[fpc-devel] Compile fpc with llvm

[Adriaan van Os]

On 18/07/2026 20:23, Jonas Maebe wrote:
> On 2026-07-18 15:27, Adriaan van Os via fpc-devel wrote:
>> With success I have built and used an fpc-3.3.1 based LLVM compiler.
>> The FPC LLVM Wiki <https://wiki.freepascal.org/LLVM> [1] says that
>> "the compiler itself on x86-64 is about 10% faster when compiled with
>> LLVM on an Intel Haswell processor, or 18% if you also enable
>> link-time optimization." I could not find how to do that (build the
>> compiler itself with llvm) as it requires starting with an fpc-3.2.2
>> compiler.
>
> You can add OVERRIDEVERSIONCHECK=1 to the make command disable the 
> version check. It's not advertised because using it in general is not 
> supported (only when building the exact same FPC revision from which 
> the compiler was built). 

Thanks, I will try that.

Regards,

Adriaan van Os