[llvm-dev] Error: ISO C++17 does not allow 'register' storage class specifier [-Wregister], when building Boost 1.69.0

[Osman Zakir via llvm-dev]

When trying to build Boost using LLVM, I had this error:
"
error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
"
I attached the project-config.jam file I used to this message.  Someone please help me out (if there's someone on here who can).
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