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c++: Handle bad pack expansion in base list. [PR96752]

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This fixes PR95672 by adding the missing TYPE_PACK_EXPANSION case in
cxx_incomplete_type_diagnostic in order to avoid ICEs on diagnosing
incomplete template pack expansion cases.

Tested on powerpc64le-unknown-linux-gnu.

gcc/cp/ChangeLog:

	PR c++/95672
	* typeck2.c (cxx_incomplete_type_diagnostic): Add missing
	TYPE_EXPANSION_PACK check for diagnosing incomplete types in
	cxx_incomplete_type_diagnostic.

gcc/testsuite/ChangeLog:

	PR c++/95672
	* g++.dg/template/pr95672.C: New test.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
This commit is contained in:
Nicholas Krause 2020-06-23 15:47:37 -04:00 committed by Jason Merrill
parent 1e5da6a02f
commit 11a751ff77
2 changed files with 8 additions and 0 deletions
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5
gcc/cp/typeck2.c
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@ -552,6 +552,11 @@ cxx_incomplete_type_diagnostic (location_t loc, const_tree value,
TYPE_NAME (type));
break;
case TYPE_PACK_EXPANSION:
emit_diagnostic (diag_kind, loc, 0,
"invalid use of pack expansion %qT", type);
break;
case TYPENAME_TYPE:
case DECLTYPE_TYPE:
emit_diagnostic (diag_kind, loc, 0,

3
gcc/testsuite/g++.dg/template/pr95672.C Normal file
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@ -0,0 +1,3 @@
// PR c++/95672
// { dg-do compile { target c++14 } }
struct g_class : decltype (auto) ... { }; // { dg-error "invalid use of pack expansion" }