Re: coreutils/gnulib - fts.c dangling pointers & gcc 13.1

[Sam James]

> On 4 Feb 2023, at 20:20, Paul Eggert <eggert@cs.ucla.edu> wrote:
> 
> On 2023-02-04 11:53, Sam James wrote:
>> I'd consider using #pragma GCC ... to suppress -Wuse-after-free
>> for the "problematic" lines instead. It'd avoid the risk of either 
>> optimisations or sanitisers
>> respectively causing us pain in future.
> 
> I don't see why that pragma would avoid those problems. All it would do is 
> shut off the warnings; GCC's underlying analyses would be the same, and GCC 
> would generate the same machine code. In that sense these warnings are useful 
> - they're canaries in the coal mine.

I guess it's hard for me to say given I don't know what options allowed it to 
be reproduced and I couldn't hit it.

I assumed it must have been -Wstrict-aliasing=2 or lower which makes it more 
aggressive at the risk of false positives.

But if you reproduced it, then it's useful, I suppose.

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