Hello, When the shared library for CLN is built with link-time optimization [1] (LTO) enabled, linking against libcln.so fails (for example GiNaC fails to build). Turning off link-time optimization fixes the linking issue, but I wonder if this is a bug in CLN that needs fixing or a compiler issue and if we can build and use LTO enabled CLN in the future. This issue was first reported [2] against openSUSE Tumbleweed which builds its packages with LTO flags by default; we are currently in the process of working around this by disabling the LTO flags specifically for CLN [3]. Thanks in advance for any suggestion as to how to fix TLO-enabled CLN builds or if indeed disabling LTO is the only way to go (at least for now). I maintain openSUSE's CLN and GiNaC packages. Cheers, [1] https://gcc.gnu.org/wiki/LinkTimeOptimization [2] https://bugzilla.opensuse.org/show_bug.cgi?id=1176710 [3] https://build.opensuse.org/request/show/835441 -- Atri Bhattacharya