Bug#996553: ptl: autopkgtest failure on armhf

[Adrian Bunk]

Source: ptl
Version: 2.0.0-1
Severity: serious

https://ci.debian.net/data/autopkgtest/testing/armhf/p/ptl/15952694/log.gz

...
In file included from /usr/include/c++/10/map:61,
                 from /usr/include/PTL/Utility.hh:30,
                 from /usr/include/PTL/Globals.hh:36,
                 from /usr/include/PTL/Threading.hh:28,
                 from /usr/include/PTL/AutoLock.hh:246,
                 from /usr/include/PTL/PTL.hh:22,
                 from /tmp/autopkgtest-lxc.75pc7umd/downtmp/autopkgtest_tmp/minimal/minimal.cc:22:
/usr/include/c++/10/bits/stl_map.h: In member function ‘std::map<_Key, _Tp, _Compare, _Alloc>::mapped_type& std::map<_Key, _Tp, _Compare, _Alloc>::operator[](const key_type&) [with _Key = std::thread::id; _Tp = long long unsigned int; _Compare = std::less<std::thread::id>; _Alloc = std::allocator<std::pair<const std::thread::id, long long unsigned int> >]’:
/usr/include/c++/10/bits/stl_map.h:501:37: note: parameter passing for argument of type ‘std::_Rb_tree<std::thread::id, std::pair<const std::thread::id, long long unsigned int>, std::_Select1st<std::pair<const std::thread::id, long long unsigned int> >, std::less<std::thread::id>, std::allocator<std::pair<const std::thread::id, long long unsigned int> > >::const_iterator’ changed in GCC 7.1
...
autopkgtest [09:22:50]: @@@@@@@@@@@@@@@@@@@@ summary
examples.sh          FAIL stderr: In file included from /usr/include/c++/10/map:61,