shared_ptr.h: Add include guards.

2009-03-11  Jonathan Wakely  <jwakely.gcc@gmail.com>

	* include/bits/shared_ptr.h: Add include guards.
	* include/tr1/shared_ptr.h: Likewise.

From-SVN: r144778

libstdc++-v3/ChangeLog

 2009-03-11  Jonathan Wakely  <jwakely.gcc@gmail.com>
 
+	* include/bits/shared_ptr.h: Add include guards.
+	* include/tr1/shared_ptr.h: Likewise.
+
+2009-03-11  Jonathan Wakely  <jwakely.gcc@gmail.com>
+
 	* include/std/iostream: Fix doxygen link.
 	* include/bits/forward_list.h: Fix doxygen markup.
 	* include/ext/vstring.h: Escape backslash in doxygen comment.

libstdc++-v3/include/bits/shared_ptr.h

@@ -51,6 +51,9 @@
  *  You should not attempt to use it directly.
  */
 
+#ifndef _SHARED_PTR_H
+#define _SHARED_PTR_H 1
+
 #ifndef __GXX_EXPERIMENTAL_CXX0X__
 # include <c++0x_warning.h>
 #endif
@@ -1589,3 +1592,5 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
   // @} group pointer_abstractions
 
 _GLIBCXX_END_NAMESPACE
+
+#endif // _SHARED_PTR_H

libstdc++-v3/include/tr1/shared_ptr.h

@@ -51,6 +51,9 @@
  *  You should not attempt to use it directly.
  */
 
+#ifndef _TR1_SHARED_PTR_H
+#define _TR1_SHARED_PTR_H 1
+
 #if defined(_GLIBCXX_INCLUDE_AS_CXX0X)
 #  error TR1 header cannot be included from C++0x header
 #endif
@@ -1018,3 +1021,5 @@ namespace tr1
 
 }
 }
+
+#endif // _TR1_SHARED_PTR_H