XPost: alt.folklore.computers   
   From: ldo@nz.invalid   
      
   On Fri, 2 Jan 2026 08:49:25 -0800, John Ames wrote:   
      
   > ... it's not guaranteed that the compiler won't take liberties in   
   > arranging members of a struct for optimization purposes ...   
      
   The C23 spec (section 6.2.5, “Types”) does say the member objects of a   
   struct type need to be “sequentially allocated”. The only freedom the   
   compiler has (section 6.2.6) is to add “padding bytes”.   
      
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