From: jameskuyper@alumni.caltech.edu   
      
   On 2026-01-06 21:08, Paul J. Lucas wrote:   
   ...   
   > What the author meant is that optimization can make UB manifest more   
   > bizarrely in ways than not optimizing wouldn't.  Code that contains UB   
   > is always wrong.   
      
   "undefined behavior" is defined by the C standard as referring to   
   behavior on which "this international standard imposes no requirements".   
   It remains UB even if some other document imposes requirements on the   
   behavior. In particular, if a given implementation implements an   
   extension that gives defined behavior to code that the C standard does   
   not, it's still UB, but it's entirely reasonable for users of that   
   implementation to decide they want to use that extension.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)