https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109818
--- Comment #29 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to Janez Zemva from comment #27) > forcing glibcxx_cv_c99_math_tr1=yes solved this issue for me. The C99 > compliance test is really strict, even openlibm fails the test (it fails to > define float_t and double_t, but this can be hacked around). It's precisely as strict as it needs to be: it checks that every name that will be subject to a using-declaration is present. Because otherwise compiling <cmath> will give errors. But supporting openlibm would be nice, so I'll separate the checks for those typedefs.
