On Tue, 10 Nov 2020 at 11:56, Sandro Mani <manisan...@gmail.com> wrote:

/usr/bin/ld:
> CMakeFiles/vtkIOXMLCxxTests.dir/TestXMLHyperTreeGridIO.cxx.o (symbol
> from plugin): undefined reference to symbol
> '_ZZNSt8__detail18__to_chars_10_implIjEEvPcjT_E8__digits@@LLVM_11'
> /usr/bin/ld: /usr/lib64/libLLVM-11.so: error adding symbols: DSO missing
> from command line
>
...

> I'm not sure why ld thinks LLVM is involved, vtk does not pull in LLVM
> in any way.
>
> I'm pretty much clueless, any ideas?
>

That looks like the object file requires a symbol from libLLVM, and gcc
isn't linking against it (hence the "DSO missing from command line" part).

If you have a log of the whole build you should be able to check how that
object (the test) is being built; LLVM suggests maybe it was built using
clang?
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