LLVM 7.0.0 and up is crashing

[steven-varga]

A recent error report by @mrj10 motivated to check compiler compatibility, and as it turns out the LLVM based Clang toolchain is crashing while parsing the C++ templates.
The workaround is to use gcc 7.4.0, gcc 8.3.0, gcc 9.0.1 or clang 6.0.0 until the problem is located and fixed.

Error report: clang_9.0.1-error.tar.gz