8c, 8l dynamic loading support.

better mach binaries.
cgo working on darwin+linux amd64+386.
eliminated context switches - pi is 30x faster.
add libcgo to build.

on snow leopard:
  - non-cgo binaries work; all tests pass.
  - cgo binaries work on amd64 but not 386.

R=r
DELTA=2031  (1316 added, 626 deleted, 89 changed)
OCL=35264
CL=35304

1 files changed, 43 insertions, 0 deletions

diff --git a/misc/cgo/stdio/file.go b/misc/cgo/stdio/file.go
new file mode 100644
index 000000000..7935f8f4d
--- /dev/null
+++ b/misc/cgo/stdio/file.go
@@ -0,0 +1,43 @@
+// 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.
+
+/*
+A trivial example of wrapping a C library in Go.
+For a more complex example and explanation,
+see ../gmp/gmp.go.
+*/
+
+package stdio
+
+// TODO(rsc): Remove fflushstdout when C.fflush(C.stdout) works in cgo.
+
+/*
+#include <stdio.h>
+#include <stdlib.h>
+
+void fflushstdout(void) { fflush(stdout); }
+*/
+import "C"
+import "unsafe"
+
+/*
+type File C.FILE
+
+var Stdout = (*File)(C.stdout)
+var Stderr = (*File)(C.stderr)
+
+func (f *File) WriteString(s string) {
+	p := C.CString(s);
+	C.fputs(p, (*C.FILE)(f));
+	C.free(p);
+}
+*/
+
+func Puts(s string) {
+	p := C.CString(s);
+	C.puts(p);
+	C.free(unsafe.Pointer(p));
+	C.fflushstdout();
+}
+