How Can I Optimize Go Compilation Speed and Size?

Optimizing Go Compilation: Exploring Flags for Speed and Size Enhancements

Compiling a Go program typically involves executing the "go build myprogram.go" command. This process compiles the code into an executable, but does it allow for the inclusion of optimization flags?

Optimization Flags in Official Go Compiler

Contrary to the approach taken with gccgo, where "-O2" and "-O0" flags are utilized, the official Go compiler does not offer explicit optimization flags.

Go Compiler Optimizations

Despite the absence of user-controlled flags, the Go compiler automatically applies various optimizations. These optimizations are documented on the Go wiki and include:

• Dead code elimination
• Constant folding
• Common subexpression elimination

Disabling Optimizations for Debugging

While the compiler handles optimizations internally, it is possible to disable them for debugging purposes using the "gcflags" command-line flag. This flag enables specific compiler settings, including:

• -N: Disables all optimizations
• -l: Disables inlining

Usage Example

To disable both optimizations in the Go gc compiler, use the following command:

go build -gcflags '-N -l' myprogram.go

Conclusion

While the Go compiler does not expose user-controllable optimization flags, it applies various optimizations internally. However, it offers the option to disable optimizations using the "gcflags" flag, allowing developers to debug code without compiler-imposed enhancements.

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