Rational Developer for System z
Enterprise PL/I for z/OS, Version 3.8, Migration Guide

TUNE

The default since Enterprise PL/I V3R2 is TUNE(2). You should not use a lower value for the TUNE option since Enterprise PL/I requires Language Environment 1.3 (and later) and Language Environment 1.3 requires machines that support ARCH(2).

Note that unlike the ARCH option, specifying too high a value for the TUNE option will not cause your program to abend: the TUNE option merely directs the compiler to generate code that favors certain machine levels, but it does not cause the compiler to generate code that requires any particular machine levels.

If you specify a value of 0 or 1, the compiler will reset the value to 2.


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