From: "David Brown"    
   Sent: Saturday, May 04, 2019 1:23 AM   
      
   > You are, as usual, very keen to pick out gcc as though it was something   
   > special here.  Compilers have been assuming signed integer overflow   
   > never happens for over 20 years (that's just from my own personal   
   > experience), long before gcc was that smart.   
      
   Some compilers might, but I have not met one that does ignore   
   overflow.   
      
   Even in evaluating compile-time expressions, an overflow   
   is treated as an error, and a diagnostic is issued.   
   [clang and gcc definitely generate code that ignores integer overflows   
   at runtime. I just checked. -John]   
      
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