Re: [accelerate-haskell] runQ linking problems

[Trevor McDonell]

Hi Philip,

Sorry for the late reply, I'm currently away at a conference.

I encountered a similar problem recently which I should have fixed now, can you try updating to the latest GitHub version? You'll need to use ghc-8.6, but the special `Setup.hs` and -fplugin options are no longer required.

If that doesn't work, please open a ticket on the issue tracker: https://github.com/AccelerateHS/accelerate/issues/new

Thanks!

-Trev

On Fri, 16 Aug 2019 at 22:58, 'Phillip Seeber' via Accelerate <accelerat...@googlegroups.com> wrote:

Dear all,

i would like to use runQ in my code but get linking errors. I have a module Math with this contents:

{-# LANGUAGE TemplateHaskell #-}
module Math
( vectorProduct
) where
import qualified Data.Array.Accelerate as A
import qualified Data.Array.Accelerate.LLVM.Native as A
import qualified Data.Array.Accelerate.Numeric.LinearAlgebra as A
import           MathHelper

vectorProduct :: A.Vector Double -> A.Vector Double -> A.Scalar Double
vectorProduct = $( A.runQ vectorProduct' )

And in MathHelper:

module MathHelper
( vectorProduct'
) where
import qualified Data.Array.Accelerate as A
import qualified Data.Array.Accelerate.LLVM.Native as A
import qualified Data.Array.Accelerate.Numeric.LinearAlgebra as A

vectorProduct' :: A.Acc (A.Vector Double) -> A.Acc (A.Vector Double) -> A.Acc (A.Scalar Double)
vectorProduct' = (A.<.>)

And my cabal file has been changed to a custom setup as described in the Accelerate documentation:

build-type:     Custom
custom-setup
  setup-depends:
      Cabal
    , accelerate-llvm-native
    , base

library
  exposed-modules:
      Math
      MathHelper
  ghc-options: -O2 -Wall -Wno-unused-matches -Wno-unused-top-binds -Wno-type-defaults -fplugin=Data.Array.Accelerate.LLVM.Native.Plugin
  build-depends:
      accelerate >=1.3.0.0 && <=1.4.0.0
    , accelerate-blas >=0.3.0.0 && <=0.4.0.0
    , accelerate-llvm >=1.3.0.0 && <=1.4.0.0
    , accelerate-llvm-native >=1.3.0.0 && <=1.4.0.0

and finally the Setup.hs

import Data.Array.Accelerate.LLVM.Native.Distribution.Simple
main = defaultMain

But when building (with stack) i get multiple linking errors:

/usr/bin/ld.bfd: /user/seeber/.cache/accelerate/accelerate-llvm-1.3.0.0/accelerate-llvm-native-1.3.0.0/llvm-hs-8.0.0/x86_64-unknown-linux-gnu/skylake-avx512/rel/meepcbe253e948d483557
1fe7b4a933a11005889f64abcddc2704e46f236b607b0a4.o: in function `foldAllP1_cbe253e948d4835571fe7b4a933a11005889f64abcddc2704e46f236b607b0a4':
:(.text+0x220): multiple definition of `foldAllP1_cbe253e948d4835571fe7b4a933a11005889f64abcddc2704e46f236b607b0a4'; /user/seeber/.cache/accelerate/accelerate-llvm-1.3.0.0/accelerate
-llvm-native-1.3.0.0/llvm-hs-8.0.0/x86_64-unknown-linux-gnu/skylake-avx512/rel/meepcbe253e948d4835571fe7b4a933a11005889f64abcddc2704e46f236b607b0a4.o::(.text+0x220): first defined he
re
(...)
collect2: error: ld returned 1 exit status
`gcc' failed in phase `Linker'. (Exit code: 1)

The LLVM is version 8.0.1, gcc 7.4.0 and ld 2.31.1.20180828-lp151.2. Could anyone give me some tips, how this problem can be solved?

Thank you in advance and best wishes

Phillip

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[Phillip Seeber]

Hi Trevor,

thank you very much for your hint. Indeed, the most current version doesn't have this issue. I also found the comment message on github, sorry for not testing this first.

Best wishes

Phillip

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