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Compatibility Mode

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You may not want to change your existing code, or you may have old code that relies on certain non-ANSI features. Therefore, a compatibility mode of compilation has been provided. In this mode, virtually all programs that compiled and executed under previous releases of HP C/HP-UX will continue to work as expected.

In HP-UX 10.20 and earlier releases, compatibility mode is the default compilation mode. In HP-UX 10.30 forward, extended ANSI mode (-Ae) is the default.

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