Merge remote-tracking branch 'ide-1.5.x-core.a-rebuild' into ide-1.5.x

app/src/processing/app/debug/Compiler.java

@@ -718,13 +718,48 @@ public class Compiler implements MessageConsumer {
     if (variantFolder != null)
       includeFolders.add(variantFolder);
 
+
+    if (variantFolder != null)
+      objectFiles.addAll(compileFiles(buildFolder, variantFolder, true,
+                                      includeFolders));
+
+    File afile = new File(buildFolder, "core.a");
+
     List<File> coreObjectFiles = compileFiles(buildFolder, coreFolder, true,
                                               includeFolders);
+
+    // See if the .a file is already uptodate
+    if (afile.exists()) {
+      boolean changed = false;
+      for (File file : coreObjectFiles) {
+        if (file.lastModified() > afile.lastModified()) {
+          changed = true;
+          break;
+        }
+      }
+
+      // If none of the object files is newer than the .a file, don't
+      // bother rebuilding the .a file. There is a small corner case
+      // here: If a source file was removed, but no other source file
+      // was modified, this will not rebuild core.a even when it
+      // should. It's hard to fix and not a realistic case, so it
+      // shouldn't be a problem.
+      if (!changed) {
+        if (verbose)
+          System.out.println(I18n.format(_("Using previously compiled file: {0}"), afile.getPath()));
+        return;
+      }
+    }
+
+    // Delete the .a file, to prevent any previous code from lingering
+    afile.delete();
+
+    try {
       for (File file : coreObjectFiles) {
 
         PreferencesMap dict = new PreferencesMap(prefs);
         dict.put("ide_version", "" + Base.REVISION);
-      dict.put("archive_file", "core.a");
+        dict.put("archive_file", afile.getName());
         dict.put("object_file", file.getAbsolutePath());
 
         String[] cmdArray;
@@ -736,10 +771,10 @@ public class Compiler implements MessageConsumer {
         }
         execAsynchronously(cmdArray);
       }
-
+    } catch (RunnerException e) {
-    if (variantFolder != null)
+      afile.delete();
-      objectFiles.addAll(compileFiles(buildFolder, variantFolder, true,
+      throw e;
-                                      includeFolders));
+    }
   }
 			
   // 4. link it all together into the .elf file

build/shared/revisions.txt

@@ -2,6 +2,8 @@
 ARDUINO 1.5.9
 
 [ide]
+* Sketch build process: fixed full rebuild on windows even if not needed
+* Sketch build process: core.a rebuild only if needed (Matthijs Kooijman)
 * Updated AStyle formatter to v2.04: http://astyle.sourceforge.net/notes.html
 
 [core]