`duplicate symbol` compilation error on some versions of gcc on mac

[pmocz]

Using gcc 13.3.0 on macOS 15.2.

I cannot compile the code and get the error:

ld: warning: ignoring duplicate libraries: 'framework/libntt_framework.a', 'global/libntt_global.a'
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)1, metric::Minkowski<(Dimension)1>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)1, metric::Minkowski<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)2, metric::KerrSchild0<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)1, metric::QSpherical<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)2, metric::QKerrSchild<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)2, metric::QKerrSchild<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)1, metric::Spherical<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)1, metric::Minkowski<(Dimension)3>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)2, metric::KerrSchild0<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)1, metric::Spherical<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo name for ntt::Engine<(ntt::SimEngine::type)2, metric::KerrSchild<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)1, metric::QSpherical<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)1, metric::Minkowski<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)1, metric::Minkowski<(Dimension)3>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)2, metric::KerrSchild<(Dimension)2>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
duplicate symbol 'typeinfo for ntt::Engine<(ntt::SimEngine::type)1, metric::Minkowski<(Dimension)1>>' in:
    engines/libntt_engines.a[4](engine_run.cpp.o)
    engines/libntt_engines.a[2](engine_printer.cpp.o)
    engines/libntt_engines.a[3](engine_init.cpp.o)
    engines/libntt_engines.a[5](engine_step_report.cpp.o)
ld: 16 duplicate symbols
collect2: error: ld returned 1 exit status

It compiles on linux

[haykh]

Solved with #81