12.07.2015 Views

PGI Fortran - Servidor WWW del Cluster Ladon-Hidra

PGI Fortran - Servidor WWW del Cluster Ladon-Hidra

PGI Fortran - Servidor WWW del Cluster Ladon-Hidra

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7 3F Functions and VAXSubroutinesThe <strong>PGI</strong> Fortran compilers support FORTRAN 77 3F functions and VAX/VMS systemsubroutines and built-in functions.7.1 3F RoutinesThis section describes the functions and subroutines in the Fortran run-time library which areknown as 3F routines on many systems. These routines provide an interface from Fortranprograms to the system in the same manner as the C library does for C programs. These functionsand subroutines are automatically loaded from <strong>PGI</strong> 's Fortran run-time library if referenced by aFortran program.The implementation of many of the routines uses functions which reside in the C library. If a Clibrary does not contain the necessary functions, undefined symbol errors will occur at link-time.For example, if <strong>PGI</strong>’s C library is the C library available on the system, the following 3F routinesexist in the Fortran run-time library but use of these routines will result in errors at link-time:besj0besj1besjnbesy0besy1besyndbesj0dbesj1dbesjndbesy0dbesy1dbesynderfderfcerferfc3F Functions and VAX Subroutines 253

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