libgo: update to Go1.10beta1

    
    Update the Go library to the 1.10beta1 release.
    
    Requires a few changes to the compiler for modifications to the map
    runtime code, and to handle some nowritebarrier cases in the runtime.
    
    Reviewed-on: https://go-review.googlesource.com/86455

gotools/:
	* Makefile.am (go_cmd_vet_files): New variable.
	(go_cmd_buildid_files, go_cmd_test2json_files): New variables.
	(s-zdefaultcc): Change from constants to functions.
	(noinst_PROGRAMS): Add vet, buildid, and test2json.
	(cgo$(EXEEXT)): Link against $(LIBGOTOOL).
	(vet$(EXEEXT)): New target.
	(buildid$(EXEEXT)): New target.
	(test2json$(EXEEXT)): New target.
	(install-exec-local): Install all $(noinst_PROGRAMS).
	(uninstall-local): Uninstasll all $(noinst_PROGRAMS).
	(check-go-tool): Depend on $(noinst_PROGRAMS).  Copy down
	objabi.go.
	(check-runtime): Depend on $(noinst_PROGRAMS).
	(check-cgo-test, check-carchive-test): Likewise.
	(check-vet): New target.
	(check): Depend on check-vet.  Look at cmd_vet-testlog.
	(.PHONY): Add check-vet.
	* Makefile.in: Rebuild.

From-SVN: r256365

2 files changed, 91 insertions, 0 deletions

diff --git a/libgo/go/cmd/buildid/buildid.go b/libgo/go/cmd/buildid/buildid.go
new file mode 100644
index 0000000..8d810ff
--- /dev/null
+++ b/libgo/go/cmd/buildid/buildid.go
@@ -0,0 +1,73 @@
+// Copyright 2017 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 (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"strings"
+
+	"cmd/internal/buildid"
+)
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: go tool buildid [-w] file\n")
+	flag.PrintDefaults()
+	os.Exit(2)
+}
+
+var wflag = flag.Bool("w", false, "write build ID")
+
+func main() {
+	log.SetPrefix("buildid: ")
+	log.SetFlags(0)
+	flag.Usage = usage
+	flag.Parse()
+	if flag.NArg() != 1 {
+		usage()
+	}
+
+	file := flag.Arg(0)
+	id, err := buildid.ReadFile(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if !*wflag {
+		fmt.Printf("%s\n", id)
+		return
+	}
+
+	f, err := os.Open(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	matches, hash, err := buildid.FindAndHash(f, id, 0)
+	if err != nil {
+		log.Fatal(err)
+	}
+	f.Close()
+
+	tail := id
+	if i := strings.LastIndex(id, "."); i >= 0 {
+		tail = tail[i+1:]
+	}
+	if len(tail) != len(hash)*2 {
+		log.Fatalf("%s: cannot find %d-byte hash in id %s", file, len(hash), id)
+	}
+	newID := id[:len(id)-len(tail)] + fmt.Sprintf("%x", hash)
+
+	f, err = os.OpenFile(file, os.O_WRONLY, 0)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := buildid.Rewrite(f, matches, newID); err != nil {
+		log.Fatal(err)
+	}
+	if err := f.Close(); err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/libgo/go/cmd/buildid/doc.go b/libgo/go/cmd/buildid/doc.go
new file mode 100644
index 0000000..d1ec155
--- /dev/null
+++ b/libgo/go/cmd/buildid/doc.go
@@ -0,0 +1,18 @@
+// Copyright 2017 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.
+
+/*
+Buildid displays or updates the build ID stored in a Go package or binary.
+
+Usage:
+	go tool buildid [-w] file
+
+By default, buildid prints the build ID found in the named file.
+If the -w option is given, buildid rewrites the build ID found in
+the file to accurately record a content hash of the file.
+
+This tool is only intended for use by the go command or
+other build systems.
+*/
+package main