var gentab = []struct {
	pkg  string // Relative to $GOROOT/src
	file string
	gen  func(dir, file string)
}{
	{"go/build", "zcgo.go", mkzcgo},
	{"cmd/go/internal/cfg", "zdefaultcc.go", mkzdefaultcc},
	{"runtime/internal/sys", "zversion.go", mkzversion},
	{"time/tzdata", "zzipdata.go", mktzdata},
}

// installed maps from a dir name (as given to install) to a chan

}

// checkGCCBaseCmd returns the start of the compiler command line.
// It uses $CC if set, or else $GCC, or else the compiler recorded
// during the initial build as defaultCC.
// defaultCC is defined in zdefaultcc.go, written by cmd/dist.
//
// The compiler command line is split into arguments on whitespace. Quotes
// are understood, so arguments may contain whitespace.
//