Can Compilers Remove Unused Functions?

Optimizing Unused Functions

In the world of compilers, optimization plays a crucial role in enhancing code efficiency. One common question that arises is whether compilers can detect and remove unused functions from the final output.

Answer

The answer to this question lies in the specific compiler and its optimization capabilities. For instance, Visual C 9, a highly optimized compiler, boasts the ability to remove unused functions during the compilation phase. Specifically, it eliminates unused static functions, alerting the developer with a C4505 warning.

Moreover, functions with external linkage may also be removed at the linking phase. This removal is contingent on the linker settings employed. By selecting appropriate linker options, you can instruct the linker to discard unused functions with external linkage, further optimizing the final output code.

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