XPost: alt.folklore.computers   
   From: Peter@Iron-Spring.com   
      
   On 1/2/26 14:33, Lawrence D’Oliveiro wrote:   
   > 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”.   
      
   It defeats the purpose of a structure if the compiler is free to   
   rearrange it. Local variables (PL/I AUTOMATIC) can, in most languages,   
   be stored however the compiler wants.   
      
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