[Bug c++/66971] thread_local with external linkage and constructor cannot be compiled correctly

[ahu at ds9a dot nl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66971

bert hubert <ahu at ds9a dot nl> changed:

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                 CC|                            |ahu at ds9a dot nl

--- Comment #1 from bert hubert <ahu at ds9a dot nl> ---
I can confirm this issue on the stock Ubuntu Xenial g++ which describes itself
as gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 

In addition, PowerDNS recursor from git has run into this problem too. 

This workaround helps:
https://github.com/PowerDNS/pdns/pull/5350/commits/f165a1f4fc8ebd9b7ca060e4a332a687c4d46510

Other versions of g++ do not show this problem. I have not yet verified if this
bug shows in g++ 5.4.0 without Ubuntu patches.