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c++: Fix template parm ICE [PR 98297]

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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.
This commit is contained in:
Nathan Sidwell 2020-12-16 11:49:41 -08:00
parent 3f78c8cb7f
commit 8d8bb85b48
2 changed files with 9 additions and 1 deletions
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4
gcc/cp/parser.c
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@ -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");

6
gcc/testsuite/g++.dg/template/pr98297.C Normal file
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@ -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 }