https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104213
--- Comment #10 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I did but it didn't work either. So I think we need to properly propagate the
suppression bits. Something like this:
diff --git a/gcc/gimplify.cc b/gcc/gimplify.cc
index bf2f60cce9a..0d266241b8c 100644
--- a/gcc/gimplify.cc
+++ b/gcc/gimplify.cc
@@ -6126,6 +6126,7 @@ gimplify_modify_expr (tree *expr_p, gimple_seq *pre_p,
gimple_seq *post_p,
else
{
assign = gimple_build_assign (*to_p, *from_p);
+ copy_warning (assign, *expr_p);
gimple_set_location (assign, EXPR_LOCATION (*expr_p));
if (COMPARISON_CLASS_P (*from_p))
copy_warning (assign, *from_p);
which, along with the patch above, works.
