Index: gcc/go/gofrontend/MERGE
===================================================================
--- gcc/go/gofrontend/MERGE	(revision 229616)
+++ gcc/go/gofrontend/MERGE	(working copy)
@@ -1,4 +1,4 @@
-4b6b496579225cdd897130f6d6fd18ecb100bf99
+17cc10f7fb07e3f37448feaeb416b52618ae8bbb
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.
Index: libgo/MERGE
===================================================================
--- libgo/MERGE	(revision 229616)
+++ libgo/MERGE	(working copy)
@@ -1,4 +1,4 @@
-bb03defe933c89fee44be675d7aa0fbd893ced30
+f2e4c8b5fb3660d793b2c545ef207153db0a34b1
 
 The first line of this file holds the git revision number of the
 last merge done from the master library sources.
Index: libgo/VERSION
===================================================================
--- libgo/VERSION	(revision 229616)
+++ libgo/VERSION	(working copy)
@@ -1 +1 @@
-go1.5
\ No newline at end of file
+go1.5.1
\ No newline at end of file
Index: libgo/go/cmd/go/alldocs.go
===================================================================
--- libgo/go/cmd/go/alldocs.go	(revision 229616)
+++ libgo/go/cmd/go/alldocs.go	(working copy)
@@ -81,7 +81,6 @@ and test commands:
 
 	-a
 		force rebuilding of packages that are already up-to-date.
-		In Go releases, does not apply to the standard library.
 	-n
 		print the commands but do not run them.
 	-p n
Index: libgo/go/cmd/go/build.go
===================================================================
--- libgo/go/cmd/go/build.go	(revision 229616)
+++ libgo/go/cmd/go/build.go	(working copy)
@@ -60,7 +60,6 @@ and test commands:
 
 	-a
 		force rebuilding of packages that are already up-to-date.
-		In Go releases, does not apply to the standard library.
 	-n
 		print the commands but do not run them.
 	-p n
Index: libgo/go/cmd/go/pkg.go
===================================================================
--- libgo/go/cmd/go/pkg.go	(revision 229616)
+++ libgo/go/cmd/go/pkg.go	(working copy)
@@ -372,7 +372,8 @@ func loadImport(path, srcDir string, par
 	if gobin != "" {
 		bp.BinDir = gobin
 	}
-	if err == nil && !isLocal && bp.ImportComment != "" && bp.ImportComment != path && (!go15VendorExperiment || !strings.Contains(path, "/vendor/")) {
+	if err == nil && !isLocal && bp.ImportComment != "" && bp.ImportComment != path &&
+		(!go15VendorExperiment || (!strings.Contains(path, "/vendor/") && !strings.HasPrefix(path, "vendor/"))) {
 		err = fmt.Errorf("code in directory %s expects import %q", bp.Dir, bp.ImportComment)
 	}
 	p.load(stk, bp, err)
Index: libgo/go/fmt/scan.go
===================================================================
--- libgo/go/fmt/scan.go	(revision 229616)
+++ libgo/go/fmt/scan.go	(working copy)
@@ -83,6 +83,8 @@ func Scanln(a ...interface{}) (n int, er
 // the format.  It returns the number of items successfully scanned.
 // If that is less than the number of arguments, err will report why.
 // Newlines in the input must match newlines in the format.
+// The one exception: the verb %c always scans the next rune in the
+// input, even if it is a space (or tab etc.) or newline.
 func Scanf(format string, a ...interface{}) (n int, err error) {
 	return Fscanf(os.Stdin, format, a...)
 }
@@ -1164,15 +1166,18 @@ func (s *ss) doScanf(format string, a []
 		if !widPresent {
 			s.maxWid = hugeWid
 		}
-		s.SkipSpace()
+
+		c, w := utf8.DecodeRuneInString(format[i:])
+		i += w
+
+		if c != 'c' {
+			s.SkipSpace()
+		}
 		s.argLimit = s.limit
 		if f := s.count + s.maxWid; f < s.argLimit {
 			s.argLimit = f
 		}
 
-		c, w := utf8.DecodeRuneInString(format[i:])
-		i += w
-
 		if numProcessed >= len(a) { // out of operands
 			s.errorString("too few operands for format %" + format[i-w:])
 			break
Index: libgo/go/fmt/scan_test.go
===================================================================
--- libgo/go/fmt/scan_test.go	(revision 229616)
+++ libgo/go/fmt/scan_test.go	(working copy)
@@ -300,10 +300,13 @@ var scanfTests = []ScanfTest{
 	{"%2s", "sssss", &xVal, Xs("ss")},
 
 	// Fixed bugs
-	{"%d\n", "27\n", &intVal, 27},  // ok
-	{"%d\n", "28 \n", &intVal, 28}, // was: "unexpected newline"
-	{"%v", "0", &intVal, 0},        // was: "EOF"; 0 was taken as base prefix and not counted.
-	{"%v", "0", &uintVal, uint(0)}, // was: "EOF"; 0 was taken as base prefix and not counted.
+	{"%d\n", "27\n", &intVal, 27},      // ok
+	{"%d\n", "28 \n", &intVal, 28},     // was: "unexpected newline"
+	{"%v", "0", &intVal, 0},            // was: "EOF"; 0 was taken as base prefix and not counted.
+	{"%v", "0", &uintVal, uint(0)},     // was: "EOF"; 0 was taken as base prefix and not counted.
+	{"%c", " ", &uintVal, uint(' ')},   // %c must accept a blank.
+	{"%c", "\t", &uintVal, uint('\t')}, // %c must accept any space.
+	{"%c", "\n", &uintVal, uint('\n')}, // %c must accept any space.
 }
 
 var overflowTests = []ScanTest{
Index: libgo/go/internal/syscall/windows/registry/value.go
===================================================================
--- libgo/go/internal/syscall/windows/registry/value.go	(revision 229616)
+++ libgo/go/internal/syscall/windows/registry/value.go	(working copy)
@@ -310,7 +310,6 @@ loopItems:
 				break
 			}
 			if err == syscall.ERROR_MORE_DATA {
-				println(len(buf), l)
 				// Double buffer size and try again.
 				l = uint32(2 * len(buf))
 				buf = make([]uint16, l)
Index: libgo/go/net/cgo_solaris.go
===================================================================
--- libgo/go/net/cgo_solaris.go	(revision 229616)
+++ libgo/go/net/cgo_solaris.go	(working copy)
@@ -7,7 +7,7 @@
 package net
 
 /*
-#cgo LDFLAGS: -lsocket -lnsl
+#cgo LDFLAGS: -lsocket -lnsl -lsendfile
 #include <netdb.h>
 */
 
Index: libgo/go/net/http/httputil/reverseproxy.go
===================================================================
--- libgo/go/net/http/httputil/reverseproxy.go	(revision 229616)
+++ libgo/go/net/http/httputil/reverseproxy.go	(working copy)
@@ -105,7 +105,7 @@ type requestCanceler interface {
 }
 
 type runOnFirstRead struct {
-	io.Reader
+	io.Reader // optional; nil means empty body
 
 	fn func() // Run before first Read, then set to nil
 }
@@ -115,6 +115,9 @@ func (c *runOnFirstRead) Read(bs []byte)
 		c.fn()
 		c.fn = nil
 	}
+	if c.Reader == nil {
+		return 0, io.EOF
+	}
 	return c.Reader.Read(bs)
 }
 
Index: libgo/go/net/http/httputil/reverseproxy_test.go
===================================================================
--- libgo/go/net/http/httputil/reverseproxy_test.go	(revision 229616)
+++ libgo/go/net/http/httputil/reverseproxy_test.go	(working copy)
@@ -7,6 +7,7 @@
 package httputil
 
 import (
+	"bufio"
 	"io/ioutil"
 	"log"
 	"net/http"
@@ -281,3 +282,41 @@ func TestReverseProxyCancellation(t *tes
 		t.Fatal("DefaultClient.Do() returned nil error")
 	}
 }
+
+func req(t *testing.T, v string) *http.Request {
+	req, err := http.ReadRequest(bufio.NewReader(strings.NewReader(v)))
+	if err != nil {
+		t.Fatal(err)
+	}
+	return req
+}
+
+// Issue 12344
+func TestNilBody(t *testing.T) {
+	backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("hi"))
+	}))
+	defer backend.Close()
+
+	frontend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		backURL, _ := url.Parse(backend.URL)
+		rp := NewSingleHostReverseProxy(backURL)
+		r := req(t, "GET / HTTP/1.0\r\n\r\n")
+		r.Body = nil // this accidentally worked in Go 1.4 and below, so keep it working
+		rp.ServeHTTP(w, r)
+	}))
+	defer frontend.Close()
+
+	res, err := http.Get(frontend.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer res.Body.Close()
+	slurp, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if string(slurp) != "hi" {
+		t.Errorf("Got %q; want %q", slurp, "hi")
+	}
+}
Index: libgo/go/net/lookup.go
===================================================================
--- libgo/go/net/lookup.go	(revision 229616)
+++ libgo/go/net/lookup.go	(working copy)
@@ -123,6 +123,9 @@ func lookupIPDeadline(host string, deadl
 
 // LookupPort looks up the port for the given network and service.
 func LookupPort(network, service string) (port int, err error) {
+	if n, i, ok := dtoi(service, 0); ok && i == len(service) {
+		return n, nil
+	}
 	return lookupPort(network, service)
 }
 
Index: libgo/go/net/port_test.go
===================================================================
--- libgo/go/net/port_test.go	(revision 229616)
+++ libgo/go/net/port_test.go	(working copy)
@@ -27,6 +27,7 @@ var portTests = []struct {
 	{"tcp", "time", 37, true},
 	{"tcp", "domain", 53, true},
 	{"tcp", "finger", 79, true},
+	{"tcp", "42", 42, true},
 
 	{"udp", "echo", 7, true},
 	{"udp", "tftp", 69, true},
@@ -36,6 +37,7 @@ var portTests = []struct {
 	{"udp", "ntp", 123, true},
 	{"udp", "snmp", 161, true},
 	{"udp", "syslog", 514, true},
+	{"udp", "42", 42, true},
 
 	{"--badnet--", "zzz", 0, false},
 	{"tcp", "--badport--", 0, false},
Index: libgo/go/runtime/extern.go
===================================================================
--- libgo/go/runtime/extern.go	(revision 229616)
+++ libgo/go/runtime/extern.go	(working copy)
@@ -47,6 +47,9 @@ It is a comma-separated list of name=val
 	that allow the garbage collector to avoid repeating a stack scan during the
 	mark termination phase.
 
+	gcstackbarrierall: setting gcstackbarrierall=1 installs stack barriers
+	in every stack frame, rather than in exponentially-spaced frames.
+
 	gcstoptheworld: setting gcstoptheworld=1 disables concurrent garbage collection,
 	making every garbage collection a stop-the-world event. Setting gcstoptheworld=2
 	also disables concurrent sweeping after the garbage collection finishes.
Index: libgo/go/runtime/gc_test.go
===================================================================
--- libgo/go/runtime/gc_test.go	(revision 229616)
+++ libgo/go/runtime/gc_test.go	(working copy)
@@ -471,4 +471,21 @@ func testAssertVar(x interface{}) error
 	return nil
 }
 
+func TestAssertE2T2Liveness(t *testing.T) {
+	*runtime.TestingAssertE2T2GC = true
+	defer func() {
+		*runtime.TestingAssertE2T2GC = false
+	}()
+
+	poisonStack()
+	testIfaceEqual(io.EOF)
+}
+
+func testIfaceEqual(x interface{}) {
+	if x == "abc" {
+		// Prevent inlining
+		panic("")
+	}
+}
+
 */