https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66240
--- Comment #7 from Denis Vlasenko <vda.linux at googlemail dot com> --- Patch v8 https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00792.html https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00793.html https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00794.html https://gcc.gnu.org/ml/gcc-patches/2017-04/msg00795.html