Hi,
this ICE on invalid happens only in c++17 mode, when
redeclaration_error_message performs an additional check which only
makes sense for data members. Thus the fix is easy: avoid checking
DECL_DECLARED_CONSTEXPR_P on CONST_DECLs.
Tested x86_64-linux.
Thanks, Paolo.
//////////////////////
/cp
2018-02-26 Paolo Carlini <paolo.carl...@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.carl...@oracle.com>
PR c++/84533
* g++.dg/cpp1z/pr84533.C: New.
Index: cp/decl.c
===================================================================
--- cp/decl.c (revision 257983)
+++ cp/decl.c (working copy)
@@ -2919,6 +2919,7 @@ redeclaration_error_message (tree newdecl, tree ol
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))
Index: testsuite/g++.dg/cpp1z/pr84533.C
===================================================================
--- testsuite/g++.dg/cpp1z/pr84533.C (nonexistent)
+++ testsuite/g++.dg/cpp1z/pr84533.C (working copy)
@@ -0,0 +1,3 @@
+// { dg-options "-std=c++17" }
+
+enum E { e, e }; // { dg-error "redefinition" }
