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From: Wojciech Meyer <wojciech.meyer@googlemail.com>
To: caml-list@inria.fr
References: <20120321180213.GA1063@viper.local>
Date: Wed, 21 Mar 2012 18:40:25 +0000
In-Reply-To: <20120321180213.GA1063@viper.local> ("Ricardo Catalinas
	\=\?utf-8\?Q\?Jim\=C3\=A9nez\=22's\?\= message of "Wed, 21 Mar 2012 19:02:13 +0100")
Message-ID: <wffwd1pzl2.fsf@gmail.com>
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Subject: Re: [Caml-list] ocamlmklib fails with code compiled with ocamlopt -c

Ricardo Catalinas Jiménez <jimenezrick@gmail.com> writes:

> I found out the next issue when using the native compiler to generate a
> dynamic library from C:
>
>   $ ocamlopt -c foo.c
>   $ ocamlmklib -o foo foo.o
>   /usr/bin/ld: fsync.o: relocation R_X86_64_32 against `.rodata' can not
>   be used when making a shared object; recompile with -fPIC
>   fsync.o: could not read symbols: Bad value
>   collect2: ld returned 1 exit status
>
> But `man ocamlopt' reads:
>   -fPIC Generate position-independent machine code. This is the default.
>
> Anyway, I tried specifying manually `-fPIC' and it gave me the same
> error.
>
> But with `ocamlc -c' everything works as expected. Is this normal?

You have to use `-shared' command line option when compiling with ocamlopt.

- Wojciech