Add new 'listfiles' attribute to allow for listing the source files being

handed off to the compiler.
PR:
Obtained from:
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git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@271591 13f79535-47bb-0310-9956-ffa450edef68

WHATSNEW

@@ -176,6 +176,9 @@ Other changes:
 
 * you can now specify the -sourcepath for <javac> explicitly.
 
+* <javac> now supports a new "listfiles" attribute to list the source
+  files it's handing off to the compiler.
+
 * The compiler implementation for javac can now be chosen on a task by
   task basis.  Use the new compiler attribute of <javac> to override
   the build.compiler property.

src/main/org/apache/tools/ant/taskdefs/Javac.java

@@ -136,6 +136,7 @@ public class Javac extends MatchingTask {
     private Vector implementationSpecificArgs = new Vector();
 
     protected boolean failOnError = true;
+    protected boolean listFiles = false;
     protected File[] compileList = new File[0];
 
     private String source;
@@ -370,6 +371,18 @@ public class Javac extends MatchingTask {
         return extdirs.createPath();
     }
 
+    /**
+     * List the source files being handed off to the compiler
+     */
+    public void setListfiles(boolean list) {
+        listFiles = list;
+    }
+
+    /** Get the listfiles flag. */
+    public boolean getListfiles() {
+        return listFiles;
+    }
+
     /**
      * Throw a BuildException if compilation fails
      */
@@ -806,6 +819,14 @@ public class Javac extends MatchingTask {
                 + (compileList.length == 1 ? "" : "s")
                 + (destDir != null ? " to " + destDir : ""));
 
+            if (listFiles) {
+                for (int i=0 ; i < compileList.length ; i++)
+                {
+                  String filename = compileList[i].getAbsolutePath();
+                  log(filename) ;
+                }
+            }
+
             CompilerAdapter adapter = 
                 CompilerAdapterFactory.getCompiler(compilerImpl, this);