Dynamic loading of shared libraries.

[Andrei Alexandrescu]

On 6/13/11 10:33 AM, Jens Mueller wrote:
> Andrei Alexandrescu wrote:
>> On 6/13/11 4:27 AM, Jens Mueller wrote:
>>> Steve Teale wrote:
>>>> Can DMD D2/Linux do this yet?
>>>
>>> dmd can't do it yet. But if all you want is to link a against a shared
>>> library you can try the following:
>>>
>>> 1. Create a shared library
>>> $ gcc -m64 -fPIC -shared shared.c -o libshared.so
>>>
>>> 2. Building (without linking using dmd)
>>> $ dmd -m64 -c dynamic.d -ofdynamic.o
>>>
>>> 3. Use gcc as linker
>>> $ gcc -m64 dynamic.o /path/to//libphobos2.a -L. -lshared -lrt -o dynamic
>>>
>>> 4. Execute
>>> $ ./dynamic
>>> Hello from shared
>>>
>>> I attached the files shared.c and dynamic.d, if you want to try
>>> yourself.
>>>
>>> Jens
>>
>> Jens,
>>
>>
>> Two questions - first, what steps do we need to take to convince the
>> linker call from within dmd to work as above?
>
> Never thought about that. Just tried.
> $ dmd -m64 dynamic.o /path/to/libphobos2.a -L-L. -L-lshared -L-lrt -ofdynamic
> works.

Great. Wonder why the path to Phobos is still needed - does using -L 
preclude all implicit uses of it?

>> Second, how about the converse - loading a shared library from a
>> program written in either C or D?
>
> Don't know exactly what you mean. As far as I know dmd is not able to
> generate shared libraries. Is that your question?

Yah, I was wondering if it's just PIC generation or something extra.


Andrei