Add INCLUDE_UNIQUE_PTR and use it (PR bootstrap/82610)

gcc/ChangeLog:
	PR bootstrap/82610
	* system.h: Conditionally include "unique-ptr.h" if
	INCLUDE_UNIQUE_PTR is defined.
	* unique-ptr-tests.cc: Remove include of "unique-ptr.h" in favor
	of defining INCLUDE_UNIQUE_PTR before including "system.h".

include/ChangeLog:
	* unique-ptr.h: Make include of <memory> conditional on C++11 or
	later.

From-SVN: r254024

gcc/ChangeLog

+2017-10-23  David Malcolm  <dmalcolm@redhat.com>
+
+	PR bootstrap/82610
+	* system.h: Conditionally include "unique-ptr.h" if
+	INCLUDE_UNIQUE_PTR is defined.
+	* unique-ptr-tests.cc: Remove include of "unique-ptr.h" in favor
+	of defining INCLUDE_UNIQUE_PTR before including "system.h".
+
 2017-10-23  Sebastian Perta  <sebastian.perta@renesas.com>
 
 	* config/rl78/rl78.md: New define_expand "subdi3".

gcc/system.h

@@ -720,6 +720,16 @@ extern int vsnprintf (char *, size_t, const char *, va_list);
 #define __builtin_expect(a, b) (a)
 #endif
 
+/* Some of the headers included by <memory> can use "abort" within a
+   namespace, e.g. "_VSTD::abort();", which fails after we use the
+   preprocessor to redefine "abort" as "fancy_abort" below.
+   Given that unique-ptr.h can use "free", we need to do this after "free"
+   is declared but before "abort" is overridden.  */
+
+#ifdef INCLUDE_UNIQUE_PTR
+# include "unique-ptr.h"
+#endif
+
 /* Redefine abort to report an internal error w/o coredump, and
    reporting the location of the error in the source file.  */
 extern void fancy_abort (const char *, int, const char *)

gcc/unique-ptr-tests.cc

@@ -18,9 +18,9 @@ along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
 #include "config.h"
+#define INCLUDE_UNIQUE_PTR
 #include "system.h"
 #include "coretypes.h"
-#include "unique-ptr.h"
 #include "selftest.h"
 
 #if CHECKING_P

include/ChangeLog

+2017-10-23  David Malcolm  <dmalcolm@redhat.com>
+
+	* unique-ptr.h: Make include of <memory> conditional on C++11 or
+	later.
+
 2017-10-16  Trevor Saunders  <tbsaunde+gcc@tbsaunde.org>
 	    David Malcolm  <dmalcolm@redhat.com>
 

include/unique-ptr.h

@@ -74,7 +74,9 @@
 #ifndef GNU_UNIQUE_PTR_H
 #define GNU_UNIQUE_PTR_H 1
 
-#include <memory>
+#if __cplusplus >= 201103
+# include <memory>
+#endif
 
 namespace gnu
 {