[fpc-pascal] LLVM LTO

Benito van der Zander benito at benibela.de
Tue Aug 15 17:24:56 CEST 2023


> -Clflto -Clflto-no-system -k-fuse-ld=gold -k-plugin=/path/to/LLVMgold.so 

that helped, but I have to do it without -Clflto-no-system, or it gives 
an error

Then I could run my unit tests:

FPC alone: 25 seconds
LLVM: 21 seconds
LLVM LTO: 20 seconds

does not seem to matter much

On 11.08.23 12:46, Jonas Maebe via fpc-pascal wrote:
> On 10/08/2023 17:06, Benito van der Zander via fpc-pascal wrote:
>> I tried to use the LLVM Link-Time-Optimization, -Clflto
> I should update the wiki page. Under Debian 11, I can tell FPC to use 
> gold with lto by specifying the following command line parameters: 
> -Clflto -Clflto-no-system -k-fuse-ld=gold -k-plugin=/path/to/LLVMgold.so
> Note that compiling the FPC RTL with LTO currently doesn't work under 
> Linux, because LLVM does not rename local labels in pure assembler 
> procedures when doing so, resulting in duplicate labels.
> It works fine when compiling FPC and its units normally, and then only 
> using LTO for your program.
> Jonas
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