https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83436
--- Comment #9 from Thomas Koenig <tkoenig at gcc dot gnu.org> --- I am also seeing this. However, we have made some incompatible changes in the development phase of gcc-8. (We bumped the library version only once). This behavior could be the result of one of these changes, if the library is not in sync with the front end. I'll run a clean bootstrap and then try if the problem persists.