Bug#1023649: ghc: FTBFS haskell-random powerpc (ghc Segmentation fault)

[John Paul Adrian Glaubitz]

Hello!

I have been bisecting this issue but in order to be successful, I need a simple
reproducer which isn't trivial since I cannot just reuse the build directory of
an unsuccessful build due to the changing Haskell libraries for different GHC
versions.

Ideally, we should have a single command line with GHC which will trigger the
segmentation fault.

To bisect, I have done the following:

# git bisect start
# git bisect good ghc-8.10.7-release
# git bisect bad ghc-9.2.7-release
# git submodule update --init
# ./boot ; python3 boot
# echo "SRC_HC_OPTS += -lffi -latomic -optl-pthread" >> mk/build.mk && \
  echo "Stage1Only := YES" >> mk/build.mk && \
  echo 'utils/genprimopcode_CONFIGURE_OPTS += "-f-build-tool-depends"' \
  >> mk/build.mk && echo 'compiler_CONFIGURE_OPTS += "-f-build-tool-depends"' \
  >> mk/build.mk && echo 'utils/hpc_CONFIGURE_OPTS += "-f-build-tool-depends"' \
  >> mk/build.mk && echo "HADDOCK_DOCS := NO" >> mk/build.mk \
  && echo "BUILD_SPHINX_HTML := NO" >> mk/build.mk && echo "BUILD_SPHINX_PDF := NO" \
  >> mk/build.mk
# ./configure && make -j32

For newer versions, the build has to be performed with Hadrian, so the last step
would be:

# ./hadrian/build -j

Prior to using Hadrian for the first time, the package database needs to be updated:

# cabal update

Now, if I had a simple reproducer, it would be rather easy to bisect the issue.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
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