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diff --git a/src/main/java/net/sf/antcontrib/cpptasks/compiler/AbstractProcessor.java b/src/main/java/net/sf/antcontrib/cpptasks/compiler/AbstractProcessor.java
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+++ b/src/main/java/net/sf/antcontrib/cpptasks/compiler/AbstractProcessor.java
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+/*
+ * 
+ * Copyright 2002-2004 The Ant-Contrib project
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package net.sf.antcontrib.cpptasks.compiler;
+import org.apache.tools.ant.types.Environment;
+/**
+ * An abstract processor (compiler/linker) implementation.
+ * 
+ * @author Curt Arnold
+ */
+public abstract class AbstractProcessor implements Processor, Cloneable {
+    /**
+     * default bid for a file name that the processor recognizes but does not
+     * process and does not want to fall through to the linker
+     */
+    public final static int DEFAULT_DISCARD_BID = 1;
+    /**
+     * default bid for a file name that the processor desires to process
+     */
+    public final static int DEFAULT_PROCESS_BID = 100;
+    /**
+     * Determines the identification of a command line processor by capture the
+     * first line of its output for a specific command.
+     * 
+     * @param command
+     *            array of command line arguments starting with executable
+     *            name. For example, { "cl" }
+     * @param fallback
+     *            start of identifier if there is an error in executing the
+     *            command
+     * @return identifier for the processor
+     */
+    protected static String getIdentifier(String[] command, String fallback) {
+        String identifier = fallback;
+        try {
+            String[] cmdout = CaptureStreamHandler.run(command);
+            if (cmdout.length > 0) {
+                identifier = cmdout[0];
+            }
+        } catch (Throwable ex) {
+            identifier = fallback + ":" + ex.toString();
+        }
+        return identifier;
+    }
+    private final String[] headerExtensions;
+    private final String[] sourceExtensions;
+    protected AbstractProcessor(String[] sourceExtensions,
+            String[] headerExtensions) {
+        this.sourceExtensions = (String[]) sourceExtensions.clone();
+        this.headerExtensions = (String[]) headerExtensions.clone();
+    }
+    /**
+     * Returns the bid of the processor for the file.
+     * 
+     * @param inputFile
+     *            filename of input file
+     * @return bid for the file, 0 indicates no interest, 1 indicates that the
+     *         processor recognizes the file but doesn't process it (header
+     *         files, for example), 100 indicates strong interest
+     */
+    public int bid(String inputFile) {
+        String lower = inputFile.toLowerCase();
+        for (int i = 0; i < sourceExtensions.length; i++) {
+            if (lower.endsWith(sourceExtensions[i])) {
+                return DEFAULT_PROCESS_BID;
+            }
+        }
+        for (int i = 0; i < headerExtensions.length; i++) {
+            if (lower.endsWith(headerExtensions[i])) {
+                return DEFAULT_DISCARD_BID;
+            }
+        }
+        return 0;
+    }
+    public Processor changeEnvironment(boolean newEnvironment, Environment env) {
+        return this;
+    }
+    protected Object clone() throws CloneNotSupportedException {
+        return super.clone();
+    }
+    public String[] getHeaderExtensions() {
+        return (String[]) this.headerExtensions.clone();
+    }
+    abstract public String getIdentifier();
+    /**
+     * Gets the target operating system architecture
+     * 
+     * @return String target operating system architecture
+     */
+    protected String getOSArch() {
+        return System.getProperty("os.arch");
+    }
+    /**
+     * Gets the target operating system name
+     * 
+     * @return String target operating system name
+     */
+    protected String getOSName() {
+        return System.getProperty("os.name");
+    }
+    public String[] getSourceExtensions() {
+        return (String[]) this.sourceExtensions.clone();
+    }
+    /**
+     * Returns true if the target operating system is Mac OS X or Darwin.
+     * 
+     * @return boolean
+     */
+    protected boolean isDarwin() {
+        String osName = getOSName();
+        return "Mac OS X".equals(osName);
+    }
+    public final String toString() {
+        return getIdentifier();
+    }
+}