In GT.M, the name of the source file determines the name of the GT.M routine. The file-specification name of the object file is not required to match the name of the routine. Linking the object file makes the internal routine name (derived from the source file) known to GT.M. This can lead to potential confusion, however, since both ZLINK and auto-ZLINK use the name of the object file to find the routine. When the object file name differs from the name of the routine, auto-ZLINK generates a run-time error.