Microsoft KB Archive/117796

= PRB: Incorrect Debug Information in 32-bit Object Module =

Article ID: 117796

Article Last Modified on 10/14/2003

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APPLIES TO


 * Microsoft Macro Assembler 6.1 Standard Edition

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This article was previously published under Q117796



SYMPTOMS
When you step through assembly source code with a debugger, instructions do not seem to execute properly. Switching to mixed assembly and source shows the source code does not match up with the disassembled code.



CAUSE
When you debug a Windows NT application containing an Object Module Format (OMF) object module created with Microsoft Macro Assembler (MASM), version 6.1, the source line number debug information is incorrect when converted to Common Object File Format (COFF) by a 32-bit linker (such as the linker shipped with Microsoft Visual C++, 32-bit edition). This results in lines in the source file being incorrectly associated with points in the executable file.



RESOLUTION
Assemble the assembly source file using the /coff switch, which will cause MASM to generate a COFF object module.



MORE INFORMATION
COFF is the preferred object file format for Windows NT, and you should always use the /coff switch when assembling source files for use in the Windows NT operating system.

Additional query words: 6.10a 6.11 6.11a

Keywords: kbprb KB117796

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