Found a workaround http://code.google.com/p/perl-compiler/issues/detail?id=77 I added a XSLoader::load_file function with a sane API in r1190, which does not use caller() and its new problem with using HEK instead of the stashname PV. We have no caller info since we freeze/thaw the state after BEGIN, when the bootstrap call was already made, and we have no caller information for this call. We successfully faked it until 5.15.3 in dl_init(), now we use our private XSLoader::load_file() -- Reini UrbanThread Previous