| title |
Backward Compatibility | Microsoft Docs |
| ms.custom |
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| ms.date |
11/04/2016 |
| ms.reviewer |
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| ms.suite |
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| ms.technology |
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| ms.tgt_pltfrm |
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| ms.topic |
article |
| f1_keywords |
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| dev_langs |
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| helpviewer_keywords |
CRT, compatibility |
backward compatibility, C run-time libraries |
compatibility, C run-time libraries |
backward compatibility |
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| ms.assetid |
cc3175cf-97fd-492f-b329-5791aea63090 |
| caps.latest.revision |
7 |
| author |
corob-msft |
| ms.author |
corob |
| manager |
ghogen |
For compatibility between product versions, the library OLDNAMES.LIB maps old names to new names. For instance, open maps to _open. You must explicitly link with OLDNAMES.LIB only when you compile with the following combinations of command-line options:
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/Zl (omit default library name from object file) and /Ze (the default — use Microsoft extensions)
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/link (linker-control), /NOD (no default-library search), and /Ze
For more information about compiler command-line options, see Compiler Reference.
Compatibility