Index: include/llvm/LTO/legacy/ThinLTOCodeGenerator.h
===================================================================
--- include/llvm/LTO/legacy/ThinLTOCodeGenerator.h
+++ include/llvm/LTO/legacy/ThinLTOCodeGenerator.h
@@ -149,10 +149,12 @@
   void setCacheDir(std::string Path) { CacheOptions.Path = std::move(Path); }
 
   /// Cache policy: interval (seconds) between two prune of the cache. Set to a
-  /// negative value (default) to disable pruning. A value of 0 will be ignored.
+  /// negative value to disable pruning. A value of 0 will be ignored.
   void setCachePruningInterval(int Interval) {
-    if (Interval)
-      CacheOptions.Policy.Interval = std::chrono::seconds(Interval);
+      if (Interval)
+          CacheOptions.Policy.Interval = Interval > 0
+          ? std::chrono::seconds(Interval)
+          : std::chrono::seconds::max();
   }
 
   /// Cache policy: expiration (in seconds) for an entry.