2009-07-08  Manuel López-Ibáñez  <manu@gcc.gnu.org>

	PR c++/31246
	* gimplify.c (gimplify_expr): Propagate no_warning flag when
	gimplifying.
	* gimple (gimple_build_call_from_tree): Likewise.
	* tree-cfg.c (remove_useless_stmts_warn_notreached): Check
	no_warning flag before warning.
cp/
	* init.c (build_new_1): Set TREE_NO_WARNING for compiler-generated
	code.
	* cp-gimplify.c (genericize_eh_spec_block): Likewise.
	
testsuite/	
	* g++.dg/warn/pr31246.C: New.
	* g++.dg/warn/pr31246-2.C: New.

From-SVN: r149354