Follow-up patch committed, after my use of the one-argument variant of static_assert() broke bootstrap on Solaris (sorry Rainer!). The one-arg form is new since C23, while Solaris <assert.h> only supports the two-arg form (C11).
I have confirmed that other target libraries use the two-arg form, and bootstrapped the attached patch on x86_64-pc-linux-gnu. FX
static_assert.diff
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