How Can I Speed Up go build and Avoid Unnecessary Rebuilds?

Resolving Unnecessary Rebuilds with go build

Original Question:

Go's go build command can be slow for small programs, especially those involving Cgo invocations. Is there a way to cache the binary and avoid unnecessary rebuilds?

Answer:

Yes, as of Go 1.10 (released in Q1 2018), go build and go install have significant performance improvements thanks to the implementation of a build cache.

Cache Functionality:

The go command now maintains a cache of built packages and small metadata in the operating system's defined user cache directory by default (configurable with $GOCACHE). The cache is used for incremental builds, reducing rebuild time.

Example Usage:

To use the build cache, simply run:

go build <package name>

Or:

go install <package name>

Additional Notes:

• The cache is deleted with go clean -cache instead of manually deleting the cache directory.
• go install does not install dependencies of the named packages (see "What does go build build?").

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