Adriaan van Os via fpc-devel <fpc-devel@lists.freepascal.org> schrieb am Mi., 30. Okt. 2024, 06:50:
> Sven Barth via fpc-devel wrote: > > Adriaan van Os via fpc-devel <fpc-devel@lists.freepascal.org > > <mailto:fpc-devel@lists.freepascal.org>> schrieb am Di., 29. Okt. 2024, > > 15:47: > > The idea of building the RTL in a dynamic ibrary is to have one copy > > of the RTL threadvars, notably > > one copy of the _ExceptObjectStack threadvar. Will this still be > > true if a main program and a > > dynamic library both include sysinit.o ? > > > > > > The sysinit unit contains the entrypoint and directly references symbols > > provided by the main program, not the RTL, to pass them into the RTL. It > > simply can't be inside a library. The exception handling is inside the > > System and SysUtils units, so no conflict there. > > sysinit.o contains _FPC_LIBMAIN and thus has to be linked in when creating > a dynamic library > compiled with FPC. The crucial question is — do we then end up with one or > two copies of the > _ExceptObjectStack threadvar ? > _FPC_LIBMAIN is for files with the header "library". Units moved to a shared library don't have a need for that symbol, because they'll be called from the main program. And if you should have a FPC library then you need to make sure that it's linked against the same shared RTL library to avoid issues. Only if a library links in its own RTL there will be separate symbols instead of shared ones. Regards, Sven >
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