more fun with ubuntu

I have a project here which fails on link on ubuntu 12.10. It give undefined reference errors for functions in libdl and libutil. For some reason, ld won't cooperate unless you pass -ldl -lutil at the end of the command string. Holy Ubuntu! I can't seem to get dmd to do this though. Any suggestions? I am using the beta, but apparently this is a thing with ubuntu.

On Sunday, 26 May 2013 at 05:01:10 UTC, Ellery Newcomer wrote: > I have a project here which fails on link on ubuntu 12.10. > > It give undefined reference errors for functions in libdl and libutil. For some reason, ld won't cooperate unless you pass -ldl -lutil at the end of the command string. Holy Ubuntu! > > I can't seem to get dmd to do this though. Any suggestions? > > I am using the beta, but apparently this is a thing with ubuntu. I have the same on Fedora 18 using derelict and some other D libs which I can't remember right now. My understanding is derelict requires libdl for dynamic loading of libs at runtime. My compiler flags are similar to this: dmd -gc -w -Iderelict_import_dir -L-Lderelict_lib_dir -L-lDerelictGL3 -L-lDerelictGLFW3 -L-lDerelictUtil -L-lGL -L-lGLU -L-lglfw -L-ldl myapp.d Could you post your compiler command line? Cheers, Stewart

On 05/25/2013 10:20 PM, estew wrote: > On Sunday, 26 May 2013 at 05:01:10 UTC, Ellery Newcomer wrote: >> I have a project here which fails on link on ubuntu 12.10. >> >> It give undefined reference errors for functions in libdl and libutil. >> For some reason, ld won't cooperate unless you pass -ldl -lutil at the >> end of the command string. Holy Ubuntu! >> >> I can't seem to get dmd to do this though. Any suggestions? >> >> I am using the beta, but apparently this is a thing with ubuntu. > > I have the same on Fedora 18 using derelict and some other D libs which > I can't remember right now. My understanding is derelict requires libdl > for dynamic loading of libs at runtime. > > My compiler flags are similar to this: > > dmd -gc -w -Iderelict_import_dir -L-Lderelict_lib_dir -L-lDerelictGL3 > -L-lDerelictGLFW3 -L-lDerelictUtil -L-lGL -L-lGLU -L-lglfw -L-ldl myapp.d > > Could you post your compiler command line? > > Cheers, > Stewart huh. I haven't run into it on fedora. python is built differently, though. dmd -L-lpthread -L-ldl -L-lutil -L-L/usr/lib -L-lz /usr/lib/python2.7/config/libpython2.7.a -debug -ofbuild/lib.linux-x86_64-2.7/link {lotsaobjectfiles} -L-ldl -L-lutil -v

> > huh. I haven't run into it on fedora. python is built differently, though. > > dmd -L-lpthread -L-ldl -L-lutil -L-L/usr/lib -L-lz /usr/lib/python2.7/config/libpython2.7.a -debug -ofbuild/lib.linux-x86_64-2.7/link {lotsaobjectfiles} -L-ldl -L-lutil -v Well, that should work fine, although the libs are generally referenced after the object files that require them, which you have for dl and util. ld changed a while back now (around Fedora 13 or 14 I think) which introduced similar behaviour. This may provide some more information or links: http://fedoraproject.org/wiki/Features/ChangeInImplicitDSOLinking Sorry I cannot really help....hopefully a D/Linux guru out there know more? Cheers, Stewart

On 05/26/2013 07:55 AM, Jesse Phillips wrote: > On Sunday, 26 May 2013 at 05:01:10 UTC, Ellery Newcomer wrote: >> I have a project here which fails on link on ubuntu 12.10. >> >> It give undefined reference errors for functions in libdl and libutil. >> For some reason, ld won't cooperate unless you pass -ldl -lutil at the >> end of the command string. Holy Ubuntu! >> >> I can't seem to get dmd to do this though. Any suggestions? >> >> I am using the beta, but apparently this is a thing with ubuntu. > > It is not uncommon to request the libraries needed to build your app. > Dmd passes a couple/one for phobos dependencies, but other libraries > need to be reqested. I am doing that. I think the problem is libpython2.7.a requires libdl and libutil, and ld requires -ldl and -lutil be positioned after libpython2.7.a, but dmd very stubbornly arranges them before libpython2.7.a in the call to gcc.

May 26, 2013

Re: more fun with ubuntu

Posted by Ellery Newcomer
in reply to Ellery Newcomer

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Ellery Newcomer

Posted in reply to Ellery Newcomer

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On 05/26/2013 08:10 AM, Ellery Newcomer wrote:
> On 05/26/2013 07:55 AM, Jesse Phillips wrote:
>> On Sunday, 26 May 2013 at 05:01:10 UTC, Ellery Newcomer wrote:
>>> I have a project here which fails on link on ubuntu 12.10.
>>>
>>> It give undefined reference errors for functions in libdl and libutil.
>>> For some reason, ld won't cooperate unless you pass -ldl -lutil at the
>>> end of the command string. Holy Ubuntu!
>>>
>>> I can't seem to get dmd to do this though. Any suggestions?
>>>
>>> I am using the beta, but apparently this is a thing with ubuntu.
>>
>> It is not uncommon to request the libraries needed to build your app.
>> Dmd passes a couple/one for phobos dependencies, but other libraries
>> need to be reqested.
>
> I am doing that.
>
> I think the problem is libpython2.7.a requires libdl and libutil, and ld
> requires -ldl and -lutil be positioned after libpython2.7.a, but dmd
> very stubbornly arranges them before libpython2.7.a in the call to gcc.


dmd -unittest -property -debug -gc  -version=Python_2_7_Or_Later -version=Python_2_6_Or_Later -version=Python_2_5_Or_Later -version=Python_2_4_Or_Later -L-ldl /usr/lib/python2.7/config/libpython2.7.a  object_.d -ofobject_.x -I../../infrastructure/  -L-ldl -L-lutil -v


dmd turns the above into:

gcc object_.o -o object_.x -g -m64 -ldl -ldl -lutil -L/usr/lib/x86_64-linux-gnu -L/usr/lib/i386-linux-gnu -Xlinker --no-warn-search-mismatch -Xlinker --export-dynamic /usr/lib/python2.7/config/libpython2.7.a -l:libphobos2.a -lpthread -lm -lrt

which fails, but


gcc object_.o -o object_.x -g -m64 -ldl -ldl -lutil -L/usr/lib/x86_64-linux-gnu -L/usr/lib/i386-linux-gnu -Xlinker --no-warn-search-mismatch -Xlinker --export-dynamic /usr/lib/python2.7/config/libpython2.7.a -l:libphobos2.a -lpthread -lm -lrt -ldl -lutil

works.

On 05/26/2013 05:18 PM, Ellery Newcomer wrote: > On 05/26/2013 08:10 AM, Ellery Newcomer wrote: >> On 05/26/2013 07:55 AM, Jesse Phillips wrote: >>> On Sunday, 26 May 2013 at 05:01:10 UTC, Ellery Newcomer wrote: >>>> I have a project here which fails on link on ubuntu 12.10. >>>> >>>> It give undefined reference errors for functions in libdl and libutil. >>>> For some reason, ld won't cooperate unless you pass -ldl -lutil at the >>>> end of the command string. Holy Ubuntu! >>>> >>>> I can't seem to get dmd to do this though. Any suggestions? >>>> >>>> I am using the beta, but apparently this is a thing with ubuntu. >>> >>> It is not uncommon to request the libraries needed to build your app. >>> Dmd passes a couple/one for phobos dependencies, but other libraries >>> need to be reqested. >> >> I am doing that. >> >> I think the problem is libpython2.7.a requires libdl and libutil, and ld >> requires -ldl and -lutil be positioned after libpython2.7.a, but dmd >> very stubbornly arranges them before libpython2.7.a in the call to gcc. > > > dmd -unittest -property -debug -gc -version=Python_2_7_Or_Later > -version=Python_2_6_Or_Later -version=Python_2_5_Or_Later > -version=Python_2_4_Or_Later -L-ldl > /usr/lib/python2.7/config/libpython2.7.a object_.d -ofobject_.x > -I../../infrastructure/ -L-ldl -L-lutil -v Try prefixing the python lib with -L like so: dmd -unittest -property -debug -gc -version=Python_2_7_Or_Later -version=Python_2_6_Or_Later -version=Python_2_5_Or_Later -version=Python_2_4_Or_Later -L-ldl -L/usr/lib/python2.7/config/libpython2.7.a object_.d -ofobject_.x -I../../infrastructure/ -L-ldl -L-lutil -v -- Mike Wey

On Sunday, 26 May 2013 at 16:28:33 UTC, Mike Wey wrote: > > Try prefixing the python lib with -L like so: > > dmd -unittest -property -debug -gc -version=Python_2_7_Or_Later -version=Python_2_6_Or_Later -version=Python_2_5_Or_Later -version=Python_2_4_Or_Later -L-ldl -L/usr/lib/python2.7/config/libpython2.7.a object_.d -ofobject_.x -I../../infrastructure/ -L-ldl -L-lutil -v Hey, that worked! now go report that to issue 7044 :)

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