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 Compile-time 

In computer science, compile-time, as opposed to run-time, is the compiling phase in which code written in one programming language is translated into another language.

Because some information are only available for compiler and some other are only can be extracted in runtime, certain tasks can be done in compile-time and some in runtime. Typically in compile-time the following tasks can be done: Type-checking[?], Static binding[?], enforcing scoping rules, instantiating of templates[?], optimization. Those are also called semantic analysis. Typically the following tasks might not be done: boundary check of an array, dynamic binding[?].

Compile-time errors are those detected already during compilation, i.e. before even starting execution.

In compile-time, some tasks that cannot be done in a run-time environment can be done. See cross-compiler[?].

When an interpreter is used there may be no separation between compile-time and run-time. There may instead be a interpretation phase (often into bytecode) followed by execution, but performed by the same software and not exposed to the user. A type of error that would otherwise be a compile-time error, will then be detected in the course of executing the program.


See also: compiler, run-time, binding

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