https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106902
--- Comment #36 from Alexander Monakov <amonakov at gcc dot gnu.org> --- We can flip the default from =fast to =on for -std=gnuXX any time we like, but it must remain at =off for =std=cXX as long as STDC FP_CONTRACT pragma is not implemented. I have not attempted any mass rebuild-test cycles with the changed default.
