https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69462
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2016-01-25 Ever confirmed|0 |1 --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- gcc/ginclude/float.h only defines them for: #if defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L That test should be: #if (defined (__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) \ || (defined (__cplusplus) && __cplusplus >= 201103L)