diff --git a/misc/cgo/errors/issue14669.go b/misc/cgo/errors/issue14669.go
new file mode 100644
index 00000000000..04d2bcb631d
--- /dev/null
+++ b/misc/cgo/errors/issue14669.go
@@ -0,0 +1,23 @@
+// Copyright 2016 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.
+
+// Issue 14669: test that fails when build with CGO_CFLAGS selecting
+// optimization.
+
+package p
+
+/*
+const int E = 1;
+
+typedef struct s {
+	int       c;
+} s;
+*/
+import "C"
+
+func F() {
+	_ = C.s{
+		c: C.E,
+	}
+}
diff --git a/misc/cgo/errors/test.bash b/misc/cgo/errors/test.bash
index cd358a10f81..643d0382050 100755
--- a/misc/cgo/errors/test.bash
+++ b/misc/cgo/errors/test.bash
@@ -45,6 +45,13 @@ expect issue13129.go C.ushort
 check issue13423.go
 expect issue13635.go C.uchar C.schar C.ushort C.uint C.ulong C.longlong C.ulonglong C.complexfloat C.complexdouble
 
+if ! go build issue14669.go; then
+	exit 1
+fi
+if ! CGO_CFLAGS="-O" go build issue14669.go; then
+	exit 1
+fi
+
 if ! go run ptr.go; then
 	exit 1
 fi
diff --git a/src/cmd/cgo/gcc.go b/src/cmd/cgo/gcc.go
index 97ef824c934..451798244f6 100644
--- a/src/cmd/cgo/gcc.go
+++ b/src/cmd/cgo/gcc.go
@@ -1243,12 +1243,20 @@ func (p *Package) gccErrors(stdin []byte) string {
 	// TODO(rsc): require failure
 	args := p.gccCmd()
 
+	// Optimization options can confuse the error messages; remove them.
+	nargs := make([]string, 0, len(args))
+	for _, arg := range args {
+		if !strings.HasPrefix(arg, "-O") {
+			nargs = append(nargs, arg)
+		}
+	}
+
 	if *debugGcc {
-		fmt.Fprintf(os.Stderr, "$ %s <<EOF\n", strings.Join(args, " "))
+		fmt.Fprintf(os.Stderr, "$ %s <<EOF\n", strings.Join(nargs, " "))
 		os.Stderr.Write(stdin)
 		fmt.Fprint(os.Stderr, "EOF\n")
 	}
-	stdout, stderr, _ := run(stdin, args)
+	stdout, stderr, _ := run(stdin, nargs)
 	if *debugGcc {
 		os.Stderr.Write(stdout)
 		os.Stderr.Write(stderr)