Changes needed for MacOS X 10.4 support....

base/compat_execinfo.h

+// Copyright (c) 2006-2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+// A file you can include instead of <execinfo.h> if your project might have
+// been compiled with our SUPPORT_MACOSX_10_4 flag defined.
+// If SUPPORT_MACOSX_10_4 is not defined it just includes execinfo.h as normal,
+// otherwise it defines the symbols itself as weak linked imports, which enables
+// launching on 10.4 where they are not defined.
+
+#ifndef BASE_COMPAT_EXECINFO_H
+#define BASE_COMPAT_EXECINFO_H
+
+#ifdef SUPPORT_MACOSX_10_4
+// Manually define these here as weak imports, rather than including execinfo.h.
+// This lets us launch on 10.4 which does not have these calls.
+extern "C" {
+  extern int backtrace(void**, int) __attribute__((weak_import));
+  extern char** backtrace_symbols(void* const*, int)
+      __attribute__((weak_import));
+  extern void backtrace_symbols_fd(void* const*, int, int)
+      __attribute__((weak_import));
+}
+#else
+#include <execinfo.h>
+#endif
+
+#endif  //  BASE_COMPAT_EXECINFO_H
+