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Re:Proposal to add constexpr to C [pdf] by pjmlp on Saturday October 16, 2021 @06:27AM (#28886861)
It can, check the C++ compiler Circle.

https://www.circle-lang.org

Unfortunately it isn't a direction WG21 is willing to adopt.

Re:Proposal to add constexpr to C [pdf] by wtetzner on Saturday October 16, 2021 @09:49AM (#28887865)
I just assumed the constexpr keyword was added to help the programmer ensure that what they were writing could be run at compile time.