Add Go frontend, libgo library, and Go testsuite.

gcc/:
	* gcc.c (default_compilers): Add entry for ".go".
	* common.opt: Add -static-libgo as a driver option.
	* doc/install.texi (Configuration): Mention libgo as an option for
	--enable-shared.  Mention go as an option for --enable-languages.
	* doc/invoke.texi (Overall Options): Mention .go as a file name
	suffix.  Mention go as a -x option.
	* doc/frontends.texi (G++ and GCC): Mention Go as a supported
	language.
	* doc/sourcebuild.texi (Top Level): Mention libgo.
	* doc/standards.texi (Standards): Add section on Go language.
	Move references for other languages into their own section.
	* doc/contrib.texi (Contributors): Mention that I contributed the
	Go frontend.
gcc/testsuite/:
	* lib/go.exp: New file.
	* lib/go-dg.exp: New file.
	* lib/go-torture.exp: New file.
	* lib/target-supports.exp (check_compile): Match // Go.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@167407 138bc75d-0d04-0410-961f-82ee72b054a4

3 files changed, 91 insertions, 0 deletions

diff --git a/libgo/go/os/signal/mkunix.sh b/libgo/go/os/signal/mkunix.sh
new file mode 100644
index 00000000000..ec5c9d6808e
--- /dev/null
+++ b/libgo/go/os/signal/mkunix.sh
@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+# Copyright 2010 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.
+
+echo '// ./mkunix.sh' "$1"
+echo '// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT'
+echo
+
+cat <<EOH
+package signal
+
+import (
+  "syscall"
+)
+
+var _ = syscall.Syscall  // in case there are zero signals
+
+const (
+EOH
+
+sed -n 's/^const[ 	]*\(SIG[A-Z0-9][A-Z0-9]*\)[ 	].*/  \1 = UnixSignal(syscall.\1)/p' "$1"
+
+echo ")"
diff --git a/libgo/go/os/signal/signal.go b/libgo/go/os/signal/signal.go
new file mode 100644
index 00000000000..666c03e73c4
--- /dev/null
+++ b/libgo/go/os/signal/signal.go
@@ -0,0 +1,48 @@
+// Copyright 2009 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 signal implements operating system-independent signal handling.
+package signal
+
+import (
+	"runtime"
+	"strconv"
+)
+
+// A Signal can represent any operating system signal.
+type Signal interface {
+	String() string
+}
+
+type UnixSignal int32
+
+func (sig UnixSignal) String() string {
+	s := runtime.Signame(int32(sig))
+	if len(s) > 0 {
+		return s
+	}
+	return "Signal " + strconv.Itoa(int(sig))
+}
+
+// Incoming is the global signal channel.
+// All signals received by the program will be delivered to this channel.
+var Incoming <-chan Signal
+
+func process(ch chan<- Signal) {
+	for {
+		var mask uint32 = runtime.Sigrecv()
+		for sig := uint(0); sig < 32; sig++ {
+			if mask&(1<<sig) != 0 {
+				ch <- UnixSignal(sig)
+			}
+		}
+	}
+}
+
+func init() {
+	runtime.Siginit()
+	ch := make(chan Signal) // Done here so Incoming can have type <-chan Signal
+	Incoming = ch
+	go process(ch)
+}
diff --git a/libgo/go/os/signal/signal_test.go b/libgo/go/os/signal/signal_test.go
new file mode 100644
index 00000000000..f2679f14dc6
--- /dev/null
+++ b/libgo/go/os/signal/signal_test.go
@@ -0,0 +1,19 @@
+// Copyright 2009 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 signal
+
+import (
+	"syscall"
+	"testing"
+)
+
+func TestSignal(t *testing.T) {
+	// Send this process a SIGHUP.
+	syscall.Syscall(syscall.SYS_KILL, uintptr(syscall.Getpid()), syscall.SIGHUP, 0)
+
+	if sig := (<-Incoming).(UnixSignal); sig != SIGHUP {
+		t.Errorf("signal was %v, want %v", sig, SIGHUP)
+	}
+}