https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82410
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Author: jakub Date: Fri Mar 16 12:46:12 2018 New Revision: 258593 URL: https://gcc.gnu.org/viewcvs?rev=258593&root=gcc&view=rev Log: PR c++/79937 PR c++/82410 * tree.h (TARGET_EXPR_NO_ELIDE): Define. * gimplify.c (gimplify_modify_expr_rhs): Don't elide TARGET_EXPRs with TARGET_EXPR_NO_ELIDE flag set unless *expr_p is INIT_EXPR. * cp-tree.h (CONSTRUCTOR_PLACEHOLDER_BOUNDARY): Define. (find_placeholder): Declare. * tree.c (struct replace_placeholders_t): Add exp member. (replace_placeholders_r): Don't walk into ctors with CONSTRUCTOR_PLACEHOLDER_BOUNDARY flag set, unless they are equal to d->exp. Replace PLACEHOLDER_EXPR with unshare_expr (x) rather than x. (replace_placeholders): Initialize data.exp. (find_placeholders_r, find_placeholders): New functions. * typeck2.c (process_init_constructor_record, process_init_constructor_union): Set CONSTRUCTOR_PLACEHOLDER_BOUNDARY if adding NSDMI on which find_placeholder returns true. * call.c (build_over_call): Don't call replace_placeholders here. * cp-gimplify.c (cp_genericize_r): Set TARGET_EXPR_NO_ELIDE on TARGET_EXPRs with CONSTRUCTOR_PLACEHOLDER_BOUNDARY set on TARGET_EXPR_INITIAL. (cp_fold): Copy over CONSTRUCTOR_PLACEHOLDER_BOUNDARY bit to new ctor. * g++.dg/cpp1y/pr79937-1.C: New test. * g++.dg/cpp1y/pr79937-2.C: New test. * g++.dg/cpp1y/pr79937-3.C: New test. * g++.dg/cpp1y/pr79937-4.C: New test. * g++.dg/cpp1y/pr82410.C: New test. Added: trunk/gcc/testsuite/g++.dg/cpp1y/pr79937-1.C trunk/gcc/testsuite/g++.dg/cpp1y/pr79937-2.C trunk/gcc/testsuite/g++.dg/cpp1y/pr79937-3.C trunk/gcc/testsuite/g++.dg/cpp1y/pr79937-4.C trunk/gcc/testsuite/g++.dg/cpp1y/pr82410.C Modified: trunk/gcc/ChangeLog trunk/gcc/cp/ChangeLog trunk/gcc/cp/call.c trunk/gcc/cp/cp-gimplify.c trunk/gcc/cp/cp-tree.h trunk/gcc/cp/tree.c trunk/gcc/cp/typeck2.c trunk/gcc/gimplify.c trunk/gcc/testsuite/ChangeLog trunk/gcc/tree.h
