create manifest file's parent if needed.

Bugzilla Report 66231

WHATSNEW

@@ -59,6 +59,10 @@ Other changes:
    performance in some special cases.
    Bugzilla Report 66048
 
+ * <manifest> will now create the parent directory of the manifestFile
+   attribute if it doesn't exist.
+   Bugzilla Report 66231
+
 Changes from Ant 1.10.11 TO Ant 1.10.12
 =======================================
 

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

@@ -238,6 +238,14 @@ public class ManifestTask extends Task {
                 error = new BuildException("Failed to read " + manifestFile,
                                            e, getLocation());
             }
+        } else {
+            final File parent = manifestFile.getParentFile();
+            if (parent != null && !parent.isDirectory()
+                && !(parent.mkdirs() || parent.isDirectory())) {
+                throw new BuildException(
+                    "Failed to create missing parent directory for %s",
+                    manifestFile);
+            }
         }
 
         // look for and print warnings