f77: VAX / VMS Logical File Names

If you are porting from VMS FORTRAN to FORTRAN 77, the VMS-style logical file names in the INCLUDE statement are mapped to UNIX path names. The environment variable LOGICALNAMEMAPPING defines the mapping between the logical names and the UNIX path name. If the environment variable LOGICALNAMEMAPPING is set and the -vax, -xl or -xld compiler options are used, the compiler interprets VMS logical file names on the INCLUDE statement.

The compiler sets the environment variable to a string with the following syntax:

      "lname1=path1; lname2=path2;  " 

Each lname is a logical name, and each path is the path name of a directory (without a trailing /). All blanks are ignored when parsing this string. Any trailing /list or /nolist is stripped from the file name in the INCLUDE statement. Logical names in a file name are delimited by the first colon in the VMS file name. The compiler converts file names of the form:

      
lname1:file

to:

      
path1/file 

Uppercase and lowercase are significant in logical names. If a logical name is encountered on the INCLUDE statement that was not specified by LOGICALNAMEMAPPING, the file name is used unchanged.