https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119296
--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> --- r15-9183-gb6aafe9a5b1452f3 has replacements for strfromf32/64. Support for f128 on targets which can support __float128 can be provided by libquadmath which has conversion functions).