jonas.maebe at elis.ugent.be
Fri Nov 27 12:36:56 CET 2015
Maciej Izak wrote:
> 2015-11-27 11:59 GMT+01:00 Jonas Maebe <jonas.maebe at elis.ugent.be
> <mailto:jonas.maebe at elis.ugent.be>>:
> No. LLVM IR platform dependent. So if you want to compile Pascal to
> platform to FPC. That includes both compiler and RTL support.
> I thought it would be simpler.
If you perform a readln, you need to call some kind of OS or platform
cannot access the system calls or C library of the underlying operating
system (and if you could, it wouldn't help much, since you would want to
read from a browser Windows), so you need an RTL.
In general, as I've mentioned several times before on this list, LLVM is
not a panacea:
* LLVM IR completely platform dependent, so it does not automagically
give us access to all targets supported by Clang/LLVM. In particular the
way calling conventions are handled is completely platform dependent,
and you cannot generate "generic LLVM IR" that will work on all
platforms (at least not in an ABI-compliant way), and of course the size
* LLVM does not care about backward compatibility, so FPC will always
only support a subset of available LLVM versions
* LLVM does not support the Borland "register" calling convention, so
i386 support will be impossible until someone adds that to LLVM
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