I was able to compile Haskell for a mips-linux-musl target (https://onion.io/omega). Most problems were due to the different architecture (MIPS) than musl. Once you have a C cross-compiler (I used http://crosstool-ng.org/ to built the cross-compiler toolchain), compiling GHC as a cross compiler for that target and then a Haskell application shouldn't be a problem.

If you have enough disk space on the target, I would suggest that you compile your Haskell application into a static binary.

On Sat, Apr 9, 2016 at 10:47 AM Lana Black <lanablack@amok.cc> wrote:
You will probably have better luck using ghc with musl‎.

Check out this thread: ‎https://mail.haskell.org/pipermail/haskell-cafe/2015-May/119843.html

  Original Message  
From: Patrick Pelletier
Sent: Saturday, April 9, 2016 7:54 AM
To: haskell-cafe
Subject: [Haskell-cafe] Haskell on OpenWRT

Has anyone had any success running Haskell programs on OpenWRT?

Specifically, I'm running OpenWRT on x86_64, so processor architecture
shouldn't be an issue. However, by default OpenWRT uses musl as its C
library, so binaries from a "normal" Linux system wouldn't be compatible
with OpenWRT.

I attempted to get around this problem by building an OpenWRT image with
glibc as the C library. In theory, that ought to solve the problem. In
practice, my program (a simple hello-world type program, which runs fine
on Ubuntu) hung, printing nothing, using nearly all of one core, and was
unkillable by any signal other than SIGKILL. If left alone to run, it
eventually used all available memory and then died.

I took a look at ldd, to see if there were any clues there. On my
Ubuntu 12.04 machine, where I compiled the program (using ghc 7.4.1), I get:

ppelletier@patrick64:~/programming/haskell$ ldd contact
linux-vdso.so.1 => (0x00007fff36f50000)
libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10
(0x00007f8d49cf8000)
libffi.so.6 => /usr/lib/x86_64-linux-gnu/libffi.so.6
(0x00007f8d49af0000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f8d497f3000)
librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f8d495eb000)
libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f8d493e7000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f8d49028000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007f8d48e0b000)
/lib64/ld-linux-x86-64.so.2 (0x00007f8d49f8d000)

On my OpenWRT (trunk) box, I get:

root@OpenWrt:~# ldd /tmp/contact
linux-vdso.so.1 (0x00007ffd2afcc000)
libgmp.so.10 => /usr/lib/libgmp.so.10 (0x00007f27a057a000)
libffi.so.6 => /usr/lib/libffi.so.6 (0x00007f27a0373000)
libm.so.6 => /lib/libm.so.6 (0x00007f27a0080000)
librt.so.1 => /lib/librt.so.1 (0x00007f279fe79000)
libdl.so.2 => /lib/libdl.so.2 (0x00007f279fc76000)
libc.so.6 => /lib/libc.so.6 (0x00007f279f906000)
libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00007f279f6f4000)
libpthread.so.0 => /lib/libpthread.so.0 (0x00007f279f4d9000)
/lib64/ld-linux-x86-64.so.2 (0x00007f27a07dc000)

This is almost the same, except it has "libgcc_s.so.1", while on the
Ubuntu box it does not.

I'd welcome any ideas on how to solve (or at least diagnose) this
problem. I'd also be interested in any thoughts on the broader question
of running Haskell programs on OpenWRT.

Thanks,

--Patrick

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