auto merge of #7734 : alexcrichton/rust/issue-3395, r=sanxiyn

Also ends up fixing one case in libstd. 

Closes #3395

Author: bors

src/librustc/middle/lint.rs

@@ -745,6 +745,7 @@ fn check_item_ctypes(cx: &Context, it: &ast::item) {
                     _ => ()
                 }
             }
+            ast::ty_ptr(ref mt) => { check_ty(cx, mt.ty) }
             _ => ()
         }
     }

src/libstd/unstable/global.rs

@@ -28,7 +28,7 @@ avoid hitting the mutex.
 use cast::{transmute};
 use clone::Clone;
 use kinds::Send;
-use libc::{c_void};
+use libc::{c_void, intptr_t};
 use option::{Option, Some, None};
 use ops::Drop;
 use unstable::sync::{Exclusive, exclusive};
@@ -228,7 +228,7 @@ fn key_ptr<T:Send>(key: GlobalDataKey<T>) -> uint {
 }
 
 extern {
-    fn rust_get_global_data_ptr() -> *mut int;
+    fn rust_get_global_data_ptr() -> *mut intptr_t;
 }
 
 #[test]

src/rt/rust_builtin.cpp

@@ -769,7 +769,7 @@ rust_register_exit_function(spawn_fn runner, fn_env_pair *f) {
     task->kernel->register_exit_function(runner, f);
 }
 
-extern "C" void *
+extern "C" intptr_t*
 rust_get_global_data_ptr() {
     rust_task *task = rust_get_current_task();
     return &task->kernel->global_data;

src/rt/rust_kernel.h

@@ -124,7 +124,7 @@ class rust_kernel {
 
 public:
     struct rust_env *env;
-    uintptr_t global_data;
+    intptr_t global_data;
 
     rust_kernel(rust_env *env);
 

src/test/compile-fail/warn-ctypes-err-attr.rs renamed to src/test/compile-fail/lint-ctypes.rs

@@ -8,14 +8,19 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// error-pattern:found rust type
 #[deny(ctypes)];
 
-mod libc {
-    #[nolink]
-    pub extern {
-        pub fn malloc(size: int) -> *u8;
-    }
+use std::libc;
+
+#[nolink]
+extern {
+    pub fn bare_type1(size: int); //~ ERROR: found rust type
+    pub fn bare_type2(size: uint); //~ ERROR: found rust type
+    pub fn ptr_type1(size: *int); //~ ERROR: found rust type
+    pub fn ptr_type2(size: *uint); //~ ERROR: found rust type
+
+    pub fn good1(size: *libc::c_int);
+    pub fn good2(size: *libc::c_uint);
 }
 
 fn main() {