manage to compile on windows

Use C++ compiler to build.

msgpack/_msgpack.pyx

@@ -222,8 +222,8 @@ def unpackb(object packed, object object_hook=None, object list_hook=None, bint
     template_init(&ctx)
     ctx.user.use_list = use_list
     ctx.user.object_hook = ctx.user.list_hook = NULL
-    ctx.user.encoding = enc
-    ctx.user.unicode_errors = err
+    ctx.user.encoding = <const_char_ptr>enc
+    ctx.user.unicode_errors = <const_char_ptr>err
     if object_hook is not None:
         if not PyCallable_Check(object_hook):
             raise TypeError("object_hook must be a callable.")

msgpack/pack.h

@@ -77,7 +77,7 @@ static inline int msgpack_pack_write(msgpack_packer* pk, const char *data, size_
 
     if (len + l > bs) {
         bs = (len + l) * 2;
-        buf = realloc(buf, bs);
+        buf = (char*)realloc(buf, bs);
         if (!buf) return -1;
     }
     memcpy(buf + len, data, l);

setup.py

@@ -53,6 +53,7 @@ msgpack_mod = Extension('msgpack._msgpack',
                         sources=sources,
                         libraries=libraries,
                         include_dirs=['.'],
+                        language='c++',
                         )
 del sources, libraries