[CLN-list] Linking against cln fails when built with link-time-optimization

[Atri Bhattacharya]

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