[boost] Re: Spirit requires C++23 for questionable reasons

Alexander Grund wrote:

I also don't see any machine-readable statement of the required C++ standard. The README says C++23 & 26 but the meta-json and compile-requirements in the build files haven't been updated.

That's because boostorg/spirit holds three libraries, one of which requires C++03, the other I'm not sure what, and the third (X3, the one under discussion) used to require C++17. We're discussing how to split these three into their own repositories in https://github.com/boostorg/spirit/issues/795 but you should know that because it's your issue. :-)