if a1.built == a.Target {
		a.built = a.Target
		if !a.buggyInstall {
			b.cleanup(a1)
		}
		// Whether we're smart enough to avoid a complete rebuild
		// depends on exactly what the staleness and rebuild algorithms
		// are, as well as potentially the state of the Go build cache.
		// We don't really want users to be able to infer (or worse start depending on)

// outside of the usual work spaces, but such programs cannot be
// installed with "go install" (there is no work space in which to install them),
// so they are rebuilt from scratch each time they are built.
// To avoid ambiguity, Go programs cannot use relative import paths
// within a work space.
//
// # Remote import paths
//
// Certain import paths also

		// No permanent install target.
		p.Target = ""
	} else if p.Standard && cfg.BuildContext.Compiler == "gccgo" {
		// gccgo has a preinstalled standard library that cmd/go cannot rebuild.
		p.Target = ""
	} else {
		p.Target = p.Internal.Build.PkgObj
		if cfg.BuildBuildmode == "shared" && p.Internal.Build.PkgTargetRoot != "" {