libgo: update to Go1.12beta2

    
    Reviewed-on: https://go-review.googlesource.com/c/158019

gotools/:
	* Makefile.am (go_cmd_vet_files): Update for Go1.12beta2 release.
	(GOTOOLS_TEST_TIMEOUT): Increase to 600.
	(check-runtime): Export LD_LIBRARY_PATH before computing GOARCH
	and GOOS.
	(check-vet): Copy golang.org/x/tools into check-vet-dir.
	* Makefile.in: Regenerate.

gcc/testsuite/:
	* go.go-torture/execute/names-1.go: Stop using debug/xcoff, which
	is no longer externally visible.

From-SVN: r268084

1 files changed, 7 insertions, 12 deletions

diff --git a/libgo/go/internal/poll/writev.go b/libgo/go/internal/poll/writev.go
index 4bf8804e..04e3522 100644
--- a/libgo/go/internal/poll/writev.go
+++ b/libgo/go/internal/poll/writev.go
@@ -9,7 +9,6 @@ package poll
 import (
 	"io"
 	"syscall"
-	"unsafe"
 )
 
 // Writev wraps the writev system call.
@@ -54,24 +53,20 @@ func (fd *FD) Writev(v *[][]byte) (int64, error) {
 		}
 		fd.iovecs = &iovecs // cache
 
-		wrote, _, e0 := syscall.Syscall(syscall.SYS_WRITEV,
-			uintptr(fd.Sysfd),
-			uintptr(unsafe.Pointer(&iovecs[0])),
-			uintptr(len(iovecs)))
+		var wrote uintptr
+		wrote, err = writev(fd.Sysfd, iovecs)
 		if wrote == ^uintptr(0) {
 			wrote = 0
 		}
 		TestHookDidWritev(int(wrote))
 		n += int64(wrote)
 		consume(v, int64(wrote))
-		if e0 == syscall.EAGAIN {
-			if err = fd.pd.waitWrite(fd.isFile); err == nil {
-				continue
-			}
-		} else if e0 != 0 {
-			err = syscall.Errno(e0)
-		}
 		if err != nil {
+			if err.(syscall.Errno) == syscall.EAGAIN {
+				if err = fd.pd.waitWrite(fd.isFile); err == nil {
+					continue
+				}
+			}
 			break
 		}
 		if n == 0 {