libgo: update to Go 1.8 release candidate 1

    
    Compiler changes:
      * Change map assignment to use mapassign and assign value directly.
      * Change string iteration to use decoderune, faster for ASCII strings.
      * Change makeslice to take int, and use makeslice64 for larger values.
      * Add new noverflow field to hmap struct used for maps.
    
    Unresolved problems, to be fixed later:
      * Commented out test in go/types/sizes_test.go that doesn't compile.
      * Commented out reflect.TestStructOf test for padding after zero-sized field.
    
    Reviewed-on: https://go-review.googlesource.com/35231

gotools/:
	Updates for Go 1.8rc1.
	* Makefile.am (go_cmd_go_files): Add bug.go.
	(s-zdefaultcc): Write defaultPkgConfig.
	* Makefile.in: Rebuild.

From-SVN: r244456

1 files changed, 106 insertions, 0 deletions

diff --git a/libgo/go/os/example_test.go b/libgo/go/os/example_test.go
new file mode 100644
index 00000000000..07f9c769590
--- /dev/null
+++ b/libgo/go/os/example_test.go
@@ -0,0 +1,106 @@
+// 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.
+
+package os_test
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+)
+
+func ExampleOpenFile() {
+	f, err := os.OpenFile("notes.txt", os.O_RDWR|os.O_CREATE, 0755)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := f.Close(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ExampleChmod() {
+	if err := os.Chmod("some-filename", 0644); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ExampleChtimes() {
+	mtime := time.Date(2006, time.February, 1, 3, 4, 5, 0, time.UTC)
+	atime := time.Date(2007, time.March, 2, 4, 5, 6, 0, time.UTC)
+	if err := os.Chtimes("some-filename", atime, mtime); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ExampleFileMode() {
+	fi, err := os.Stat("some-filename")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	switch mode := fi.Mode(); {
+	case mode.IsRegular():
+		fmt.Println("regular file")
+	case mode.IsDir():
+		fmt.Println("directory")
+	case mode&os.ModeSymlink != 0:
+		fmt.Println("symbolic link")
+	case mode&os.ModeNamedPipe != 0:
+		fmt.Println("named pipe")
+	}
+}
+
+func ExampleIsNotExist() {
+	filename := "a-nonexistent-file"
+	if _, err := os.Stat(filename); os.IsNotExist(err) {
+		fmt.Printf("file does not exist")
+	}
+	// Output:
+	// file does not exist
+}
+
+func init() {
+	os.Setenv("USER", "gopher")
+	os.Setenv("HOME", "/usr/gopher")
+	os.Unsetenv("GOPATH")
+}
+
+func ExampleExpandEnv() {
+	fmt.Println(os.ExpandEnv("$USER lives in ${HOME}."))
+
+	// Output:
+	// gopher lives in /usr/gopher.
+}
+
+func ExampleLookupEnv() {
+	show := func(key string) {
+		val, ok := os.LookupEnv(key)
+		if !ok {
+			fmt.Printf("%s not set\n", key)
+		} else {
+			fmt.Printf("%s=%s\n", key, val)
+		}
+	}
+
+	show("USER")
+	show("GOPATH")
+
+	// Output:
+	// USER=gopher
+	// GOPATH not set
+}
+
+func ExampleGetenv() {
+	fmt.Printf("%s lives in %s.\n", os.Getenv("USER"), os.Getenv("HOME"))
+
+	// Output:
+	// gopher lives in /usr/gopher.
+}
+
+func ExampleUnsetenv() {
+	os.Setenv("TMPDIR", "/my/tmp")
+	defer os.Unsetenv("TMPDIR")
+}