Hi Jonathan -- thanks for the reply. Are you able to share what options you are using? I am trying this with just --enable-languages=c,c++ ( no other options ). I have also tried building with most flags from the source toolchain I am trying to replicate ( Fedora 20 ) via src rpm. I am also tried on FC24 for giggles. All attempts fail with CXXABI errors. Thanks! Matt On Wed, Nov 9, 2016 at 2:14 PM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 9 November 2016 at 19:43, Matthew Sellers wrote: >> Is this the expected result of building an older GCC release with a >> new one? > > No, I do that often. > >> Is the libstdc++ support gap too wide? > > No, I build much older versions on Fedora 23 and Fedora 24 without trouble. > > I suspect something in your environment or how you run configure is > causing the problem.