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

[Osman Zakir via cfe-users]

When I tried to build Boost with LLVM, I got the error mentioned in the title: "error: ISO C++17 does not allow 'register' storage class specifier [-Wregister]".  I've attached the project-config.jam file I used.  And I've also sent an email to the Boost users mailing list about this.

Anyway, if possible, someone help would be appreciated.  How do I fix this problem?  Thanks in advance.
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