DTS7 should come with GCC7. For Changes, New Features, and Fixes, see <https://gcc.gnu.org/gcc-7/changes.html>.
GCC 7.2.1 got into DTS-7, its testing went well so far. 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/RHEA-2017:3016