https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122879
--- Comment #4 from Joseph S. Myers <jsm28 at gcc dot gnu.org> --- Annex G explicitly says signaling NaN behavior is implementation-defined for <complex.h> functions (there's no defined equivalent of the Annex F FE_SNANS_ALWAYS_SIGNAL). It doesn't say so for complex arithmetic operations, but it probably ought to.
