Re: [Caml-list] static linking

[Gerd Stolpmann <info@gerd-stolpmann.de>]

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I'd strongly recommend against linking statically libc and other core
system libraries (e.g. libm, libdl, librt, ...). This creates more
problems than it solves. Instead, only link those libraries statically
that are causing the trouble. Unfortunately, this isn't directly
possible by just passing a linker option, but there is a solution by
rewriting the linker arguments:

See the attached script gcc_wrapper.sh (I'm using this or a derivative,
depending on the system). Just tell ocaml to use this script as C
compiler:

ocamlopt ... -cc ./gcc_wrapper.sh ...

Also set the environment variable STATIC_LIBS to the names of the
libraries you'd like to link statically (e.g. STATIC_LIBS="pcre z" would
select libpcre and libz).

The script here is only activated when there is an

  -o <name>.opt

argument. You may want to modify this part. (I'm just taking the version
of the script from the plasma project; some more work is required to
make it fully generic.)

Gerd


Am Freitag, den 06.06.2014, 23:43 +0800 schrieb Andreea Costea:
> Hi,
> 
> 
> I'm trying to build a rather big system written in Ocaml, using
> ocamlbuild. I managed to set all the needed flags nicely, so that the
> resulted binaries can run on any Unix machine, independent on their
> Ocaml distribution. However, on certain machines I have problems with
> the compatibility between the C libraries. Hence, I tried using
> "-ccopt -static"  for the -lflags and -cflags, respectively, in order
> to produce the desired statically linked binaries while building the
> project. Unfortunately, this attempt leads to the following error:
> 
> 
> "/usr/bin/ld: dynamic STT_GNU_IFUNC symbol `cos' with pointer equality
> in
> `/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/libm.a(s_sin.o)' can not be used when making an executable; recompile with -fPIE and relink with -pie"
> 
> 
> Does this mean I need to recompile the gcc libraries using -pie? Or
> does it mean I am using the wrong method to build the standalone
> executable? Any recommendation to modify the building process (i would
> prefer to use ocambuild)? 
> 
> 
> Your answer is much appreciated,
> Andreea
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 

-- 
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Gerd Stolpmann, Darmstadt, Germany    gerd@gerd-stolpmann.de
My OCaml site:          http://www.camlcity.org
Contact details:        http://www.camlcity.org/contact.html
Company homepage:       http://www.gerd-stolpmann.de
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