auto merge of #8285 : huonw/rust/deriving+++, r=alexcrichton

Some general clean-up relating to deriving:
- `TotalOrd` was too eager, and evaluated the `.cmp` call for every field, even if it could short-circuit earlier.
- the pointer types didn't have impls for `TotalOrd` or `TotalEq`.
- the Makefiles didn't reach deep enough into libsyntax for dependencies.

(Split out from https://github.com/mozilla/rust/pull/8258.)

src/libstd/borrow.rs

@@ -58,3 +58,15 @@ impl<'self, T: Ord> Ord for &'self T {
         *(*self) > *(*other)
     }
 }
+
+#[cfg(not(test))]
+impl<'self, T: TotalOrd> TotalOrd for &'self T {
+    #[inline]
+    fn cmp(&self, other: & &'self T) -> Ordering { (**self).cmp(*other) }
+}
+
+#[cfg(not(test))]
+impl<'self, T: TotalEq> TotalEq for &'self T {
+    #[inline]
+    fn equals(&self, other: & &'self T) -> bool { (**self).equals(*other) }
+}

src/libstd/cmp.rs

@@ -153,7 +153,6 @@ pub fn cmp2<A:TotalOrd,B:TotalOrd>(
 Return `o1` if it is not `Equal`, otherwise `o2`. Simulates the
 lexical ordering on a type `(int, int)`.
 */
-// used in deriving code in libsyntax
 #[inline]
 pub fn lexical_ordering(o1: Ordering, o2: Ordering) -> Ordering {
     match o1 {

src/libstd/managed.rs

@@ -12,7 +12,7 @@
 
 use ptr::to_unsafe_ptr;
 
-#[cfg(not(test))] use cmp::{Eq, Ord};
+#[cfg(not(test))] use cmp::*;
 
 pub static RC_MANAGED_UNIQUE : uint = (-2) as uint;
 pub static RC_IMMORTAL : uint = 0x77777777;
@@ -71,6 +71,29 @@ impl<T:Ord> Ord for @mut T {
     fn gt(&self, other: &@mut T) -> bool { *(*self) > *(*other) }
 }
 
+#[cfg(not(test))]
+impl<T: TotalOrd> TotalOrd for @T {
+    #[inline]
+    fn cmp(&self, other: &@T) -> Ordering { (**self).cmp(*other) }
+}
+
+#[cfg(not(test))]
+impl<T: TotalOrd> TotalOrd for @mut T {
+    #[inline]
+    fn cmp(&self, other: &@mut T) -> Ordering { (**self).cmp(*other) }
+}
+
+#[cfg(not(test))]
+impl<T: TotalEq> TotalEq for @T {
+    #[inline]
+    fn equals(&self, other: &@T) -> bool { (**self).equals(*other) }
+}
+
+#[cfg(not(test))]
+impl<T: TotalEq> TotalEq for @mut T {
+    #[inline]
+    fn equals(&self, other: &@mut T) -> bool { (**self).equals(*other) }
+}
 #[test]
 fn test() {
     let x = @3;

src/libstd/owned.rs

@@ -10,7 +10,7 @@
 
 //! Operations on unique pointer types
 
-#[cfg(not(test))] use cmp::{Eq, Ord};
+#[cfg(not(test))] use cmp::*;
 
 #[cfg(not(test))]
 impl<T:Eq> Eq for ~T {
@@ -31,3 +31,15 @@ impl<T:Ord> Ord for ~T {
     #[inline]
     fn gt(&self, other: &~T) -> bool { *(*self) > *(*other) }
 }
+
+#[cfg(not(test))]
+impl<T: TotalOrd> TotalOrd for ~T {
+    #[inline]
+    fn cmp(&self, other: &~T) -> Ordering { (**self).cmp(*other) }
+}
+
+#[cfg(not(test))]
+impl<T: TotalEq> TotalEq for ~T {
+    #[inline]
+    fn equals(&self, other: &~T) -> bool { (**self).equals(*other) }
+}