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HP C A.06.05 Reference Manual

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What is HP C?
Compatibility Mode
Chapter 1 3
Compatibility Mode
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.