From 2115f514d047df9c0e7679e2d0df05781b4b961c Mon Sep 17 00:00:00 2001
From: Eden Li <eden.li@gmail.com>
Date: Tue, 17 Nov 2009 23:42:21 -0800
Subject: [PATCH] cgo no longer translates function args that are void* into
 unsafe.Pointer. Fixes #254.

R=rsc
https://golang.org/cl/157060
---
 src/cmd/cgo/gcc.go | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/cmd/cgo/gcc.go b/src/cmd/cgo/gcc.go
index d6b5c6bc85..79dcd29a96 100644
--- a/src/cmd/cgo/gcc.go
+++ b/src/cmd/cgo/gcc.go
@@ -552,7 +552,11 @@ func (c *typeConv) FuncArg(dtype dwarf.Type) *Type {
 		// is type T defined as *X, simulate a little of the
 		// laxness of C by making the argument *X instead of T.
 		if ptr, ok := base(dt.Type).(*dwarf.PtrType); ok {
-			return c.Type(ptr)
+			// Unless the typedef happens to point to void* since
+			// Go has special rules around using unsafe.Pointer.
+			if _, void := base(ptr.Type).(*dwarf.VoidType); !void {
+				return c.Type(ptr)
+			}
 		}
 	}
 	return t;