Trying to build Tango as dynamic library on linux

[jpf]

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?)

-- 
Johannes Pfau