[FTR, I'm the one who encouraged Jonathan to file a bug.  Mount 
flags seem ideally suited to build-time validation.]

Maxim,

Maxim Cournoyer 写道：
> each file system may have their own flags

Really?  Huh.  Interesting.  How does that work?  Where would 
these file-system specific flags be #defined?

(My guess is that if anyone does this, it'd be ZFS ;-)

> add new flags with new [Linux] releases

Well, sure, but then we simply add them to Guix.  This applies to 
everything from syscalls to services.

Ludo', I'll take a look at ‘sanitize’; thanks!

Kind regards,

T G-R