PR c++/44062
* c-parser.c (c_parser_expression): Mark LHS of a comma
expression as read if it is a decl, handled component or
COMPOUND_EXPR with that on the RHS.
* c-typeck.c (c_process_expr_stmt): Mark RHS of COMPOUND_EXPR
if it is a decl or handled component.
* semantics.c (finish_expr_stmt): Don't call mark_exp_read here...
* cvt.c (convert_to_void): ... but here. If expr is a COMPOUND_EXPR,
look at its second operand.
* c-c++-common/Wunused-var-7.c: New test.
* g++.dg/warn/Wunused-var-9.C: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@159286
138bc75d-0d04-0410-961f-
82ee72b054a4