Haskell 32 to 64 bit cross compilation

Question

I only have a x86_32 machine running Linux. On this machine I coded a small Haskell program.

Now I need to provide a x86_64 Linux binary.

Which is the easiest / less painful way to achieve that?

Answer 1

Borrow or rent (e.g. EC2) an x86_64 machine for long enough to compile your program. The latter would cost on the order of $0.01.

If this is not possible, then assuming you have a C cross-compiler to x86_64, you can try following the directions at https://ghc.haskell.org/trac/ghc/wiki/Building/CrossCompiling. However, as far as I know nobody has tried this before and I would be surprised if there are no bugs lurking for the case when the compiler's Int size is smaller than the target platform's word size.