 @@ public final class Native implements Version {
     private static final int TYPE_WCHAR_T = 2;
     private static final int TYPE_SIZE_T = 3;
 
+    static final int MAX_ALIGNMENT;
     static final int MAX_PADDING;
 
     static {
@@ -153,10 +154,12 @@ public final class Native implements Version {
                             + " - set jna.boot.library.path to include the path to the version of the " + LS
                             + "   jnidispatch library included with the JNA jar file you are using" + LS);
         }
-	MAX_PADDING = Platform.isSPARC() || Platform.isWindows() || Platform.isARM()
-            || Platform.isAIX() || Platform.isAndroid()
-            || Platform.isPPC()
+	MAX_ALIGNMENT = Platform.isSPARC() || Platform.isWindows()
+            || (Platform.isLinux() && (Platform.isARM() || Platform.isPPC()))
+            || Platform.isAIX()
+            || Platform.isAndroid()
             ? 8 : LONG_SIZE;
+        MAX_PADDING = (Platform.isMac() && Platform.isPPC()) ? 8 : MAX_ALIGNMENT;
     }
 
     /** Force a dispose when this class is GC'd. */

src/com/sun/jna/Structure.java

@@ -1301,7 +1301,7 @@ public abstract class Structure {
             // NOTE this is published ABI for 32-bit gcc/linux/x86, osx/x86,
             // and osx/ppc.  osx/ppc special-cases the first element
             if (!isFirstElement || !(Platform.isMac() && Platform.isPPC())) {
-                alignment = Math.min(Native.MAX_PADDING, alignment);
+                alignment = Math.min(Native.MAX_ALIGNMENT, alignment);
             }
             if (!isFirstElement && Platform.isAIX() && (type == double.class || type == Double.class)) {
                 alignment = 4;

test/com/sun/jna/StructureTest.java

@@ -158,7 +158,7 @@ public class StructureTest extends TestCase {
         }
         Structure s = new TestStructure();
         s.setAlignType(Structure.ALIGN_GNUC);
-        final int SIZE = Native.MAX_PADDING == 8 ? 32 : 28;
+        final int SIZE = Native.MAX_ALIGNMENT == 8 ? 32 : 28;
         assertEquals("Wrong structure size", SIZE, s.size());
     }