I think it's gone the other way in POSIX. Casting function pointers to/from void * is required by dlsym and that's part of the XSI extensions which are optional. However dlsym moved from XSI to Base and now conversion between function pointers and void * is required to work correctly.
That's all somewhat moot though. I don't think anyone should really expect POSIX conformance from an embedded microcontroller :-) Mike On 07/05/2021 10:58, Philipp Klaus Krause wrote: > Am 07.05.21 um 11:50 schrieb Павел Бельтюков: >> Hi, Philipp >> >> Using the normal C syntax. >> Function pointers are always 24 bits in the large model, while they are >> always 16 bits in the medium model. >> Thus, you can't just link files compiled using the medium model with >> files compiled using the large model. >> >> >> OK, then how do I cast a function pointer to void * and backward? >> >> Best regards, >> Paul Beltyukov > You don't. > > The C standard (unlike POSIX¹) does not require C implementations to > support casts between function pointers and void *, though this feature > is mentioned as a common extension in the non-normative Annex J.5.7. > > If you need a type that can hold a pointer to anything (object or > function), a union could be an option. > > Philipp > > ¹ I haven't checked the POSIX stanard now, but AFAIR, while POSIX still > allows such casts, it is considered an obsolescent feature there. > > > _______________________________________________ > Sdcc-user mailing list > Sdcc-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/sdcc-user _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
