Dear GHC team, Ubuntu applies the following patch to the ghc package¹: diff -pruN 7.0.4-8/aclocal.m4 7.0.4-8ubuntu1/aclocal.m4 --- 7.0.4-8/aclocal.m4 2011-10-31 16:22:09.000000000 +0000 +++ 7.0.4-8ubuntu1/aclocal.m4 2011-10-31 16:22:20.000000000 +0000 @@ -109,6 +109,10 @@ AC_DEFUN([FPTOOLS_SET_C_LD_FLAGS], $4="$$4 -arch x86_64" $5="$$5 -m64" ;; + *-linux*) + $3="$$3 -Wl,--hash-style=both,--no-copy-dt-needed-entries,--as-needed" + $4="$$4 --hash-style=both --no-copy-dt-needed-entries --as-needed" + ;; esac # If gcc knows about the stack protector, turn it off. and it was requested² that this should be done in Debian as well. I generally feel uneasy diverging from upstream, as it could make debugging harder, so I’m contacting you first whether you might be interested in applying the change to ghc proper. I did not dig deep into the reason behind the patch, but http://wiki.debian.org/ToolChain/DSOLinking seems to give some reasons, and the author of the patch, Matthias Klose, is CCed. Greetings, Joachim ¹ http://patches.ubuntu.com/g/ghc/ghc_7.0.4-8ubuntu1.patch ² http://lists.debian.org/debian-haskell/2011/10/msg00066.html -- Joachim "nomeata" Breitner Debian Developer nomeata@debian.org | ICQ# 74513189 | GPG-Keyid: 4743206C JID: nomeata@joachim-breitner.de | http://people.debian.org/~nomeata