As of this writing (but perhaps not for very much longer!) the four mainstream compilers on Godbolt Compiler Explorer give four different answers for this simple C++ program:
M. Rigger, S. Marr, B. Adams, and H. Mössenböck. Proceedings of the 2019 27th ACM Joint Meeting on European Software Engineering Conference and Symposium on the Foundations of Software Engineering, ACM, (August 2019)
T. Zhou, M. Jantz, P. Kulkarni, K. Doshi, and V. Sarkar. Proceedings of the 28th International Conference on Compiler Construction, page 147--158. New York, NY, USA, ACM, (2019)
G. Chari, D. Garbervetsky, and S. Marr. Proceedings of the 11th Workshop on Implementation, Compilation, Optimization of Object-Oriented Languages, Programs and Systems, page 5. (Jun 19, 2017)
S. Ryu, and N. Ramsey. Compiler Construction: 14th International Conference, CC 2005, Held as Part of the Joint European Conferences on Theory and Practice of Software, ETAPS 2005, Edinburgh, UK, April 4-8, 2005. Proceedings, page 10--26. Springer, (2005)
V. Ureche, C. Talau, and M. Odersky. Proceedings of the 2013 ACM SIGPLAN International Conference on Object Oriented Programming Systems Languages &\#38; Applications, page 73--92. ACM, (2013)
H. Santos, P. Alves, I. Costa, and F. Quintao Pereira. Proceedings of the 2013 IEEE/ACM International Symposium on Code Generation and Optimization (CGO), page 1--11. IEEE Computer Society, (2013)
M. Chevalier-Boisvert, and M. Feeley. 30th European Conference on Object-Oriented Programming (ECOOP 2016), volume 56 of Leibniz International Proceedings in Informatics (LIPIcs), page 7:1--7:24. Dagstuhl, Germany, Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik, (2016)
S. Marr, and S. Ducasse. Proceedings of the 2015 ACM International Conference on Object Oriented Programming Systems Languages & Applications, page 821--839. ACM, (October 2015)(acceptance rate 25%).
C. Häubl, C. Wimmer, and H. Mössenböck. Computer Languages, Systems & Structures, 39 (4):
123 - 141(2013)Special issue on the Programming Languages track at the 27th \ACM\ Symposium on Applied Computing.
R. Krishnaiyer, E. Kultursay, P. Chawla, S. Preis, A. Zvezdin, and H. Saito. Proceedings of the 2013 IEEE 27th International Symposium on
Parallel and Distributed Processing Workshops and PhD Forum, page 1575--1586. Washington, DC, USA, IEEE Computer Society, (2013)
Y. Park, S. Seo, H. Park, H. Cho, and S. Mahlke. Proceedings of the seventeenth international conference on
Architectural Support for Programming Languages and Operating
Systems, 40, page 363--374. ACM, (2012)
M. Golm, and J. Kleinöder. Meta-Level Architectures and Reflection, volume 1616 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (1999)
M. Golm, and J. Kleinöder. Meta-Level Architectures and Reflection, volume 1616 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (1999)