Microsoft KB Archive/72849

= FIX: L1126 Link Error May Be Caused By EXPORT in PROC Definition =

Article ID: 72849

Article Last Modified on 10/22/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.0 Standard Edition
 * Microsoft Macro Assembler 6.0a
 * Microsoft Macro Assembler 6.0b

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This article was previously published under Q72849



SYMPTOMS
When creating an exported function with the Microsoft Macro Assembler (MASM) version 6.0, 6.0a, or 6.0b, the EXPORT keyword can be used in a procedure definition and MASM will automatically generate the correct .OBJ record to add it to the export table for the .EXE (or DLL). This is useful when creating a procedure in a DLL that is called from outside the DLL, when creating a callback procedure in an .EXE, or when defining a procedure as residing in an IOPL segment with OS/2.

However, there is a problem when the EXPORT keyword is used in the latter case. When creating an IOPL function, you must declare the number of words that will be required to hold the parameters for the function. The operating system then uses this value to build the stack that the IOPL function will run on. You normally do this by adding the word count after the function name in the EXPORT section of the associated .DEF file. For example, the .DEF file may contain the following: EXPORTS _Func 3



CAUSE
The problem results when you then use the EXPORT keyword in MASM for the procedure definition for the IOPL function as follows: Func PROC EXPORT, arg1:WORD, arg2:WORD, arg3:WORD MASM will generate an EXPDEF (EXPort DEFinition) record that lists the parameter word count as zero. If you then link with the .DEF file that correctly lists the word count as three, the linker will return the following error message:

fatal error L1126: conflicting pwords value



RESOLUTION
The workaround is to change the EXPORT keyword in the procedure definition to PUBLIC.



STATUS
Microsoft has confirmed this to be a problem in MASM versions 6.0, 6.0a, and 6.0b. This problem was corrected in MASM for MS-DOS version 6.1.

TEST.ASM
;; Assemble options needed: none

.MODEL large .286

.CODE Func PROC C EXPORT, arg1:PTR DWORD, arg2:WORD Func ENDP END Func

TEST.DEF
; Module definition file for linking

NAME Test

EXPORTS _Func 3

Additional query words: 6.00 6.00a 6.00b buglist6.00 buglist6.00a buglist6.00b fixlist6.10

Keywords: kbfix KB72849

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