[PATCH] c/66516 - missing diagnostic on taking the address of a builtin function

[Martin Sebor]

Attached is a rewrite of the patch to enforce that GCC builtin
functions with no library equivalents are only used to make
calls or cast to void (or in sizeof and _Alignof expressions
as a GCC extension). This version of the patch also addresses
the requests made in responses to the first patch.

Bootstrapped and tested on x86_64-unknown-linux-gnu.

Martin
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