test if all extensions support parallel install before attempting parallel extension install

easybuild/framework/easyblock.py

@@ -2039,10 +2039,18 @@ def install_all_extensions(self, install=True):
         self.log.debug("List of loaded modules: %s", self.modules_tool.list())
 
         if build_option('parallel_extensions_install'):
-            try:
+            # check to see if parallel extension install is supported for all extensions
+            # if it is not then we'll fallback to sequential install
+            all_exts_parallel = True
+            for ext in self.ext_instances:
+                if Extension.install_extension_async.__code__.co_code == ext.install_extension_async.__code__.co_code:
+                    self.log.info(f"Extension {ext.name} does not support asynchronous installation")
+                    all_exts_parallel = False
+                    break
+
+            if all_exts_parallel:
                 self.install_extensions_parallel(install=install)
-            except NotImplementedError:
-                # If parallel extension install is not supported for this type of extension then install sequentially
+            else:
                 msg = "Parallel extensions install not supported for %s - using sequential install" % self.name
                 self.log.info(msg)
                 self.install_extensions_sequential(install=install)