https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108266
--- Comment #2 from CVS Commits ---
The master branch has been updated by Jakub Jelinek :
https://gcc.gnu.org/g:01ea66a6c56e53163d9430f4d87615d570848aa8
commit r13-5075-g01ea66a6c56e53163d9430f4d87615d570848aa8
Author: Jakub Jelinek
Date: Mon Jan 9 23:41:20 2023 +0100
c++: Only do maybe_init_list_as_range optimization if
!processing_template_decl [PR108047]
The last testcase in this patch ICEs, because
maybe_init_list_as_range -> maybe_init_list_as_array
calls maybe_constant_init in:
/* Don't do this if the conversion would be constant. */
first = maybe_constant_init (first);
if (TREE_CONSTANT (first))
return NULL_TREE;
but maybe_constant_init shouldn't be called when processing_template_decl.
While we could replace that call with fold_non_dependent_init, my limited
understanding is that this is an optimization and even if we don't optimize
it when processing_template_decl, build_user_type_conversion_1 will be
called again during instantiation with !processing_template_decl if it is
every instantiated and we can do the optimization only then.
2023-01-09 Jakub Jelinek
PR c++/105838
PR c++/108047
PR c++/108266
* call.cc (maybe_init_list_as_range): Always return NULL_TREE if
processing_template_decl.
* g++.dg/tree-ssa/initlist-opt2.C: New test.
* g++.dg/tree-ssa/initlist-opt3.C: New test.
