@duog has documented workarounds in https://gitlab.haskell.org/ghc/ghc/-/issues/21936:
These /ghc/ flags reproduce -O0: -optlo-passes='module(default<O0>,function(mem2reg),globalopt,function(lower-expect))' -fno-llvm-tbaa -O0 These /ghc/ flags reproduce -O1: -optlo-passes='module(default<O1>,globalopt)' -O1 -fno-llvm-tbaa These /ghc/ flags reproduce -O2: -optlo-passes='module(default<O2>)' -O2 -fno-llvm-tbaa On Tue, Apr 25, 2023 at 11:35 AM George Colpitts <[email protected]> wrote: > the bug for this is https://gitlab.haskell.org/ghc/ghc/-/issues/22954 > > On Tue, Apr 25, 2023 at 10:54 AM George Colpitts < > [email protected]> wrote: > >> Thanks Moritz. I went ahead and tried it. On a very simple smoke test I >> observed that "-fllvm works" but "-O2 -fllvm" does not. It fails with >> "Cannot use -O# with legacy PM.". There is already a bug for changing ghc >> to work with the new pass manager. It wasn't clear to me that this would be >> needed for llvm 16. It seems that it is. >> >> Cheers >> George >> >> >> >> >> On Mon, Apr 24, 2023 at 10:02 PM Moritz Angermann < >> [email protected]> wrote: >> >>> Hi George, >>> >>> while I personally haven’t tried. I’d encourage you to just try. Unless >>> they changed their textual IR (they don’t do that often anymore), it could >>> just work. >>> >>> Whether or not you run into bugs for the specific target you are looking >>> at, is hard to say without knowing the target. >>> >>> My suggestion would be to just try building your configuration with the >>> llvm backend against llvm16, and run validate if you can. >>> >>> Cheers, >>> Moritz >>> >>> On Tue, 25 Apr 2023 at 4:50 AM, George Colpitts < >>> [email protected]> wrote: >>> >>>> Hi >>>> >>>> Does anybody know if llvm 16 works with ghc 9.6.1 ? >>>> >>>> Thanks >>>> George >>>> >>>> _______________________________________________ >>>> ghc-devs mailing list >>>> [email protected] >>>> http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs >>>> >>>
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