Merge pull request #9617 from 9999years/stack-overflow-segfault

Fix segfault on infinite recursion in some cases

(cherry picked from commit bf1b294bd81ca76c5ec9fe3ecd52196bf52a8300)
Change-Id: Id137541426ec8536567835953fccf986a3aebf16

src/libexpr/eval-settings.hh

@@ -111,6 +111,9 @@ struct EvalSettings : Config
 
     Setting<bool> traceVerbose{this, false, "trace-verbose",
         "Whether `builtins.traceVerbose` should trace its first argument when evaluated."};
+
+    Setting<unsigned int> maxCallDepth{this, 10000, "max-call-depth",
+        "The maximum function call depth to allow before erroring."};
 };
 
 extern EvalSettings evalSettings;