Julia 1.4 library compatibility problem on Linux.

[rbehrends]

When I try to use Polymake.jl with Julia 1.4 on Linux, I get the following error:

julia> using Polymake
   [ Info: Precompiling Polymake [d720cf60-89b5-51f5-aff5-213f193123e7]
   ERROR: LoadError: could not load library "/home/behrends/.julia/packages/Polymake/kIMyn/src/../deps/src/libpolymake.so"
   /home/behrends/julia-1.4.0/bin/../lib/julia/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by /home/behrends/.julia/packages/Polymake/kIMyn/src/../deps/src/libpolymake.so)
   Stacktrace:
    [1] dlopen(::String, ::UInt32; throw_error::Bool) at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.4/Libdl/src/Libdl.jl:109
    [2] dlopen at /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.4/Libdl/src/Libdl.jl:109 [inlined]
    [3] readmodule(::String, ::Symbol, ::Module, ::Nothing) at /home/behrends/.julia/packages/CxxWrap/lDNAy/src/CxxWrap.jl:663
    [4] wrapmodule(::String, ::Symbol, ::Module, ::Nothing) at /home/behrends/.julia/packages/CxxWrap/lDNAy/src/CxxWrap.jl:670
    [5] top-level scope at /home/behrends/.julia/packages/Polymake/kIMyn/src/Polymake.jl:41
    [6] include(::Module, ::String) at ./Base.jl:377
    [7] top-level scope at none:2
    [8] eval at ./boot.jl:331 [inlined]
    [9] eval(::Expr) at ./client.jl:449
    [10] top-level scope at ./none:3
   in expression starting at /home/behrends/.julia/packages/Polymake/kIMyn/src/Polymake.jl:41
   ERROR: Failed to precompile Polymake [d720cf60-89b5-51f5-aff5-213f193123e7] to /home/behrends/.julia/compiled/v1.4/Polymake/QizyK_3MmYl.ji.
   Stacktrace:
    [1] error(::String) at ./error.jl:33
    [2] compilecache(::Base.PkgId, ::String) at ./loading.jl:1272
    [3] _require(::Base.PkgId) at ./loading.jl:1029
    [4] require(::Base.PkgId) at ./loading.jl:927
    [5] require(::Module, ::Symbol) at ./loading.jl:922

The libstdc++.so.6 library is included as part of the standard Julia distribution and there seems to be a version conflict here that may come from it overriding the system libstdc++.

This problem does not occur on macOS.

[kalmarek]

this is known; try
mv ~/julia-1.4.0/julia/libstdc++.so.6 ~/julia-1.4.0/julia/libstdc++.so.6.orig
so that julia uses systems libstdc++

see also JuliaLang/julia#34276

[kalmarek]

this should be fixed by #252