. I am proposing to replace b2.
While I can agree that b2 isn't particularly good build system by any stretch of imagination There was a long and yet incomplete effort of moving to CMake that most around there are familiar with. CMake works very well and is very well supported all around. Replacing one not-so-good homebrew system that was at least polished with yet another homebrew system is a horrible idea. Boost needs _less_ of "non-invented-here-syndrome": not _more_ of it Refrasing Stroustrup there are two types of build systems - everybody complains about and nobody uses, and cmake is one everybody is complaining about ;-)
I mean today CMake is the most common industry standard build system
that works really well. Why would you want to use it over something like this?
CMake can not support C++20 header-units. One benefit that I forgot is that once you have compiled your project with header-units in HMake and you want to move to C++20 modules,
It seems like a feature gap that can be fixed at CMake level - either by cmake developers or by external patch. Have you considered talking with CMake developers about it and/or submitting a patch? What do they think about this? I'm sure they are aware of the problem :-)
By caching the results and not running tests every time. Also, configure.exe uses the same code that is used by build.exe. It is fully parallel as well.
You don't reconfigure each and every build... cmake caches _a lot_ sorry but it seems to be a false statement. Best Artyom