DTS 8.1 gcc should be updated from the latest Fedora GCC. Also add missing includes while at it.
Currently, devtoolset-8-gcc-8.3.1-3.el{6,7} is in composes. The testing looks good for this version. VERIFIED.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:1446