diff --git a/gcc/go/gofrontend/MERGE b/gcc/go/gofrontend/MERGE
index bdaea8180f4..edffc11eec1 100644
--- a/gcc/go/gofrontend/MERGE
+++ b/gcc/go/gofrontend/MERGE
@@ -1,4 +1,4 @@
-2aa95f1499cf931ef8e95c7958463829276a0f2c
+7e94bac5676afc8188677c98ecb263c78c1a7f8d
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
diff --git a/libgo/go/runtime/crash_gccgo_test.go b/libgo/go/runtime/crash_gccgo_test.go
new file mode 100644
index 00000000000..c216e542ce8
--- /dev/null
+++ b/libgo/go/runtime/crash_gccgo_test.go
@@ -0,0 +1,59 @@
+// Copyright 2018 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.
+
+// +build cgo,gccgo
+
+package runtime_test
+
+import (
+	"bytes"
+	"fmt"
+	"internal/testenv"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+)
+
+func TestGccgoCrashTraceback(t *testing.T) {
+	t.Parallel()
+	got := runTestProg(t, "testprogcgo", "CrashTracebackGccgo")
+	ok := true
+	for i := 1; i <= 3; i++ {
+		if !strings.Contains(got, fmt.Sprintf("CFunction%d", i)) {
+			t.Errorf("missing C function CFunction%d", i)
+			ok = false
+		}
+	}
+	if !ok {
+		t.Log(got)
+	}
+}
+
+func TestGccgoCrashTracebackNodebug(t *testing.T) {
+	testenv.MustHaveGoBuild(t)
+	if os.Getenv("CC") == "" {
+		t.Skip("no compiler in environment")
+	}
+
+	cc := strings.Fields(os.Getenv("CC"))
+	cc = append(cc, "-x", "c++", "-")
+	out, _ := exec.Command(cc[0], cc[1:]...).CombinedOutput()
+	if bytes.Contains(out, []byte("error trying to exec 'cc1plus'")) {
+		t.Skip("no C++ compiler")
+	}
+	os.Setenv("CXX", os.Getenv("CC"))
+
+	got := runTestProg(t, "testprogcxx", "CrashTracebackNodebug")
+	ok := true
+	for i := 1; i <= 3; i++ {
+		if !strings.Contains(got, fmt.Sprintf("cxxFunction%d", i)) {
+			t.Errorf("missing C++ function cxxFunction%d", i)
+			ok = false
+		}
+	}
+	if !ok {
+		t.Log(got)
+	}
+}
diff --git a/libgo/go/runtime/testdata/testprogcgo/traceback_gccgo.go b/libgo/go/runtime/testdata/testprogcgo/traceback_gccgo.go
new file mode 100644
index 00000000000..83357fdd5d9
--- /dev/null
+++ b/libgo/go/runtime/testdata/testprogcgo/traceback_gccgo.go
@@ -0,0 +1,40 @@
+// Copyright 2018 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.
+
+// +build gccgo
+
+package main
+
+// This program will crash.
+// We want the stack trace to include the C functions.
+
+/*
+#cgo CFLAGS: -g -O0
+
+#include <stdint.h>
+
+char *p;
+
+static int CFunction3(void) {
+	*p = 0;
+	return 0;
+}
+
+static int CFunction2(void) {
+	return CFunction3();
+}
+
+static int CFunction1(void) {
+	return CFunction2();
+}
+*/
+import "C"
+
+func init() {
+	register("CrashTracebackGccgo", CrashTracebackGccgo)
+}
+
+func CrashTracebackGccgo() {
+	C.CFunction1()
+}
diff --git a/libgo/go/runtime/testdata/testprogcxx/main.go b/libgo/go/runtime/testdata/testprogcxx/main.go
new file mode 100644
index 00000000000..0ecab1079c6
--- /dev/null
+++ b/libgo/go/runtime/testdata/testprogcxx/main.go
@@ -0,0 +1,35 @@
+// Copyright 2018 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.
+
+package main
+
+import "os"
+
+var cmds = map[string]func(){}
+
+func register(name string, f func()) {
+	if cmds[name] != nil {
+		panic("duplicate registration: " + name)
+	}
+	cmds[name] = f
+}
+
+func registerInit(name string, f func()) {
+	if len(os.Args) >= 2 && os.Args[1] == name {
+		f()
+	}
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		println("usage: " + os.Args[0] + " name-of-test")
+		return
+	}
+	f := cmds[os.Args[1]]
+	if f == nil {
+		println("unknown function: " + os.Args[1])
+		return
+	}
+	f()
+}
diff --git a/libgo/go/runtime/testdata/testprogcxx/traceback.cc b/libgo/go/runtime/testdata/testprogcxx/traceback.cc
new file mode 100644
index 00000000000..d4bd26cf768
--- /dev/null
+++ b/libgo/go/runtime/testdata/testprogcxx/traceback.cc
@@ -0,0 +1,19 @@
+// Copyright 2018 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.
+
+char *p;
+
+static int cxxFunction3() {
+	*p = 0;
+	return 0;
+}
+
+static int cxxFunction2() {
+	return cxxFunction3();
+}
+
+extern "C"
+int cxxFunction1() {
+	return cxxFunction2();
+}
diff --git a/libgo/go/runtime/testdata/testprogcxx/traceback.go b/libgo/go/runtime/testdata/testprogcxx/traceback.go
new file mode 100644
index 00000000000..0e40ca8ffbb
--- /dev/null
+++ b/libgo/go/runtime/testdata/testprogcxx/traceback.go
@@ -0,0 +1,24 @@
+// Copyright 2018 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.
+
+package main
+
+// This program will crash.
+// We want the stack trace to include the C++ functions,
+// even though we compile with -g0.
+
+/*
+#cgo CXXFLAGS: -g0 -O0
+
+extern int cxxFunction1(void);
+*/
+import "C"
+
+func init() {
+	register("CrashTracebackNodebug", CrashTracebackNodebug)
+}
+
+func CrashTracebackNodebug() {
+	C.cxxFunction1()
+}
diff --git a/libgo/runtime/go-callers.c b/libgo/runtime/go-callers.c
index 2eaac682779..590315376e3 100644
--- a/libgo/runtime/go-callers.c
+++ b/libgo/runtime/go-callers.c
@@ -143,6 +143,20 @@ callback (void *data, uintptr_t pc, const char *filename, int lineno,
   return arg->index >= arg->max;
 }
 
+/* Syminfo callback.  */
+
+static void
+syminfo_fnname_callback (void *data, uintptr_t pc __attribute__ ((unused)),
+			 const char *symname,
+			 uintptr_t address __attribute__ ((unused)),
+			 uintptr_t size __attribute__ ((unused)))
+{
+  Location* locptr = (Location*) data;
+
+  if (symname != NULL)
+    locptr->function = runtime_gostringnocopy ((const byte *) symname);
+}
+
 /* Error callback.  */
 
 static void
@@ -179,15 +193,17 @@ int32
 runtime_callers (int32 skip, Location *locbuf, int32 m, bool keep_thunks)
 {
   struct callers_data data;
+  struct backtrace_state* state;
+  int32 i;
 
   data.locbuf = locbuf;
   data.skip = skip + 1;
   data.index = 0;
   data.max = m;
   data.keep_thunks = keep_thunks;
+  state = __go_get_backtrace_state ();
   runtime_xadd (&runtime_in_callers, 1);
-  backtrace_full (__go_get_backtrace_state (), 0, callback, error_callback,
-		  &data);
+  backtrace_full (state, 0, callback, error_callback, &data);
   runtime_xadd (&runtime_in_callers, -1);
 
   /* For some reason GCC sometimes loses the name of a thunk function
@@ -204,6 +220,18 @@ runtime_callers (int32 skip, Location *locbuf, int32 m, bool keep_thunks)
       --data.index;
     }
 
+  /* Try to use backtrace_syminfo to fill in any missing function
+     names.  This can happen when tracing through an object which has
+     no debug info; backtrace_syminfo will look at the symbol table to
+     get the name.  This should only happen when tracing through code
+     that is not written in Go and is not part of libgo.  */
+  for (i = 0; i < data.index; ++i)
+    {
+      if (locbuf[i].function.len == 0 && locbuf[i].pc != 0)
+	backtrace_syminfo (state, locbuf[i].pc, syminfo_fnname_callback,
+			   error_callback, &locbuf[i]);
+    }
+
   return data.index;
 }
 
diff --git a/libgo/testsuite/gotest b/libgo/testsuite/gotest
index f5c908adef8..f978042cccc 100755
--- a/libgo/testsuite/gotest
+++ b/libgo/testsuite/gotest
@@ -348,18 +348,18 @@ x)
 			fi
 			match=false
 			;;
-		    $goos | $goarch | cgo | go1.[0-9])
+		    $goos | $goarch | cgo | gccgo | go1.[0-9])
 			match=true
 			;;
-		    "!"$goos | "!"$goarch | "!cgo" | "!"go1.[0-9])
+		    "!"$goos | "!"$goarch | "!cgo" | "!gccgo" | "!"go1.[0-9])
 			;;
 		    *,*)
 			cmatch=true
 			for ctag in `echo $tag | sed -e 's/,/ /g'`; do
 			    case $ctag in
-			    $goos | $goarch | cgo | go1.[0-9])
+			    $goos | $goarch | cgo | gccgo | go1.[0-9])
 				;;
-			    "!"$goos | "!"$goarch | "!cgo" | "!"go1.[0-9])
+			    "!"$goos | "!"$goarch | "!cgo" | "!gccgo" | "!"go1.[0-9])
 				cmatch=false
 				;;
 			    "!"*)