Compiling Rust with GCC: an update

If I were the gccrs developers, I'd probably describe it as "1.49 with additional implemented features". Or, more succinctly, "see our issue tracking for specifics because we are still under heavy development".

> Users will simplify that in their head to a single version number, and possibly write an optimistic MSRV to Cargo.toml.

Users will do awful things. What do you suppose anyone do about it?

> it's normal for gccrs to want to release features without exactly following rustc's release history,

Yeah, railroading any implementation to limitations such as "you cannot make stdlib function X const before you implement $complicated_compiler_feature that took rustc developer 5 years to do" is…really strict and basically saying "none may pass"-style goalposts along this road.

> but as a user I yearn for a simple "gccrs version X matches the features of rustc version Y".

I sympathize, but I've also been in this field long enough to know that such things are usually hiding Lovecraftian contortions to make such a facade.