https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110592
--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- Sorry, no, NetBSD/sparc is too obscure a platform to justify changing the default for the entire compiler. But you can do like Linux & Solaris and add sparc/tso.h to the tm_file list of sparc-*-netbsdelf*) in config.gcc.