Test failures on FreeBSD and Mac (x86_64)

[hasufell]

On the branch release-ci, I run into the following test failures:

• FreeBSD: https://github.com/stable-haskell/ghc/actions/runs/17849982701/job/50765914007#step:5:607

  •  Unexpected failures:
       ghci/linking/T25240/T25240.run  T25240 [bad exit code (99): test timeout] (normal)
       rts/T7040_ghci.run              T7040_ghci [bad exit code (138)] (ghci)
    

• Mac: https://github.com/stable-haskell/ghc/actions/runs/17849982701/job/50759188827#step:10:595

  •  Unexpected failures:
       ghci/T13786/T13786.run  T13786 [bad exit code (2)] (normal)
       rts/T7040_ghci.run      T7040_ghci [bad exit code (138)] (ghci)
    

To reproduce, build the stuff:

• checkout the release-ci branch
• make CABAL=_build/stage0/bin/cabal CABAL_BUILD_ARGS="-v" _build/bindist/ghc.tar.gz _build/bindist/cabal.tar.gz _build/bindist/tests.tar.gz
• unpack all 3 tarballs into one directory
• go to the directory and the subdir testsuite/ and then run PATH=$(pwd)/../bin:$PATH THREADS=14 gmake TEST=T7040_ghci to run the offending test
• if you want to examine the exact calls to commands and reproduce manually without make, you need to edit testsuite/config/ghc and add

  •  config.verbose = 3
     config.cleanup = False
    

• now you can see the invocations and mess with the temporary build artifacts and e.g. pass -fPIC instead of -fno-PIC