powerpc: Janky segmented stack support

Author: richo

src/libstd/sys/common/stack.rs

@@ -231,6 +231,12 @@ pub unsafe fn record_sp_limit(limit: uint) {
     unsafe fn target_record_sp_limit(_: uint) {
     }
 
+    // powerpc - FIXME(POWERPC): missing...
+    #[cfg(target_arch = "powerpc")]
+    unsafe fn target_record_sp_limit(_: uint) {
+    }
+
+
     // iOS segmented stack is disabled for now, see related notes
     #[cfg(all(target_arch = "arm", target_os = "ios"))] #[inline(always)]
     unsafe fn target_record_sp_limit(_: uint) {
@@ -326,6 +332,12 @@ pub unsafe fn get_sp_limit() -> uint {
         1024
     }
 
+    // powepc - FIXME(POWERPC): missing...
+    #[cfg(target_arch = "powerpc")]
+    unsafe fn target_get_sp_limit() -> uint {
+        1024
+    }
+
     // iOS doesn't support segmented stacks yet. This function might
     // be called by runtime though so it is unsafe to mark it as
     // unreachable, let's return a fixed constant.