https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896
--- Comment #29 from Martin Uecker <muecker at gwdg dot de> --- Am Mittwoch, dem 08.03.2023 um 17:13 +0000 schrieb qinzhao at gcc dot gnu.org: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108896 > > --- Comment #24 from qinzhao at gcc dot gnu.org --- > (In reply to Martin Uecker from comment #15) > > ... > > however, I think that both the new attribute and the new C syntax extension > should support the similar user interface. We might need to decide on this > first. I think there are some fundamental differences: In one case the size is encoded into the type and in the other it is just an annotation that can be ignored. > > right now, the user interface we cannot agreed on is: > > whether we should support the following nested annotation (either with > attribute or with the C syntax extension): > > struct object { > ... > unsigned int items; > ... > struct inner { > ... > int flex[]; > }; > } *ptr; > > > My opinion is: No, we should not support this, it will make the implementation > much more complicated both for attribute and for C syntax extension. > > But I am not very sure on this yet. I am fine with supporting it, but one needs to decide on the semantics in the case where inner is not accessed via the outer struct. > > Is the PLACEHOLDER_EXPR able to resolve this? I don't know yet. Martin >
