New preference: enable all compiler warnings, off by default. Fixes #1728 and #2415. Also affects #2634 and #2207

app/src/processing/app/Preferences.java

@@ -203,10 +203,9 @@ public class Preferences {
   JCheckBox verboseCompilationBox;
   JCheckBox verboseUploadBox;
   JCheckBox displayLineNumbersBox;
+  JCheckBox enableCompilerWarningsBox;
   JCheckBox verifyUploadBox;
   JCheckBox externalEditorBox;
-  JCheckBox memoryOverrideBox;
-  JTextField memoryField;
   JCheckBox checkUpdatesBox;
   JTextField fontSizeField;
   JCheckBox updateExtensionBox;
@@ -352,6 +351,15 @@ public class Preferences {
     pane.add(box);
     d = box.getPreferredSize();
     box.setBounds(left, top, d.width, d.height);
+    top += d.height + GUI_BETWEEN;
+
+	// [ ] Enable all compiler warnings
+
+    enableCompilerWarningsBox = new JCheckBox(_("Enable all compiler warnings"));
+    pane.add(enableCompilerWarningsBox);
+    d = enableCompilerWarningsBox.getPreferredSize();
+    enableCompilerWarningsBox.setBounds(left, top, d.width + 10, d.height);
+    right = Math.max(right, left + d.width);
     top += d.height + GUI_BETWEEN;
 
 	// [ ] Display line numbers
@@ -674,6 +682,7 @@ public class Preferences {
     PreferencesData.setBoolean("editor.linenumbers", displayLineNumbersBox.isSelected());
     PreferencesData.setBoolean("upload.verify", verifyUploadBox.isSelected());
     PreferencesData.setBoolean("editor.save_on_verify", saveVerifyUploadBox.isSelected());
+    PreferencesData.setBoolean("build.allwarnings", enableCompilerWarningsBox.isSelected());
 
 //    setBoolean("sketchbook.closing_last_window_quits",
 //               closingLastQuitsBox.isSelected());
@@ -758,6 +767,7 @@ public class Preferences {
     verboseUploadBox.setSelected(PreferencesData.getBoolean("upload.verbose"));
     displayLineNumbersBox.setSelected(PreferencesData.getBoolean("editor.linenumbers"));
     verifyUploadBox.setSelected(PreferencesData.getBoolean("upload.verify"));
+    enableCompilerWarningsBox.setSelected(PreferencesData.getBoolean("build.allwarnings"));
 
     //closingLastQuitsBox.
     //  setSelected(getBoolean("sketchbook.closing_last_window_quits"));

arduino-core/src/processing/app/debug/Compiler.java

@@ -559,6 +559,7 @@ public class Compiler implements MessageConsumer {
       File objectFile = new File(outputPath, file.getName() + ".o");
       objectPaths.add(objectFile);
       String[] cmd = getCommandCompilerByRecipe(includeFolders, file, objectFile, "recipe.S.o.pattern");
+      cmd = enableWarnings(cmd, prefs.getBoolean("build.allwarnings"));
       execAsynchronously(cmd);
     }
  		
@@ -569,6 +570,7 @@ public class Compiler implements MessageConsumer {
       if (isAlreadyCompiled(file, objectFile, dependFile, prefs))
         continue;
       String[] cmd = getCommandCompilerByRecipe(includeFolders, file, objectFile, "recipe.c.o.pattern");
+      cmd = enableWarnings(cmd, prefs.getBoolean("build.allwarnings"));
       execAsynchronously(cmd);
     }
 
@@ -579,12 +581,24 @@ public class Compiler implements MessageConsumer {
       if (isAlreadyCompiled(file, objectFile, dependFile, prefs))
         continue;
       String[] cmd = getCommandCompilerByRecipe(includeFolders, file, objectFile, "recipe.cpp.o.pattern");
+      cmd = enableWarnings(cmd, prefs.getBoolean("build.allwarnings"));
       execAsynchronously(cmd);
     }
     
     return objectPaths;
   }
 
+  private String[] enableWarnings(String[] cmd, boolean enable) {
+    if (!enable) {
+      return cmd;
+    }
+
+    List<String> cmdList = new ArrayList<String>(Arrays.asList(cmd));
+    cmdList.remove("-w");
+
+    return cmdList.toArray(new String[cmdList.size()]);
+  }
+
   /**
    * Strip escape sequences used in makefile dependency files (.d)
    * https://github.com/arduino/Arduino/issues/2255#issuecomment-57645845

arduino-core/src/processing/app/helpers/PreferencesMap.java

@@ -311,7 +311,7 @@ public class PreferencesMap extends LinkedHashMap<String, String> {
    *         insensitive compared), <b>false</b> in any other case
    */
   public boolean getBoolean(String key) {
-    return new Boolean(get(key));
+    return Boolean.valueOf(get(key));
   }
 
   /**