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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.lang.c
Subject: Re: errno (was Re: C23 thoughts and opinions - why so conservative?)
Date: Tue, 28 May 2024 02:48:28 -0000 (UTC)
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On Sun, 26 May 2024 18:12:17 +0200, David Brown wrote:

> Macros in C are not recursive. That stops them exploding, but also means
> there's a lot you can't do with the preprocessor.

String-based macros + recursive substitution = recipe for trouble.