On Sat Aug 31, 2024 at 09:57:56PM GMT, Mihai Popescu wrote:
> > +CPPFLAGS+= -D_LIBCXXABI_FORGIVING_DYNAMIC_CAST
> 
> Got curious why OpenBSD platform needs some modifications for most of
> the things in C/C++.

What else, for example? How many “platform” do you know use LLVM for
base and packages?


> And found this [1], with a copious explanation as a comment, then the
> code implementation.

"found" aka first google entry ^^

> I don't understant it but I am happy I don't have to work in this high
> programming language.
> Sorry for hijacking the thread.
> 
> Out of curiosity again, is anyone among the OpenBSD devs who can fully
> understand this?
> 
> [1] https://github.com/llvm-mirror/libcxxabi/blob/master/src/private_typeinfo.cpp
> 

"Make dynamic_cast more forgiving when type_info's mistakenly have hidden
visibility, and thus multiple type_infos can exist for a single type."

IMO this is the case for KiCad.


"When the dynamic_cast would normally fail, this option will cause the
library to try comparing the type_info names to see if they are equal
instead"

...and here is a description of why it works for us.