[Haskell-cafe] strange link error

[Brandon Allbery]

That error message looks like it's coming from TH instead of final
link, so you may need to do something else to make it available to TH
during compile.

On Mon, Jan 10, 2022 at 3:50 AM PICCA Frederic-Emmanuel
<frederic-emmanuel.picca at synchrotron-soleil.fr> wrote:
>
> Hello, I try to build a project which use C libraries.
>
> during the developpement I want to link directly with the work in progress libraries.
> So I added this in cabal.
>
> executable binoculars-ng
>   [...]
>
>   if flag(useHklDev)
>     pkgconfig-depends: gobject-2.0
>     ghc-options: -pgml
>     ghc-options: gcc
>     ghc-options: "-optl-Wl,--allow-multiple-definition"
>     ghc-options: "-optl-Wl,--whole-archive,../../hkl/.libs/libhkl.a,--no-whole-archive"
>     ghc-options: "-optl-Wl,--whole-archive,../../binoculars/libhkl-binoculars.a,--no-whole-archive"
>
> at the end I have a working executable.
>
> Building executable 'binoculars-ng' for hkl-0.1.0.0..
> [1 of 1] Compiling Main             ( app/Binoculars.hs, /home/experiences/instrumentation/picca/src/repo.or.cz/hkl/contrib/haskell/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hkl-0.1.0.0/x/binoculars-ng/build/binoculars-ng/binoculars-ng-tmp/Main.o )
> Linking /home/experiences/instrumentation/picca/src/repo.or.cz/hkl/contrib/haskell/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hkl-0.1.0.0/x/binoculars-ng/build/binoculars-ng/binoculars-ng ...
>
>
> But now I would like to create an unit test so I added this in  cabal
>
> test-suite hkl-test
>    [...]
>   if flag(useHklDev)
>     pkgconfig-depends: gobject-2.0
>     ghc-options: -pgml
>     ghc-options: gcc
>     ghc-options: "-optl-Wl,--allow-multiple-definition"
>     ghc-options: "-optl-Wl,--whole-archive,../../hkl/.libs/libhkl.a,--no-whole-archive"
>     ghc-options: "-optl-Wl,--whole-archive,../../binoculars/libhkl-binoculars.a,--no-whole-archive"
>
> but this time during the compilation I end up with this error message
>
> [1 of 3] Compiling Paths_hkl        ( /home/experiences/instrumentation/picca/src/repo.or.cz/hkl/contrib/haskell/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hkl-0.1.0.0/t/hkl-test/build/hkl-test/autogen/Paths_hkl.hs, /home/experiences/instrumentation/picca/src/repo.or.cz/hkl/contrib/haskell/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hkl-0.1.0.0/t/hkl-test/build/hkl-test/hkl-test-tmp/Paths_hkl.o )
> [2 of 3] Compiling BinocularsSpec   ( test/BinocularsSpec.hs, /home/experiences/instrumentation/picca/src/repo.or.cz/hkl/contrib/haskell/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hkl-0.1.0.0/t/hkl-test/build/hkl-test/hkl-test-tmp/BinocularsSpec.o )
> <command line>: /home/experiences/instrumentation/picca/src/repo.or.cz/hkl/contrib/haskell/dist-newstyle/build/x86_64-linux/ghc-8.8.4/hkl-0.1.0.0/build/libHShkl-0.1.0.0-inplace-ghc8.8.4.so: undefined symbol: hkl_binoculars_cube_free
>
> both the executable  and the test  use this hkl_binoculars_cube_free function.
>
> So are you aware of a difference between test suit and executable during the build.
>
> more precisely are both  executables compiled differently ?
>
> thanks for you help
>
> Frederic
>
>
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com