https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83547
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Author: jakub Date: Fri Dec 22 18:01:58 2017 New Revision: 255980 URL: https://gcc.gnu.org/viewcvs?rev=255980&root=gcc&view=rev Log: PR debug/83547 * tree-iterator.c (alloc_stmt_list): Start with cleared TREE_SIDE_EFFECTS regardless whether a new STATEMENT_LIST is allocated or old one reused. c/ * c-typeck.c (c_finish_stmt_expr): Ignore !TREE_SIDE_EFFECTS as indicator of ({ }), instead skip all trailing DEBUG_BEGIN_STMTs first, and consider empty ones if there are no other stmts. For -Wunused-value walk all statements before the one only followed by DEBUG_BEGIN_STMTs. testsuite/ * gcc.c-torture/compile/pr83547.c: New test. Added: trunk/gcc/testsuite/gcc.c-torture/compile/pr83547.c Modified: trunk/gcc/ChangeLog trunk/gcc/c/ChangeLog trunk/gcc/c/c-typeck.c trunk/gcc/testsuite/ChangeLog trunk/gcc/tree-iterator.c
