https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63510
--- Comment #9 from Chen Gang <gang.chen.5i5j at gmail dot com> --- We need call warning_at() instead of warnings() in fold_overflow_warning() in gcc/fold-const.c. The related location parameter of warning_at() should be calculated, just like another gcc files has done: e.g. gcc/c-family/*.c which use warning_at(). I shall continue to analyze how to calculate the location in gcc/fold-const.c, reference from the other files. Thanks.
