On Thu, Oct 13, 2011 at 12:07 PM, Antoine Latter wrote:

On Thu, Oct 13, 2011 at 11:43 AM, Eugene Kirpichov wrote:

...

Hi cafe,

Ubuntu 11.10 has been released, which includes support for "multiarch" https://wiki.ubuntu.com/MultiarchSpec

Am I right that this will facilitate compiling Haskell code into x86 binaries on an x64 machine?

This would make it easier, but GHC is not a cross-compiling compiler, so you'd still need to install a separate GHC executable for 32-bit compiling.

This makes it so that apt can handle installing the 32-bit libraries to link against in a sane way, which I'm sure helps.

Ah, I was assuming here that multi-arch support only covered libraries, not applications and tools. 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. Interesting!

Antoine

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.

Hi, Am Donnerstag, den 13.10.2011, 22:26 +0400 schrieb Michael Lazarev:

It turns out that it is also possible to compile a 32-bit executable by 32-bit ghc under Ubuntu 11.10 x64. First, additional files supporting compilation for different architectures in gcc must be installed by "sudo apt-get install g++multilib". Second, one need to pass additional arguments to ghc: "-opta -m32 -optl -m32". They are, in turn, passed to gcc assembler and linker, respectively, telling them to build for 32-bit architecture.

Complete example:

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$ sudo apt-get install lib32gmp-dev g++multilib

$ cat ./Test.hs module Main where

import Control.Monad

getR :: Read r => IO r getR = liftM read getLine

main = liftM2 (+) getR getR >>= print

$ /home/ml/local/ghc/7.0.4-32/bin/ghc --make ./Test.hs -opta -m32 -optl -m32 Linking Test ...

$ file ./Test ./Test: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.15, not stripped

----------------------------------------------------------------------

Did you build the boot libraries and possible ghc also with these flags? Greetings, Joachim -- Joachim "nomeata" Breitner mail@joachim-breitner.de | nomeata@debian.org | GPG: 0x4743206C xmpp: nomeata@joachim-breitner.de | http://www.joachim-breitner.de/