Copyright 2015 The Go Authors. All rights reserved. Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
package sys contains system- and configuration- and architecture-specific constants used by the runtime.
package sys
The next line makes 'go generate' write the zgo*.go files with per-OS and per-arch information, including constants named Goos$GOOS and Goarch$GOARCH for every known GOOS and GOARCH. The constant is 1 on the current system, 0 otherwise; multiplying by them is useful for defining GOOS- or GOARCH-specific constants.