func writeHeader(w io.Writer) {
	fmt.Fprint(w, generatedHeader)
}

// mkzdefaultcc writes zdefaultcc.go:
//
//	package main
//	const defaultCC = <defaultcc>
//	const defaultCXX = <defaultcxx>
//	const defaultPkgConfig = <defaultpkgconfig>
//
// It is invoked to write cmd/go/internal/cfg/zdefaultcc.go
// but we also write cmd/cgo/zdefaultcc.go
func mkzdefaultcc(dir, file string) {

				}

				xmkdirall(dst)
				if path == "cmd/cgo" {
					// Write to src because we need the file both for bootstrap
					// and for later in the main build.
					mkzdefaultcc("", pathf("%s/zdefaultcc.go", src))
					mkzdefaultcc("", pathf("%s/zdefaultcc.go", dst))
				}
				return nil
			}

			for _, pre := range ignorePrefixes {
				if strings.HasPrefix(name, pre) {
					return nil
				}
			}

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

/bin/
/build.out
/doc/articles/wiki/*.bin
/goinstall.log
/last-change
/misc/cgo/life/run.out
/misc/cgo/stdio/run.out
/misc/cgo/testso/main
/pkg/
/src/*.*/
/src/cmd/cgo/zdefaultcc.go
/src/cmd/dist/dist
/src/cmd/go/internal/cfg/zdefaultcc.go
/src/cmd/internal/objabi/zbootstrap.go
/src/go/build/zcgo.go
/src/go/doc/headscan
/src/internal/buildcfg/zbootstrap.go
/src/runtime/internal/sys/zversion.go
/src/unicode/maketables

		"bin/**",
		"pkg/**",

		// Generated during cmd/dist. See ../dist/build.go:/gentab.
		"src/cmd/go/internal/cfg/zdefaultcc.go",
		"src/go/build/zcgo.go",
		"src/runtime/internal/sys/zversion.go",
		"src/time/tzdata/zzipdata.go",

		// Generated during cmd/dist by bootstrapBuildTools.
		"src/cmd/cgo/zdefaultcc.go",
		"src/cmd/internal/objabi/zbootstrap.go",
		"src/internal/buildcfg/zbootstrap.go",

	return err
}

// GccCmd returns a gcc command line prefix
// defaultCC is defined in zdefaultcc.go, written by cmd/dist.
func (b *Builder) GccCmd(incdir, workdir string) []string {
	return b.compilerCmd(b.ccExe(), incdir, workdir)
}

// GxxCmd returns a g++ command line prefix
// defaultCXX is defined in zdefaultcc.go, written by cmd/dist.
func (b *Builder) GxxCmd(incdir, workdir string) []string {

}

// 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.
//