The buildbot for both i686 and x86_64 uses: gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04) and the build current fails with: ../sysdeps/ieee754/ldbl-96/k_tanl.c:139:10: error: 'sign' may be used uninitialized in this function [-Werror=maybe-uninitialized]