PRB: L2029 "Unresolved External" Errors Linking FORTRAN App

ID: Q31577

1.00 1.00a 4.00 4.01 4.10 5.00 5.10 | 4.10 5.00 5.10

MS-DOS                              | OS/2

The information in this article applies to:

• Microsoft FORTRAN for MS-DOS, versions 4.0, 4.01, 4.1, 5.0, 5.1
• Microsoft FORTRAN for OS/2, versions 4.1, 5.0, 5.1
• Microsoft FORTRAN PowerStation for MS-DOS, versions 1.0 and 1.0a

SYMPTOMS

During the process of linking an application, the linker generates a number of error messages of the following form:

   error L2029: '_name' unresolved external

CAUSE

There are three main causes for this error:

• The FORTRAN libraries were built with C compatibility support and the C libraries are not linked with the application. The C- compatible FORTRAN libraries do not contain the routines common to both C and FORTRAN.

  -or-

• The version of the linker is not correct.

  -or-

• A terminate-and-stay-resident (TSR) program interferes with the linking process.

RESOLUTION

The corresponding resolutions are as follows:

• Link the application with both the C libraries and FORTRAN libraries.
• Ensure that the latest version of the linker is installed.
• Modify the AUTOEXEC.BAT file to remove all unnecessary TSR programs.

Last Reviewed: April 30, 1998