Re: errno (was Re: C23 thoughts and opinions - why so conservative?)

On 5/29/2024 10:27 AM, James Kuyper wrote:

On 5/28/24 02:31, BGB wrote:

On 5/27/2024 9:48 PM, Lawrence D'Oliveiro wrote:

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.\

...

It seems the preprocessor in BGBCC is likely not entirely conformant
in this case...
>
If given a recursive macro, it will most likely just explode and
probably crash the compiler...
>
Mostly as it handles macro-expansion by looping over the line and
performing macro-substitutions until no more substitutions are seen,
at which point it emits the line to the output buffer and moves on to
the next line.

 That definitely fails to conform to the requirements in 6.10.4.4.
 

I will need to put it on my TODO list.
It has not come up yet, because if it did it will be fairly obvious (namely, in that it will crash the compiler if it did come up).
But, in terms of priority, this would be behind things like code-generation or memory corruption bugs, some of which I am also trying to hunt down at the moment (when I have time at least, at present also a lot of time is getting eaten up by my "day job", namely running a CNC machine, and jobs are baked up recently...).