XPost: comp.lang.c   
   From: derek@knosof.co.uk   
      
   glen,   
      
   > Someone in comp.lang.c is interested in understanding how a 40 years   
   > old C compilers works, but doesn't know much about compilers.   
      
   This begs the question of what is the oldest compiler still in   
   production use.   
      
   Here is a non-C candidate:   
   http://shape-of-code.coding-guidelines.com/2012/08/31/the-oldest   
   compiler-still-in-production-use-is/   
      
   > Seems to me that one way to learn is to read 40 year old compiler books.   
      
   They don't always reflect reality on the ground.   
      
   Here is a 30 year old C compiler:   
   http://www.desmet-c.com/   
      
   and of course the grandaddy of them all:   
   http://www.cs.bell-labs.com/who/dmr/primevalC.html   
      
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