[Haskell-cafe] creating standalone executable with haskell

[Damien Mattei]

thank for all the advices,
i will keep all that in mind when it's time to update the DB on the server.
regards,
damin

On Tue, Mar 5, 2019 at 1:33 PM Niklas Hambüchen <mail at nh2.me> wrote:

> The two topics of creating standalone executables, and you not being a
> system admin, are very separate and don't have much to do with each other.
>
> On the admin topic:
> You can set up a full Haskell build environment in your home directory
> even if you are not an admin.
>
> On the standalone executable topic:
> Most Haskell compiled executables can easily run on other Linux systems.
> In the default build, a Haskell executable has only a few runtime
> dependencies via dynamic linking. Here's and example for a HelloWorld
> program when compiled with `ghc --make`:
>
>     % ldd Hello
>         linux-vdso.so.1 =>  (0x00007ffcd9dea000)
>         libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f3799dcd000)
>         libgmp.so.10 => /usr/lib/x86_64-linux-gnu/libgmp.so.10
> (0x00007f3799b4d000)
>         librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007f3799945000)
>         libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f3799741000)
>         libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
> (0x00007f3799524000)
>         libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f379915a000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007f379a0d6000)
>
> As you can see, a few C libraries must be present on the system.
> They are already present on most systems.
> Again, you don't need to be admin to get those; if they are missing, you
> can also ship them along with your executable and set LD_LIBRARY_PATH.
>
> In general, executables created this way on one Linux flavour work
> reasonably well on other Linux flavours, but not always.
> And example (if I remember correctly) where it doesn't work, is Centos 6
> vs. newer Debian; one has libgmp.so.3 and one libgmp.so.6.
> This means that if you are using the default dynamic linking of C
> dependencies, you may have to ship "a few" (usually two) flavours of your
> executable.
> In general, executables created on one OS version work well on newer ones,
> e.g. something created on Ubuntu 16.04 will work well on newer Ubuntus.
>
> You can also link everything statically.
> Then your executable should work on any Linux system.
> But you need to learn a few more things to do so; I try to make it as
> convenient as possible with my project
>     https://github.com/nh2/static-haskell-nix/
>
> Niklas
>
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