Missing exception specification - Rebuild of the Debian archive with clang

"Missing exception specification" build failure(s) — clang 9.0.1

Package	Version	Supposed error message	Full log
gwama	2.2.2+dfsg-2	gammaf.cpp:65:8: error: 'gamma' is missing exception specification 'throw()'	Log
libmems	1.6.0+4725-8	../libMems/CompactGappedAlignment.h:811:6: error: 'swap, std::allocator > > > >' is missing exception specification 'noexcept(__and_, allocator > > > >, is_nothrow_move_assignable, allocator > > > > >::value)'	Log
progressivemauve	1.2.0+4713+dfsg-4	CompactGappedAlignment.h:811:6: error: 'swap, std::allocator > > > >' is missing exception specification 'noexcept(__and_, allocator > > > >, is_nothrow_move_assignable, allocator > > > > >::value)'	Log
t-coffee	12.00.7fb08c2-4	dp_lib/evaluate_dirichlet.c:543:8: error: 'lgamma_r' is missing exception specification 'throw()'	Log

4 errors