ClangResourceDir returns the clang resource dir if available.

Compare compares two Go version strings.

Get returns a single environment variable, possibly calculating it on-demand.

GetGorootVersion returns the major and minor version for a given GOROOT path.

GorootVersionString returns the version string as reported by the Go toolchain.

Parse parses the Go version (like "go1.3.2") in the parameter and return the major, minor, and patch version: 1, 3, and 2 in this example.

Return TinyGo version, either in the form 0.30.0 or as a development version (like 0.30.0-dev-abcd012).

Keys is a slice of all available environment variable keys.

TINYGOROOT is the path to the final location for checking tinygo files.