r255980 - in /trunk/gcc: ChangeLog c/ChangeLog ...

[jakub@gcc.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