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I found that I got more information on the core-dump if I omitted the last command-line argument, the name of the output file.  I'm not sure whether that changes the error but I attach a copy and paste in case it's helpful.   It's not exactly reproducible though; it always ends in 'Aborted (core dumped)' but what's before that varies.  The tail from one run is:

7f92ea455000-7f92ea459000 r--p 000c2000 00:2e 55031659                   /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_regex.so.1.71.0
7f92ea459000-7f92ea45b000 rw-p 000c6000 00:2e 55031659                   /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_regex.so.1.71.0
7f92ea45b000-7f92ea45c000 r-xp 00000000 00:2e 55031663                   /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_system.so.1.71.0
7f92ea45c000-7f92ea65b000 ---p 00001000 00:2e 55031663                   /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_system.so.1.71.0
7f92ea65b000-7f92ea65c000 r--p 00000000 00:2e 55031663                   /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_system.so.1.71.0
7f92ea65c000-7f92ea65d000 rw-p 00001000 00:2e 55031663                   /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_system.so.1.71.0
7f92ea65d000-7f92ea677000 r-xp 00000000 00:2e 110307889                  /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_filesystem.so.1.71.0
7f92ea677000-7f92ea876000 ---p 0001a000 00:2e 110307889                  /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_filesystem.so.1.71.0
7f92ea876000-7f92ea877000 r--p 00019000 00:2e 110307889                  /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_filesystem.so.1.71.0
7f92ea877000-7f92ea878000 rw-p 0001a000 00:2e 110307889                  /home/gmcbain/projects/nektar++/build-2020-12-21/dist/lib64/nektar++/thirdparty/libboost_filesystem.so.1.71.0Aborted (core dumped)

I've since also run ctest (as recommended in Section 1.3.2.3 of the Users Guide) and it's 100% passing, '0 tests failed out of 560'.