On Thu, 17 Oct 2024, Florian Weimer wrote: > > I'm not sure such a warning particularly helps, however; any ABI > > incompatibility occurs at the point where someone changes their code to > > stop defining bool and to use the standard bool instead. (And any problem > > code would already have been ABI-incompatible with C++.) > > The warning might encourage developers to plan for the transition and > think about the ABI impact. I think we should try to bring across the > message that this isn't just about fixing build failures.
Certainly there should be porting instructions much like those in gcc-14/porting_to.html (and those could discuss ABI considerations around changing bool definitions where a library is involved, in more detail than could go in a warning). And it's possible that mass builds with comparison of configure test results would help detect any cases where those get perturbed by a change to -std=gnu23 as default, similar to the previous C modernization changes. -- Joseph S. Myers josmy...@redhat.com
