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From: James Kuyper <jameskuyper@alumni.caltech.edu>
Newsgroups: comp.lang.c
Subject: Re: __func__ is not a keyword
Date: Sun, 16 Mar 2025 16:35:36 -0400
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On 3/16/25 15:05, Kaz Kylheku wrote:
> On 2025-03-16, Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:
....
>> It's not a conformance issue, since __func__ is a reserved identifier
>> and any code that can tell whether it's a keyword has undefined
>> behavior.
> 
> But __func__ is not a reserved identifier!

Footnote 79 disagrees: "79) Since the name __func__ is reserved for any
use by the implementation (7.1.3), if any other identifier is explicitly
declared using the name __func__, the behavior is undefined."

Actually, I don't see how 7.1.3 applies. I think the conclusion is
correct, but the relevant citation should be 6.2.4.1p7: "All identifiers
that begin with a double underscore (__) ... are reserved for any use.
....". That wording used to be in 7.1.3. That wording was moved from
7.3.1 in n2573.pdf (2020-10-01) to 6.2.4.1 in n2596.pdf (2020-12-11).