gcc-toolset-9-gcc should buildrequire binutils >= 2.31. This is to ensure that [Bug 1633721] dlopen reports undefined symbol with RTLD_LAZY flag on ppc64le is fixed. We did the same thing for DTS 9.
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-2019:3440