Yes, this keyword is no longer valid starting from C++17:
    https://en.cppreference.com/w/cpp/keyword/register

I realize that the "why" probably doesn't help you move forth with your problem, so here are a couple suggestions how to get over it:

• Build Boost in C++14 mode with -std=c++14
  
• Cut out "register" from the Boost source and rebuild
• Try a newer Boost version, it may have been fixed

Oleg.

On 2018-12-23 09:26, Craig Topper via cfe-dev wrote:

This seems a better question for cfe-dev or cfe-users

~Craig

On Sat, Dec 22, 2018 at 12:23 PM Osman Zakir via llvm-dev <llvm-dev@lists.llvm.org> wrote:

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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