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  2. RPG400-L
  3. August 2003

Re: /Free -- A question

> But the compiler is different each time new features are added.

The run time is different, too.  That is to say, V5R2 may well have new OS
APIs to handle things that V4R5 does not have.  If the V5R2 binary running
on V4R5 tries to call this OS API and can't find it... boom!  It has been my
understanding that the backward compatibility has always been intended so
that the source will compile and run on a machine which is at the TGTRLS()
parameter.

So, if you say TGTRLS(V4R5M0), the source will actually compile on an
original V4R5 machine.
  --buck

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