AW: [odb-users] gcc 13.2: vector.ixx: warning: ‘i’ may be used uninitialized

[Siegmund, Harald]

Unfortunately the const doesn't make the warning go away.

I set up a small reproducer with Compiler Explorer for playing with this issue:
https://godbolt.org/z/7rhxTfqMf

It seems that several things have to come together to trigger the false warning. See the comments in the code. This strongly looks like a gcc bug. Clang stays silent.


-----Ursprüngliche Nachricht-----
Von: Boris Kolpackov <boris at codesynthesis.com> 
Gesendet: Dienstag, 10. September 2024 10:26
An: Siegmund, Harald <Harald.Siegmund at isotravel.com>
Cc: odb-users at codesynthesis.com
Betreff: Re: [odb-users] gcc 13.2: vector.ixx: warning: ‘i’ may be used uninitialized

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Siegmund, Harald <Harald.Siegmund at isotravel.com> writes:

> The compiler is quiet now with -O0 but still complains with -O3. This 
> is clearly a gcc issue.

Hm, interesting. Maybe it thinks the non-inline call may change the local variable? Can you change the first line to read:

const bool t (_tracking ());

And see if that helps?