Require C11 for C++17 on Solaris

	* config/sol2.h (TARGET_OS_CPP_BUILTINS): Define __STDC_VERSION__
	to 201112L since C++17.

From-SVN: r244430

gcc/ChangeLog

+2017-01-13  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* config/sol2.h (TARGET_OS_CPP_BUILTINS): Define __STDC_VERSION__
+	to 201112L since C++17.
+
 2017-01-13  Maxim Ostapenko  <m.ostapenko@samsung.com>
 
 	PR sanitizer/78887

gcc/config/sol2.h

@@ -82,26 +82,41 @@ along with GCC; see the file COPYING3.  If not see
 /* Names to predefine in the preprocessor for this target machine.  */
 #define TARGET_SUB_OS_CPP_BUILTINS()
 #define TARGET_OS_CPP_BUILTINS()			\
-    do {						\
-	builtin_define_std ("unix");			\
-	builtin_define_std ("sun");			\
-	builtin_define ("__svr4__");			\
-	builtin_define ("__SVR4");			\
-	builtin_assert ("system=unix");			\
-	builtin_assert ("system=svr4");			\
-	/* For C++ we need to add some additional macro	\
-	   definitions required by the C++ standard	\
-	   library.  */					\
-	if (c_dialect_cxx ())				\
+  do {							\
+    builtin_define_std ("unix");			\
+    builtin_define_std ("sun");				\
+    builtin_define ("__svr4__");			\
+    builtin_define ("__SVR4");				\
+    builtin_assert ("system=unix");			\
+    builtin_assert ("system=svr4");			\
+    /* For C++ we need to add some additional macro	\
+       definitions required by the C++ standard		\
+       library.  */					\
+    if (c_dialect_cxx ())				\
+      {							\
+	switch (cxx_dialect)				\
 	  {						\
+	  case cxx98:					\
+	  case cxx11:					\
+	  case cxx14:					\
+	    /* C++11 and C++14 are based on C99.	\
+	       libstdc++ makes use of C99 features	\
+	       even for C++98.  */			\
 	    builtin_define ("__STDC_VERSION__=199901L");\
-	    builtin_define ("_XOPEN_SOURCE=600");	\
-	    builtin_define ("_LARGEFILE_SOURCE=1");	\
-	    builtin_define ("_LARGEFILE64_SOURCE=1");	\
-	    builtin_define ("__EXTENSIONS__");		\
+	    break;					\
+							\
+	  default:					\
+	    /* C++17 is based on C11.  */		\
+	    builtin_define ("__STDC_VERSION__=201112L");\
+	    break;					\
 	  }						\
-	TARGET_SUB_OS_CPP_BUILTINS();			\
-    } while (0)
+	builtin_define ("_XOPEN_SOURCE=600");		\
+	builtin_define ("_LARGEFILE_SOURCE=1");		\
+	builtin_define ("_LARGEFILE64_SOURCE=1");	\
+	builtin_define ("__EXTENSIONS__");		\
+      }							\
+    TARGET_SUB_OS_CPP_BUILTINS();			\
+  } while (0)
 
 #define SUBTARGET_OVERRIDE_OPTIONS			\
   do {							\