Linux deployment requirements for GHC-produced binaries

[Carter Schonwald]

I remember Tim Dysinger telling me  some incantations needed to statically
link Gmp into the static binary before deployment.  I'll pester him to re
remember what's needed, but the point is there's a way.

On Wednesday, October 9, 2013, Yitzchak Gale wrote:

> > You may need to resort to
> > strace to find out what's trying to pull in libgmp.so.whatever.
>
> I don't know how to do that. And anyway, I don't have access to
> the machine on which the customer is reporting this. I do believe
> the report - there is no compilation going on here, they are
> only running our GHC-compiled binary. They know nothing
> about GHC (not even that we are using it).
>
> I was hoping that there would be some general knowledge about
> this so I could just pass it on to our customers. But I see everyone
> else is as surprised as I am about a supposedly static GHC-compiled
> binary requiring a libgmp.so to run.
>
> > Unless this
> > program is like xmonad and requires ghc behind the scenes to build
> > something, in which case you would indeed need everything that ghc
> requires
> > (and, of course, ghc itself).
>
> No definitely not.
>
> Erik de Castro Lopo wrote:
> >>> I suspect the OP's exectuable is already being compiled static.
>
> I compiled it static.
>
> Brandon Allbery wrote:
> >> Yes; which leaves the question of why it requires libgmp.so, and if it's
> >> static the only things I can think of are (a) it's using dlopen(), or
> (b)
> >> it's running something else that is not static and requires libgmp.so.
>
> Right.
>
> Could a dependent library be causing this? For example, this
> program depends on direct-sqlite, which in turn links to
> sqlite via FFI. It also depends on wai, which pulls in quite a few
> indirect dependencies.
>
> If so - how would I investigate this and get a complete list of
> the system libraries that customers are required to install
> as prerequisites?
>
> Jens Petersen wrote:
> > You built ghc yourself?
>
> No. It is the generic Linux binary tarball from GHC HQ.
>
> > And ran ldd on $bindir/ghc or  $libdir/ghc-version ?
>
> No, in $bindir that's just a shell script. It's in $libdir.
> The executable is ghc; ghc-version is a directory containing
> object files compiled from libraries.
>
> Thanks,
> Yitz
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