I think this is nonsense code, we seem to be naming an instantiation
of a template template parm. But this fixes the ICE. Perhaps we
should diagnose the issue earlier?
gcc/cp/
* parser.c (cp_parser_elaborated_type_specifier): Test
BOUND_TEMPLATE_TEMPLATE_PARM before checking for instantiation.
gcc/testsuite/
* g++.dg/template/pr98297.C: New.
pushing to trunk
--
Nathan Sidwell
diff --git c/gcc/cp/parser.c w/gcc/cp/parser.c
index 7ea8c28830e..3883339aa64 100644
--- c/gcc/cp/parser.c
+++ w/gcc/cp/parser.c
@@ -19650,7 +19650,9 @@ cp_parser_elaborated_type_specifier (cp_parser* parser,
if (TREE_CODE (type) == TYPENAME_TYPE)
warning (OPT_Wattributes,
"attributes ignored on uninstantiated type");
- else if (tag_type != enum_type && CLASSTYPE_TEMPLATE_INSTANTIATION (type)
+ else if (tag_type != enum_type
+ && TREE_CODE (type) != BOUND_TEMPLATE_TEMPLATE_PARM
+ && CLASSTYPE_TEMPLATE_INSTANTIATION (type)
&& ! processing_explicit_instantiation)
warning (OPT_Wattributes,
"attributes ignored on template instantiation");
diff --git c/gcc/testsuite/g++.dg/template/pr98297.C w/gcc/testsuite/g++.dg/template/pr98297.C
new file mode 100644
index 00000000000..0dd63a57b5c
--- /dev/null
+++ w/gcc/testsuite/g++.dg/template/pr98297.C
@@ -0,0 +1,6 @@
+// PR 98297, ICE
+// { dg-do compile { target c++11 } }
+template <template <class> class a>
+struct [[b]]
+a <int>; // { dg-error "does not declare anything" }
+// { dg-warning "ignored" "" { target *-*-* } .-1 }
