Write once, compile anywhere
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Write once, compile anywhere (WOCA) refers to writing software that compiles and is thus useable on all platforms. As opposed to Sun's Write once, run anywhere slogan, cross-platform compatibility is implemented at the source code level, rather than at the compiled binary code level. There are many languages that follow the WOCA philosophy. WOCA is the philosophy that cross-platform applications in languages like Ada or C take. Cross-platform libraries, for things like sockets and GUIs, are used to cope with portability issues.
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