FIX: Warning A4057 When Using Local Variables

Last reviewed: September 11, 1997
Article ID: Q68873

5.10 | 5.10 MS-DOS | OS/2 kbtool kbfixlist kbbuglist

The information in this article applies to:

Microsoft Macro Assembler for MS-DOS, version 5.1
Microsoft Macro Assembler for OS/2, version 5.1

SYMPTOMS

If the code below assembled with Microsoft Macro Assembler (MASM) version 5.1, it produces the following error:

   Warning A4057: illegal size for operand

This warning is falsely generated and does not occur with MASM version 5.1a.

The variable arg1, shown in the code below, is a local variable that is defined as a double word. The warning occurs when arg1 is used as a WORD PTR. This is acceptable and should not be flagged.

STATUS

Microsoft has confirmed this to be a problem in MASM version 5.1. This problem was corrected in version 5.1a.

MORE INFORMATION

Sample Code

; Assemble options needed: none

.MODEL small,c

.CODE

Begin PROC arg1:DWORD

    mov ax, WORD PTR arg1
    ret

Begin ENDP

END

Additional reference words: 5.10 buglist5.10 fixlist5.10a
KBCategory: kbtool kbfixlist kbbuglist
KBSubCategory: MLIss
Solution Type : kbfix

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Last reviewed: September 11, 1997
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