Hello!
2011/10/13 Antoine Latter
It looks like some applications will be flagged as multiarch, so maybe you'll be able to install two GHCs side-by-side with apt.
I used x64 edition of Ubuntu 11.10 for a while, and was able to run both 64-bit and 32-bit GHCs. Both GHCs were manually set-up (i.e. download; tar xvjf ...; ./configure --prefix=...; make install) All is needed is to install both versions of libgmp by "apt-get install libgmp3-dev lib32gmp-dev" 32-bit version runs ghci fine, but I actually cannot compile stuff with it. Haven't looked deeply into that issue, though. The error is like the following: *** Assembler: /usr/bin/gcc -I.. -c /tmp/ghc6285_0/ghc6285_0.s -o ../Test.o -fno-stack-protector -DDONT_WANT_WIN32_DLL_SUPPORT /tmp/ghc6285_0/ghc6285_0.s: Assembler messages: /tmp/ghc6285_0/ghc6285_0.s:29:0: Error: invalid instruction suffix for `push' Maybe the issue can be resolved by figuring out how to target gcc for 32-bit build.