[fpc-devel] Compile fpc with llvm

Adriaan van Os adriaan at adriaan.biz
Sat Jul 18 15:27:15 CEST 2026


With success I have built and used an fpc-3.3.1 based LLVM compiler. The 
FPC LLVM Wiki <https://wiki.freepascal.org/LLVM> 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.

Thanks,

Adriaan van Os
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