Changelog for libcxx-devel-3.9.0-4.fc26.i686.rpm :

* Fri Mar 03 2017 Tom Callaway - 3.9.0-4- LIBCXX_ENABLE_ABI_LINKER_SCRIPT=ON
* Wed Mar 01 2017 Tom Callaway - 3.9.0-3- disable bootstrap
* Tue Feb 21 2017 Dan Horák - 3.9.0-2- apply s390(x) workaround only in Fedora < 26
* Mon Feb 20 2017 Tom Callaway - 3.9.0-1- update to 3.9.0 (match clang)
* Fri Feb 10 2017 Fedora Release Engineering - 3.8.1-2- Rebuilt for https://fedoraproject.org/wiki/Fedora_26_Mass_Rebuild
* Fri Aug 26 2016 Tom Callaway - 3.8.1-1- update to 3.8.1
* Thu Jun 09 2016 Dan Horák - 3.8.0-4- exclude Power only in EPEL- default to z10 on s390(x)
* Thu May 19 2016 Tom Callaway - 3.8.0-3- use gcc on el7, fedora < 24. use clang on el6 and f24+ MAGIC.- bootstrap on
* Tue May 03 2016 Tom Callaway - 3.8.0-2- bootstrap off
* Tue May 03 2016 Tom Callaway - 3.8.0-1- initial package- bootstrap on