cmake: Fix optimization level for debug builds. (#6097)

Further cleans up some unused variables and moves the configuration of
best to configure.sh.

1 files changed, 5 insertions, 2 deletions

diff --git a/test/unit/expr/node_black.cpp b/test/unit/expr/node_black.cpp
index 61150799c..0d481ea4f 100644
--- a/test/unit/expr/node_black.cpp
+++ b/test/unit/expr/node_black.cpp
@@ -107,9 +107,12 @@ TEST_F(TestNodeBlackNode, copy_ctor) { Node e(Node::null()); }
 TEST_F(TestNodeBlackNode, dtor)
 {
   /* No access to internals? Only test that this is crash free. */
-  Node* n;
+  Node* n = nullptr;
   ASSERT_NO_FATAL_FAILURE(n = new Node());
-  delete n;
+  if (n)
+  {
+    delete n;
+  }
 }
 
 /* operator== */