re PR c++/84533 (ICE with duplicate enum value)

/cp
2018-02-26  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84533
	* decl.c (redeclaration_error_message): Don't try to use
	DECL_DECLARED_CONSTEXPR_P on CONST_DECLs.

/testsuite
2018-02-26  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/84533
	* g++.dg/cpp1z/pr84533.C: New.

From-SVN: r257991

gcc/cp/ChangeLog

 2018-02-26  Paolo Carlini  <paolo.carlini@oracle.com>
 
+	PR c++/84533
+	* decl.c (redeclaration_error_message): Don't try to use
+	DECL_DECLARED_CONSTEXPR_P on CONST_DECLs.
+
+2018-02-26  Paolo Carlini  <paolo.carlini@oracle.com>
+
 	* lambda.c (build_capture_proxy): Define static.
 	* cp-tree.h (build_capture_proxy): Remove.
 

gcc/cp/decl.c

@@ -2919,6 +2919,7 @@ redeclaration_error_message (tree newdecl, tree olddecl)
 	 specifier is declaration rather than definition (and
 	 deprecated).  */
       if (cxx_dialect >= cxx17
+	  && VAR_P (olddecl)
 	  && DECL_CLASS_SCOPE_P (olddecl)
 	  && DECL_DECLARED_CONSTEXPR_P (olddecl)
 	  && !DECL_INITIAL (newdecl))

gcc/testsuite/ChangeLog

+2018-02-26  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/84533
+	* g++.dg/cpp1z/pr84533.C: New.
+
 2018-02-26  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/84537

gcc/testsuite/g++.dg/cpp1z/pr84533.C

+// { dg-options "-std=c++17" }
+
+enum E { e, e };  // { dg-error "redefinition" }