> I thought I would try to see if Sage builds in the upcoming version of
> Ubuntu, which is still early in the development stages but I think the
> compilers and other basic system stuff are stable. But there's some kind
> of linker error:
>
> ../kernel/libkernel.a(mod_raw.o): In function `dynl_open':
> /home/foo/sage-4.6.2.alpha4/spkg/build/singular-3-1-1-4.p3/src/kernel/mod_r
> aw.cc:217: undefined reference to `dlopen'
> ../kernel/libkernel.a(mod_raw.o): In function `dynl_sym':
> /home/foo/sage-4.6.2.alpha4/spkg/build/singular-3-1-1-4.p3/src/kernel/mod_r
> aw.cc:228: undefined reference to `dlsym' ../kernel/libkernel.a(mod_raw.o):
> In function `dynl_close':
> /home/foo/sage-4.6.2.alpha4/spkg/build/singular-3-1-1-4.p3/src/kernel/mod_r
> aw.cc:233: undefined reference to `dlclose'
> ../kernel/libkernel.a(mod_raw.o): In function `dynl_error':
> /home/foo/sage-4.6.2.alpha4/spkg/build/singular-3-1-1-4.p3/src/kernel/mod_r
> aw.cc:238: undefined reference to `dlerror' collect2: ld returned 1 exit
> status
>
> (Full build log attached.)
>
> This seems like a pretty basic linking / libc problem:
> http://www.linuxquestions.org/questions/slackware-14/undefined-reference-to
> -dlopen-dlclose-dlsym-and-dlerror-350945/.
>
> I tried to continue the build without Singular just to see what else
> worked, and also got a linker error there too -- with symmetrica, it
> eventually failed with "undefined reference to `cos'"!
>
> The build system is a current Ubuntu Natty (11.04) 32-bit virtual
> machine. Any ideas on what's going wrong? Is this an Ubuntu problem that
> will get fixed before the final release, or something we need to work
> on? (Or something silly on my part?)
>
Hi
I don't think you are doing anything silly it is just plain weird. In singular
you have "-ldl" on the compilation line which should have the stuff in
question. So is /usr/lib/libdl.{a,so} on your system?
What about /usr/lib/libm.{a,so}?
I think it is weird it doesn't fail because of libm before symmetrica.
Can you provide a list of package that build before singular?
Francois
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