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

[Rob Latham]

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?
>
>
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-- 
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA