Microsoft KB Archive/77945

= FIX: Alignment in Nested Structures Incorrect in MASM 6 =

Article ID: 77945

Article Last Modified on 10/17/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.0 Standard Edition

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This article was previously published under Q77945



SYMPTOMS
The Microsoft Macro Assembler (MASM) version 6.0 does not pad aligned nested structures correctly. The list file shown below illustrates this problem.



RESOLUTION
Manually padding the structure definition to force the nested structure to have the correct alignment will work around this problem.



STATUS
Microsoft has confirmed this to be a problem in MASM version 6.0. This problem was corrected in MASM version 6.0a.



MORE INFORMATION
The following code can be used to demonstrate the problem.

Sample Code
; Assemble options needed: /c /Fl

.MODEL small, C

.DATA struct1 STRUCT 2         ; Alignment value is 2 field1 WORD ? ; Offset is 0 field2 BYTE ? ; Offset is 2 struct1 ENDS

struct2 STRUCT 2         ; Alignment value is 2 field3 BYTE ? ; Offset is 0 nested struct1 <?, ?>  ; Offset is 1, should struct2 ENDS             ;   be padded to 2

END

Additional query words: 6.00 buglist6.00 fixlist6.00a

Keywords: KB77945

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