[Llvm-bgq-discuss] Linker error: undefined reference to `vtable for std::nested_exception'

[Sandipan Mohanty]

Hi!

    The linker error Michael mentioned also appears for a simple hello world 
program:

#include <iostream>

int main()
{
    std::cout << "Hello, World!\n";
}

Compiling it with bgclang++ is fine. Compiling with bgclang++11, which also 
links with libc++, produces the linker error he mentioned about 
nested_exception. The nested_exception class members are defined inside the 
exception.cpp file in the libc++ source. But there are lots of macros 
influencing what sections get compiled. Is the libc++ in the RPM compiled with 
libsupc++, libcxxrt or libcxxabi as the LIBCXX_CXX_ABI ?

/Sandipan



On Thursday 17 Jul 2014 11:30:35 Rob Latham wrote:
> See http://www.alcf.anl.gov/user-guides/bgclang-compiler#faq, which I
> myself was just staring at last night:
> 
> Linking code compiled with bgclang++ together with code compiled with
> bgclang++11 does not work, why?
> 
> Code compiled using bgclang++ uses the same libstdc++ standard template
> library (STL) implementation as the system-default GNU
> powerpc64-bgq-linux-g++ compiler. This provides compatibility with C++
> libraries, including some system libraries, compiled with the GNU
> toolchain. This STL implementation, however, cannot provide a conforming
> C++11 programming environment, and so bgclang++11 uses an up-to-date STL
> implementation derived from LLVM's libc++. Unfortunately, this STL
> implementation is incompatible with libstdc++, and so linking errors
> will result for functions that use STL objects as part of their
> signatures (i.e. parameter or return types).
> 
> ==rob
> 
> On 07/17/2014 08:48 AM, Michael Schlottke wrote:
> > Hi Hal,
> > 
> > We tried to install the new version of clang on the BG/Q @ FZ Juelich
> > from your rpms, which worked like a breeze (thanks again for your
> > effors!). However, with the new installation we are not able to link
> > even simple problems against libcxx, as all attempts end with the
> > following error:
> > 
> > /bgsys/local/clang/r209570-20140527/libc++/lib/libc++.a(exception.cpp.o):(
> > .toc+0x0): undefined reference to `vtable for std::nested_exception'
> > clang: error: linker command failed with exit code 1 (use -v to see
> > invocation)
> > 
> > It happens as soon as we try to compile & link a dummy program that has
> > at least one std library include file. If we use bgclang++, the error
> > does not occur, but it does when using either -stdlib=libc++ or
> > bgclang++11.
> > 
> > Do you have any idea what the source of the problem could be? I attached
> > a MWE and the output of running bgclang++11 with -v.
> > 
> > Regards,
> > 
> > Michael
> > 
> > P.S.: We had a driver/toolchain upgrade on JUQUEEN and thus our old
> > clang installations are not working anymore. Maybe this could be related
> > to the problem?
> > 
> > 
> > --------------------------------------------------------------------------
> > ----------------------
> > -------------------------------------------------------------------------
> > ----------------------- Forschungszentrum Juelich GmbH
> > 52425 Juelich
> > Sitz der Gesellschaft: Juelich
> > Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498
> > Vorsitzender des Aufsichtsrats: MinDir Dr. Karl Eugen Huthmacher
> > Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),
> > Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,
> > Prof. Dr. Sebastian M. Schmidt
> > --------------------------------------------------------------------------
> > ----------------------
> > -------------------------------------------------------------------------
> > -----------------------
> > 
> > 
> > 
> > _______________________________________________
> > llvm-bgq-discuss mailing list
> > llvm-bgq-discuss at lists.alcf.anl.gov
> > https://lists.alcf.anl.gov/mailman/listinfo/llvm-bgq-discuss