https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69133
--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> --- The problem seems to be that cgraph_node::get_untransformed_body checks presence of body by DECL_RESULT which is NULL for thunks. Rest of places seems to check for DECL_ARGUMENTS. I am testing: Index: cgraph.c =================================================================== --- cgraph.c (revision 232466) +++ cgraph.c (working copy) @@ -3305,10 +3295,11 @@ cgraph_node::get_untransformed_body (voi size_t len; tree decl = this->decl; - if (DECL_RESULT (decl)) + /* Check if body is already there. */ + if (!DECL_ARGUMENTS (decl)) return false; - gcc_assert (in_lto_p); + gcc_assert (in_lto_p && !DECL_RESULT (decl)) timevar_push (TV_IPA_LTO_GIMPLE_IN);