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) {

		ev := &ret[i]
		switch ev.Name {
		case "GOGCCFLAGS": // GOGCCFLAGS cannot be modified
		case "CGO_CPPFLAGS":
			ev.Changed = ev.Value != ""
		case "PKG_CONFIG":
			ev.Changed = ev.Value != cfg.DefaultPkgConfig
		case "CGO_CXXFLAGS", "CGO_CFLAGS", "CGO_FFLAGS", "GGO_LDFLAGS":
			ev.Changed = ev.Value != work.DefaultCFlags
		}
	}

	return ret
}

	tooldir          string
	oldgoos          string
	oldgoarch        string
	oldgocache       string
	exe              string
	defaultcc        map[string]string
	defaultcxx       map[string]string
	defaultpkgconfig string
	defaultldso      string

	rebuildall bool
	noOpt      bool
	isRelease  bool

	vflag int // verbosity
)

// The known architectures.
var okgoarch = []string{
	"386",
	"amd64",

	return b.Shell(a).writeFile(file, icfg.Bytes())
}

// PkgconfigCmd returns a pkg-config binary name
// defaultPkgConfig is defined in zdefaultcc.go, written by cmd/dist.
func (b *Builder) PkgconfigCmd() string {
	return envList("PKG_CONFIG", cfg.DefaultPkgConfig)[0]
}

// splitPkgConfigOutput parses the pkg-config output into a slice of flags.