Almost all successful portability efforts have been based … certain constraints. There are two basic approaches, the … the individual ports are subsets of the ideal, … implementations include some endornments. The GCD approach is … be very satisfactory. More imagination and discipline are … over a wide variety of targets since the … [e.g., it is easy to implement Pascal PCODE but hard to make it run efficiently] ;;380 "The most successful single approach [to portability] is to … The limits of portability are then defined by … The success of the effort depends crucially on …
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