Changelog for libstdc++5-3.3.6-18.mga8.x86_64.rpm :

* Sat Oct 24 2020 pterjan 3.3.6-18.mga8+ Revision: 1639136- Fix build with bison 3.7
* Fri Feb 14 2020 umeabot 3.3.6-17.mga8+ Revision: 1519411- Mageia 8 Mass Rebuild