https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78314
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2016-11-11 Ever confirmed|0 |1 --- Comment #2 from Richard Earnshaw <rearnsha at gcc dot gnu.org> --- current code has int support_fpu_trap (int flag) { return support_fpu_flag (flag); } In other words, it assumes that if there is a flag for noting that an exception has occurred, then it is also possible to trap on that flag being changed. That's not a valid assumption for AArch64.