https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88580
--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>: https://gcc.gnu.org/g:37d2b98100cefcb9d312d379473c12aa6d61fc62 commit r12-174-g37d2b98100cefcb9d312d379473c12aa6d61fc62 Author: Patrick Palka <ppa...@redhat.com> Date: Tue Apr 27 14:18:25 2021 -0400 c++: Fix Bases(args...)... base initialization [PR88580] When substituting into the arguments of a base initializer pack expansion, tsubst_initializer_list uses a dummy EXPR_PACK_EXPANSION in order to expand an initializer such as Bases(args)... into Bases#{0}(args#{0}) and so on. But when an argument inside the base initializer is itself a pack expansion, as in Bases(args...)..., the argument is already an EXPR_PACK_EXPANSION so we don't need to wrap it. It's also independent from the outer expansion of Bases, so we need to "multiplicatively" append the expansion of args... onto the argument list of each expanded base. gcc/cp/ChangeLog: PR c++/88580 * pt.c (tsubst_initializer_list): Correctly handle the case where an argument inside a base initializer pack expansion is itself a pack expansion. gcc/testsuite/ChangeLog: PR c++/88580 * g++.dg/cpp0x/variadic182.C: New test.
