Do Compilers Optimize Out Unused Functions?

Compiler Optimization and Function Removal

Compilers perform numerous optimizations to enhance code efficiency. One optimization worth considering is the removal of unused functions. This article explores whether compilers can optimize away unused functions from the final output.

Do Unused Functions Get Optimized Out?

The answer is compiler-specific. Visual C 9, for instance, possesses the capability to optimize out unused functions. During compilation, unused static functions are removed. Static functions with internal linkage have their code removed at compile-time.

Unused functions with external linkage may also be removed at the linking stage. However, this behavior is dependent on the linker settings employed. Users configuring the linker appropriately can enable the removal of these functions as well.

By optimizing out unused functions, compilers contribute to reducing code size and improving execution speed. This optimization assists in achieving a more efficient and streamlined executable output.

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