is there a roadmap for druntime/phobos support of shared libraries?

just built dmd from master, and I still can't coax out a 64 bit .so

On 4/5/2013 7:18 PM, Ellery Newcomer wrote:
> is there a roadmap for druntime/phobos support of shared libraries?
>
> just built dmd from master, and I still can't coax out a 64 bit .so

awaiting:

https://github.com/D-Programming-Language/phobos/pull/1240

On 04/05/2013 07:22 PM, Walter Bright wrote:
> On 4/5/2013 7:18 PM, Ellery Newcomer wrote:
>> is there a roadmap for druntime/phobos support of shared libraries?
>>
>> just built dmd from master, and I still can't coax out a 64 bit .so
>
> awaiting:
>
> https://github.com/D-Programming-Language/phobos/pull/1240

goody

On 2013-04-06 04:22, Walter Bright wrote:

> awaiting:
>
> https://github.com/D-Programming-Language/phobos/pull/1240

Everything in druntime is done?

-- 
/Jacob Carlborg

On 04/05/2013 07:22 PM, Walter Bright wrote:
> On 4/5/2013 7:18 PM, Ellery Newcomer wrote:
>> is there a roadmap for druntime/phobos support of shared libraries?
>>
>> just built dmd from master, and I still can't coax out a 64 bit .so
>
> awaiting:
>
> https://github.com/D-Programming-Language/phobos/pull/1240

trying out the spiffy new shared lib support, I get this:

dmd  -unittest -fPIC -defaultlib=phobos2so -shared test1.d -oflibtest1.so
gcc  test1.c `pwd`/libtest1.so -L/usr/lib64/dmd/ -L/usr/lib/dmd/ -o test1.x
/lib64/libphobos2so.so: undefined reference to `_Dmain'
collect2: error: ld returned 1 exit status


_Dmain? wat?

On 4/6/2013 7:15 PM, Ellery Newcomer wrote:
> dmd  -unittest -fPIC -defaultlib=phobos2so -shared test1.d -oflibtest1.so
> gcc  test1.c `pwd`/libtest1.so -L/usr/lib64/dmd/ -L/usr/lib/dmd/ -o test1.x
> /lib64/libphobos2so.so: undefined reference to `_Dmain'
> collect2: error: ld returned 1 exit status
>
>
> _Dmain? wat?

_Dmain is the mangled name for main() in your program.

On 2013-04-07 04:15, Ellery Newcomer wrote:

> trying out the spiffy new shared lib support, I get this:
>
> dmd  -unittest -fPIC -defaultlib=phobos2so -shared test1.d -oflibtest1.so
> gcc  test1.c `pwd`/libtest1.so -L/usr/lib64/dmd/ -L/usr/lib/dmd/ -o test1.x
> /lib64/libphobos2so.so: undefined reference to `_Dmain'
> collect2: error: ld returned 1 exit status
>
>
> _Dmain? wat?

It's declared in druntime and therefore expected to be included:

https://github.com/D-Programming-Language/druntime/blob/master/src/rt/dmain2.d#L348

I think it needs weak linkage or similar. I don't know if it's possible to do in D, but in C it can be done like this:

https://github.com/D-Programming-Language/druntime/blob/master/src/rt/dylib_fixes.c

Don't know if that is compiled and linked. There probably needs to be a way to exclude the C main function as well.

-- 
/Jacob Carlborg

On 04/07/2013 10:21 AM, Jacob Carlborg wrote:
> On 2013-04-07 04:15, Ellery Newcomer wrote:
> I think it needs weak linkage or similar. I don't know if it's possible
> to do in D, but in C it can be done like this:
>
> https://github.com/D-Programming-Language/druntime/blob/master/src/rt/dylib_fixes.c
>
>
Yes, druntime should only weakly link against _Dmain.

On 04/06/2013 04:22 AM, Walter Bright wrote:
> On 4/5/2013 7:18 PM, Ellery Newcomer wrote:
>> is there a roadmap for druntime/phobos support of shared libraries?
>>
>> just built dmd from master, and I still can't coax out a 64 bit .so
> 
> awaiting:
> 
> https://github.com/D-Programming-Language/phobos/pull/1240

I see it's been added :-)

Are there any extra flags that need to be added to dmd.conf for this to work successfully?  On my system I find that the shared library is not found when running programs built against it:

   error while loading shared libraries: libphobos2so.so: cannot load shared
object file: no such file or directory

I can get round this by exporting /opt/dmd/lib to LD_LIBRARY_PATH but if I recall right, this is a frowned-upon way of identifying where shared libraries are to be found ...

Am Sun, 07 Apr 2013 18:36:04 +0200
schrieb Joseph Rushton Wakeling <joseph.wakeling@webdrake.net>:

> On 04/06/2013 04:22 AM, Walter Bright wrote:
> > On 4/5/2013 7:18 PM, Ellery Newcomer wrote:
> >> is there a roadmap for druntime/phobos support of shared libraries?
> >>
> >> just built dmd from master, and I still can't coax out a 64 bit .so
> > 
> > awaiting:
> > 
> > https://github.com/D-Programming-Language/phobos/pull/1240
> 
> I see it's been added :-)
> 
> Are there any extra flags that need to be added to dmd.conf for this to work successfully?  On my system I find that the shared library is not found when running programs built against it:
> 
>    error while loading shared libraries: libphobos2so.so: cannot load
> shared object file: no such file or directory
> 
> I can get round this by exporting /opt/dmd/lib to LD_LIBRARY_PATH but if I recall right, this is a frowned-upon way of identifying where shared libraries are to be found ...
> 

In theory: Add the .so directory to /etc/ld.so.conf, run ldconfig http://linux.die.net/man/8/ldconfig

But: This usually requires proper version information in the .so library and a properly set soname. I doubt anyone has looked into that yet.