Microsoft KB Archive/164953

= Visual C++ Alpha Edition 4.2B C2.EXE 10.20.7032 =

Article ID: 164953

Article Last Modified on 8/5/2004

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APPLIES TO


 * Microsoft Visual C++ 4.2 Enterprise Edition, when used with:
 * the hardware: DEC Alpha
 * Microsoft Visual C++ 4.2 Professional Edition, when used with:
 * the hardware: DEC Alpha

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This article was previously published under Q164953



SUMMARY
The /Oa (Assume No Aliasing) and /Ow (Assume Aliasing Across Function Calls) options do not work correctly in the compiler shipped with Visual C++ version 4.2b for Alpha. The same options can be selected via the #pragma optimize statement.

If your code is compiled with the /Oa or /Ow command-line options, or if the code you compile turns on the "a" or "w" options in a #pragma optimize statement, your code could experience aliasing problems. These problems most frequently manifest as corrupted data.

Version 10.20.7032 of c2.exe disables these options regardless of whether they are set on the command line or using pragmas in the code.

The following files are available for download from the Microsoft Download Center:

Ac242bpa.exe

For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:

119591 How to Obtain Microsoft Support Files from Online Services

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