Microsoft KB Archive/27986

= PRB: F1901 Error - Long Variable List in EQUIVALENCE Statement =

Article ID: 27986

Article Last Modified on 12/1/2003

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APPLIES TO


 * Microsoft FORTRAN Compiler 4.01
 * Microsoft FORTRAN Compiler 4.1
 * Microsoft FORTRAN Compiler 5.0
 * Microsoft FORTRAN Compiler 5.1
 * Microsoft FORTRAN Compiler 4.1
 * Microsoft FORTRAN Compiler 5.0
 * Microsoft FORTRAN Compiler 5.1

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This article was previously published under Q27986



SYMPTOMS
An attempt to compile an application fails and the compiler generates the following message:

F1901: program too large for memory



CAUSE
The application uses an EQUIVALENCE statement that contains a very large list of variables. The FORTRAN compile stores data in the near heap. If the data exhausts the available space, the F1901 error occurs.



RESOLUTION
To avoid this problem, use the high-capacity FORTRAN compiler to free memory in the near heap. The high-capacity FORTRAN compiler is provided with FORTRAN version 5.0 and later.

FORTRAN PowerStation can handle the example code in this article.



STATUS
This behavior is by design in FORTRAN. It is a restriction in the FORTRAN compiler as documented in Appendix C of the FORTRAN &quot;Reference&quot; manual for version 5.1 (page 409).



MORE INFORMATION
To use the high-capacity compiler, copy the F1L.EXE file from the FORTRAN 5.0 High-Capacity Compiler Disk into the FORTRAN BIN directory (by default, C:\FORTRAN\BIN). Modify the compiler command line to specify the /B1 compiler option switch and the path to the high-capacity compiler. For example, to compile the TEST.FOR source file with the high-capacity compiler located in the default directory, use the following command line:   FL /B1 C:\FORTRAN\BIN\F1L.EXE TEST.FOR The following code example demonstrates this problem.

Sample Code
C Compile options needed: None

IMPLICIT REAL*8 (A-Z) EQUIVALENCE +(A1, B1),  (C1, D1),   (E1, F1), +(A2, B2),  (C2, D2),   (E2, F2), +(A3, B3),  (C3, D3),   (E3, F3), +(A4, B4),  (C4, D4),   (E4, F4), +(A5, B5),  (C5, D5),   (E5, F5), +(A6, B6),  (C6, D6),   (E6, F6), +(A7, B7),  (C7, D7),   (E7, F7), +(A8, B8),  (C8, D8),   (E8, F8), +(A9, B9),  (C9, D9),   (E9, F9), +(A10, B10), (C10, D10), (E10, F10), +(A11, B11), (C11, D11), (E11, F11), +(A12, B12), (C12, D12), (E12, F12), +(A13, B13), (C13, D13), (E13, F13), +(A14, B14), (C14, D14), (E14, F14), +(A15, B15), (C15, D15), (E15, F15), +(A16, B16), (C16, D16), (E16, F16), +(A17, B17), (C17, D17), (E17, F17), +(A18, B18), (C18, D18), (E18, F18), +(A19, B19), (C19, D19), (E19, F19), +(A20, B20), (C20, D20), (E20, F20), +(A21, B21), (C21, D21), (E21, F21), +(A22, B22), (C22, D22), (E22, F22), +(A23, B23), (C23, D23), (E23, F23), +(A24, B24), (C24, D24), (E24, F24), +(A25, B25), (C25, D25), (E25, F25), +(A26, B26), (C26, D26), (E26, F26), +(A27, B27), (C27, D27), (E27, F27), +(A28, B28), (C28, D28), (E28, F28), +(A29, B29), (C29, D29), (E29, F29), +(A30, B30), (C30, D30), (E30, F30), +(A31, B31), (C31, D31), (E31, F31), +(A32, B32), (C32, D32), (E32, F32), +(A33, B33), (C33, D33), (E33, F33), +(A34, B34), (C34, D34), (E34, F34), +(A35, B35), (C35, D35), (E35, F35), +(A36, B36), (C36, D36), (E36, F36), +(A37, B37), (C37, D37), (E37, F37), +(A38, B38), (C38, D38), (E38, F38), +(A39, B39), (C39, D39), (E39, F39), +(A40, B40), (C40, D40), (E40, F40), +(A41, B41), (C41, D41), (E41, F41), +(A42, B42), (C42, D42), (E42, F42), +(A43, B43), (C43, D43), (E43, F43), +(A44, B44), (C44, D44), (E44, F44), +(A45, B45), (C45, D45), (E45, F45), +(A46, B46), (C46, D46), (E46, F46), +(A47, B47), (C47, D47), (E47, F47), +(A48, B48), (C48, D48), (E48, F48), +(A49, B49), (C49, D49), (E49, F49), +(A50, B50), (C50, D50), (E50, F50), +(A51, B51), (C51, D51), (E51, F51), +(A52, B52), (C52, D52), (E52, F52), +(A53, B53), (C53, D53), (E53, F53), +(A43, B43), (C43, D43), (E43, F43), +(A44, B44), (C44, D44), (E44, F44), +(A45, B45), (C45, D45), (E45, F45), +(A46, B46), (C46, D46), (E46, F46), +(A47, B47), (C47, D47), (E47, F47), +(A48, B48), (C48, D48), (E48, F48), +(A49, B49), (C49, D49), (E49, F49), +(A50, B50), (C50, D50), (E50, F50), +(A51, B51), (C51, D51), (E51, F51), +(A52, B52), (C52, D52), (E52, F52), +(A53, B53), (C53, D53), (E53, F53), +(A54, B54), (C54, D54), (E54, F54), +(A55, B55), (C55, D55), (E55, F55), +(A56, B56), (C56, D56), (E56, F56), +(A57, B57), (C57, D57), (E57, F57), +(A58, B58), (C58, D58), (E58, F58), +(A59, B59), (C59, D59), (E59, F59), +(A60, B60), (C60, D60), (E60, F60), +(A61, B61), (C61, D61), (E61, F61), +(A62, B62), (C62, D62), (E62, F62), +(A63, B63), (C63, D63), (E63, F63), +(A64, B64), (C64, D64), (E64, F64) END

Additional query words: 4.01 4.10 5.00 5.10

Keywords: KB27986

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