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The "fr" option is used to name the error file drive, path, file name and
extension.  If the error file name is not specified, it is constructed from
the source file name.  If the output file extension is not specified, it is
".err" by default.  If no part of the name is specified, then no error file
is produced (i.e., /fr disables production of an error file).
Example:

     C>compiler_name report /fr=d:\proj\errs\

A trailing "\" must be specified for directory names.  If, for example, the
option was specified as fr=d:\proj\errs then the output file would be called
D:\PROJ\ERRS.ERR.  A default filename extension must be preceded by a period
(".").

Example:

     C>compiler_name report /fr=d:\proj\errs\.erf