Fix some gcc-4.4-isms, should build now on 4.1+.

Author: graydon

src/rt/rust_internal.h

@@ -38,6 +38,11 @@ extern "C" {
 #include <pthread.h>
 #include <errno.h>
 #include <dirent.h>
+
+#define GCC_VERSION (__GNUC__ * 10000 \
+                     + __GNUC_MINOR__ * 100 \
+                     + __GNUC_PATCHLEVEL__)
+
 #else
 #error "Platform not supported."
 #endif

src/rt/rust_kernel.cpp

@@ -3,11 +3,12 @@
 #define __STDC_LIMIT_MACROS 1
 #endif
 
-#include <vector>
 #include "rust_internal.h"
 #include "rust_util.h"
 #include "rust_scheduler.h"
 
+#include <vector>
+
 #define KLOG_(...)                              \
     KLOG(this, kern, __VA_ARGS__)
 #define KLOG_ERR_(field, ...)                   \

src/rt/rust_upcall.cpp

@@ -34,7 +34,8 @@
 // the rust stack and happen frequently enough to catch most stack changes,
 // including at the beginning of all landing pads.
 // FIXME: Enable this for windows
-#if defined __linux__ || defined __APPLE__ || defined __FreeBSD__
+#if (defined __linux__ || defined __APPLE__ || defined __FreeBSD__) \
+    && (defined(GCC_VERSION) && GCC_VERSION > 40300)
 extern "C" void
 check_stack_alignment() __attribute__ ((aligned (16)));
 #else

src/rt/util/indexed_list.h

@@ -43,6 +43,7 @@ template<typename T> class indexed_list {
     }
     virtual int32_t remove(T* value);
     virtual T * operator[](int32_t index);
+    virtual ~indexed_list() {}
 };
 
 template<typename T> int32_t