Any concerns, particularly with respect to how the app determines if the feature is available? I think it would be fine to make the feature always available but to simply note that on some platforms the application-specified error function would never be called.
Sure. I'm not of the type that thinks that everything must work identically on all platforms. =)
Note, I don't think this patch would compile when APR_HAS_CHILD_ERRFN is 0. The apr_child_errfn_t wouldn't be defined, but it'd be references in apr_arch_threadproc.h. Not that I'm aware of any Unix platforms without fork(), but... -- justin
