src/cmd/cgo/internal/swig/swig_test.go | 9 ++++++++-

diff --git a/src/cmd/cgo/internal/swig/swig_test.go b/src/cmd/cgo/internal/swig/swig_test.go
index 41563138a7b3d844dded9ef22515ac8e26b4325f..923378b2dd8fb0569a0af674bdc0d23e3db2a7b7 100644
--- a/src/cmd/cgo/internal/swig/swig_test.go
+++ b/src/cmd/cgo/internal/swig/swig_test.go
@@ -44,11 +44,18 @@ 	runArgs := append([]string{"run", "."}, args...)
 	cmd := exec.Command("go", runArgs...)
 	cmd.Dir = dir
 	if lto {
+		// On the builders we're using the default /usr/bin/ld, but
+		// that has problems when asking for LTO in particular. Force
+		// use of lld, which ships with our clang installation.
+		extraLDFlags := ""
+		if strings.Contains(testenv.Builder(), "clang") {
+			extraLDFlags += " -fuse-ld=lld"
+		}
 		const cflags = "-flto -Wno-lto-type-mismatch -Wno-unknown-warning-option"
 		cmd.Env = append(cmd.Environ(),
 			"CGO_CFLAGS="+cflags,
 			"CGO_CXXFLAGS="+cflags,
-			"CGO_LDFLAGS="+cflags)
+			"CGO_LDFLAGS="+cflags+extraLDFlags)
 	}
 	out, err := cmd.CombinedOutput()
 	if string(out) != "OK\n" {