On Wed, Jan 23, 2019 at 12:57 PM Marek Polacek <pola...@redhat.com> wrote: > > On Wed, Jan 23, 2019 at 09:00:36AM -0500, Jason Merrill wrote: > > I was talking about digest_init, not reshape_init. digest_init calls > > convert_for_initialization. > > /facepalm > > So yes, digest_init calls convert_for_initialization which will end up > calling perform_implicit_conversion_flags which could call convert_like_real > where the narrowing warnings are given, but it doesn't, we go to this case: > > else if (processing_template_decl && conv->kind != ck_identity) > { > /* In a template, we are only concerned about determining the > type of non-dependent expressions, so we do not have to > perform the actual conversion. But for initializers, we > need to be able to perform it at instantiation > (or instantiate_non_dependent_expr) time. */ > expr = build1 (IMPLICIT_CONV_EXPR, type, expr); > > finish_decltype_type throws away the expression because it's not dependent, > and > only uses its type. So narrowing remains undetected. Not sure if I should > mess > with perform_implicit_conversion_flags.
Let's try that; this is a situation where the comment is incorrect. Perhaps just call check_narrowing here if appropriate, rather than go through the whole conversion machinery. Jason