The CompCert compiler is not under the GPL or LGPL, it is under a proprietary license. Some parts may be released with other licenses, but that is different.
That's not the point going down this thread. If part of it is GPL (and not LGPL), it makes it impossible to release compiled binaries made with it that are not GPL. It appears they attempted to switch to LGPL to fix that two months ago[1], but perhaps missed some parts.
[1] https://github.com/AbsInt/CompCert/commit/04f499c632a76e4605...
Right. It's about a compiler with a GPL license but without a similar exception. I was making a comparison.