Hello, Since the introduction of the _auto_ destructor macros, ell and iwd generate nested functions, which are a gnu extension not supported by clang. While adding support for that in clang would also benefit other projects, I don't think this idea is going anywhere as it has been brought up numerous times in the past and never went forward. The way e.g. glib deals with it is by splitting this in two, first define the destructor function alonside the struct it is going to destruct, then hook it up with a macro like _auto_ here, this way no nested functions are needed. Would this make sense for ell/iwd too? I can provide patches if required.