Only do shrink_to_fit() when exceptions enabled

	* include/bits/allocator.h (__shrink_to_fit_aux<T, true>::_S_do_it):
	Do nothing if exceptions are disabled.
	* include/bits/basic_string.h (basic_string::shrink_to_fit): Likewise.

From-SVN: r227870

libstdc++-v3/ChangeLog

+2015-09-17  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/allocator.h (__shrink_to_fit_aux<T, true>::_S_do_it):
+	Do nothing if exceptions are disabled.
+	* include/bits/basic_string.h (basic_string::shrink_to_fit): Likewise.
+
 2015-09-16  Jonathan Wakely  <jwakely@redhat.com>
 
 	PR libstdc++/67173

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

@@ -209,15 +209,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
       static bool
       _S_do_it(_Tp& __c) noexcept
       {
-	__try
+#if __cpp_exceptions
+	try
 	  {
 	    _Tp(__make_move_if_noexcept_iterator(__c.begin()),
 		__make_move_if_noexcept_iterator(__c.end()),
 		__c.get_allocator()).swap(__c);
 	    return true;
 	  }
-	__catch(...)
+	catch(...)
 	  { return false; }
+#else
+	return false;
+#endif
       }
     };
 #endif

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

@@ -833,13 +833,15 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       void
       shrink_to_fit() noexcept
       {
+#if __cpp_exceptions
 	if (capacity() > size())
 	  {
-	    __try
+	    try
 	      { reserve(0); }
-	    __catch(...)
+	    catch(...)
 	      { }
 	  }
+#endif
       }
 #endif
 
@@ -3282,12 +3284,14 @@ _GLIBCXX_END_NAMESPACE_CXX11
       void
       shrink_to_fit() _GLIBCXX_NOEXCEPT
       {
+#if __cpp_exceptions
 	if (capacity() > size())
 	  {
-	    __try
+	    try
 	      { reserve(0); }
-	    __catch(...)
+	    catch(...)
 	      { }
+#endif
 	  }
       }
 #endif