Trying to build Tango as dynamic library on linux

[Jacob Carlborg]

On 2010-06-29 19.55, jpf wrote:
> On 29.06.2010 11:08, Jacob Carlborg wrote:
>> On 2010-06-27 12:35, jpf wrote:
>>> Hi,
>>> are you still working on that? I tried to use druntime as a dynamic
>>> library on
>>> Linux, and I had exactly the same problem. (version node not found for
>>> symbol
>>> _d_throw at 4)
>>> Googling showed that this problem has been discussed before:
>>> http://digitalmars.com/d/archives/digitalmars/D/libphobos_as_.so_54793.html
>>>
>>>
>>> So because of the extern(Windows) / _stdcall calling convention, dmd
>>> emits the @4
>>> (
>>> http://en.wikipedia.org/wiki/Name_mangling#C_name_decoration_in_Microsoft_Windows
>>>
>>> )
>>> If I understand this
>>> http://people.redhat.com/drepper/symbol-versioning
>>> correctly, ELF uses symbol names like _d_throw at 4 as name at version. As
>>> there is no
>>> entry for version 4, linking fails. I guess mac is not affected,
>>> because Mach-O
>>> accepts _d_throw at 4 as a symbol name.
>>>
>>> It seems like nothing has changed since then.
>>> http://www.dsource.org/projects/druntime/browser/trunk/src/rt/deh2.d
>>> http://www.dsource.org/projects/druntime/browser/trunk/src/rt/deh.c
>>>
>>> _d_throw is still extern(Windows) / _stdcall and i guess dmd would
>>> still emit calls
>>> to _d_throw at 4 if _d_throw was changed to extern(C).
>>>
>>> Btw: Someone seems to have found a basic workaround for the name
>>> mangling problem:
>>> http://www.curoles.com/j/dso/dso.html
>>>
>>> But i guess, this should really be fixed in the compiler and druntime.
>>
>> I've managed to solve the linker error as shown on the last link and
>> then got the same problem (segmentation fault) as on that site. Is this
>> a problem with the compiler or the runtime?
>>
> Same problem here. (With the dmd and druntime patches, so it's not
> related to the objcopy workaround)
>
> Having a short look at the relevant druntime source, I don't see how
> this problem could be caused by druntime. My debugging / asm skills
> aren't very advanced however, so I can't really tell. I guess Sean Kelly
> or Walter could say more on that. Maybe we should ask on the dmd-devel
> or the phobos mailing list (or is there a list for druntime?)

That is a good idea, I don't think there is a mailing list for druntime.


-- 
Jacob Carlborg