APPNOTE: Patch, Allocate, Mixed-Language Windows Programming

ID: Q78522

The information in this article applies to:

Microsoft FORTRAN for MS-DOS, version 5.1

SUMMARY

This application note corrects the unresolved externals that may occur when linking a mixed-language Windows program using FORTRAN and C. If the FORTRAN code uses the ALLOCATE statement, LINK may generate the following errors:

   LINK : error L2029:  Unresolved external: _hfree
   LINK : error L2029:  Unresolved external: _hmalloc

To obtain the application note "PATCH: Allocate in Mixed-Language Windows Programming," call Microsoft Product Support Services.

MORE INFORMATION

The following file is available for download from the Microsoft Software Library:

 ~ HF0484.exe (size: 18675 bytes)

For more information about downloading files from the Microsoft Software Library, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q119591
   TITLE     : How to Obtain Microsoft Support Files from Online Services

The following is the text of the application note:

    Microsoft Product Support Services Application Note (Text File)
     HF0484: PATCH: ALLOCATE IN MIXED-LANGUAGE WINDOWS PROGRAMMING

                                                  Revision Date: 11/91
                                                         Disk Included

The following information applies to FORTRAN version 5.1.

 --------------------------------------------------------------------
| INFORMATION PROVIDED IN THIS DOCUMENT AND ANY SOFTWARE THAT MAY    |
| ACCOMPANY THIS DOCUMENT (collectively referred to as an            |
| Application Note) IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY      |
| KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO    |
| THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A     |
| PARTICULAR PURPOSE. The user assumes the entire risk as to the     |
| accuracy and the use of this Application Note. This Application    |
| Note may be copied and distributed subject to the following        |
| conditions: 1) All text must be copied without modification and    |
| all pages must be included; 2) If software is included, all files  |
| on the disk(s) must be copied without modification [the MS-DOS(R)  |
| utility DISKCOPY is appropriate for this purpose]; 3) All          |
| components of this Application Note must be distributed together;  |
| and 4) This Application Note may not be distributed for profit.    |
|                                                                    |
| Copyright 1991 Microsoft Corporation. All Rights Reserved.         |
| Microsoft, MS-DOS, and the Microsoft logo are registered           |
| trademarks and Windows is a trademark of Microsoft Corporation.    |
 --------------------------------------------------------------------

This application note corrects a problem that occurs when you link a mixed-language Windows program using FORTRAN and C. If the FORTRAN code uses the ALLOCATE statement, LINK generates two errors:

   LINK : error L2029:  Unresolved external: _hfree
   LINK : error L2029:  Unresolved external: _hmalloc

The errors are caused by the absence of several routines in the C- compatible FORTRAN run-time library. To correct this problem, you must add to the C-compatible FORTRAN run-time library the three object modules that are included on the enclosed HF0484 disk.

Modifying the C-Compatible FORTRAN Run-Time Library

To make the correction to the C-compatible FORTRAN run-time library, copy the following three object modules from the enclosed HF0484 disk to the directory where your FORTRAN library is located:

   WHALLOC.OBJ
   WHSEG.OBJ
   HMAP.OBJ

Then, enter the following command

   LIB <LIBNAME.LIB> + WHALLOC.OBJ + WHSEG.OBJ + HMAP.OBJ;

where <LIBNAME.LIB> represents the name of the C-compatible FORTRAN run-time library you want to modify. You can then delete the three object modules from the library directory. The library manager will make a backup file named <LIBNAME.BAK>. When the new library has been tested successfully, you can also delete this backup file.

Additional query words: Keywords : kbfile kbsample

Last Reviewed: December 10, 1998