GNU Prolog is a free Prolog compiler with constraint solving over finite domains. GNU Prolog accepts Prolog with constraint programs and produces native binaries (like gcc does from a C source). The obtained executable is then stand-alone. The size of this executable can be small since GNU Prolog can avoid linking the code of most unused built-in predicates. The performances of GNU Prolog are very encouraging (comparable to commercial systems). Beside the native-code compilation, GNU Prolog offers a classical interpreter (top-level) with a debugger.
The Prolog part conforms to the ISO standard for Prolog with many extensions very useful in practice (global variables, OS interface, and sockets). GNU Prolog also includes an efficient constraint solver over Finite Domains (FD). This opens constraint logic programming to the user combining the power of constraint programming to the declarativity of logic programming. Features include conforms to the ISO standard for Prolog, line editing facility under the interactive interpreter with completion on atoms, bidirectional interface between Prolog and C, native-code compiler producing stand alone executables, simple command-line compiler accepting a variety of files, predefined constraints: arithmetic constraints, Boolean constraints, symbolic constraints, and reified constraints, predefined enumeration heuristics, and user can define his own new constraints.
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