https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #16 from Desmond Rhodes ---
(In reply to Andrew Pinski from comment #10)
> Again there is no bug in libstdc++. The bug is you are enabling an
> questionable clang option that breaks well defined c++ code.
I'm sorry, I've done some
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #17 from Desmond Rhodes ---
Anyway, I've found a way to disable UBSan `-fsanitize=integer` for the
libstd++.
If I make the file `ignorelist.txt`:
```
#!special-case-list-v1
[integer]
# src:.*gcc.*include.*c\+\+.*
```
And then co
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #15 from Desmond Rhodes ---
(In reply to Jonathan Wakely from comment #11)
> Clang documents how to silence these diagnostics, which are NOT undefined
> behaviour.
>
> The conversion to size_t is 100% portable and well defined by t
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #20 from Desmond Rhodes ---
(In reply to Desmond Rhodes from comment #17)
> Anyway, I've found a way to disable UBSan `-fsanitize=integer` for the
> libstd++.
>
> If I make the file `ignorelist.txt`:
>
> ```
> #!special-case-list-v
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #18 from Desmond Rhodes ---
My issue is solved. Please close this ticket. Also, please let others who might
encounter a similar problem in the future of this fix.
Thank you for being patient with me. It only took me 3 days, 2 nights
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #9 from Desmond Rhodes ---
Just as a side note, I've never encountered `UndefinedBehaviorSanitizer`
triggered by the standard library before. It's only recently with the C++20 and
C++23 standards new features that are turning on all
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #7 from Desmond Rhodes ---
(In reply to Andrew Pinski from comment #4)
> See PR 91547 also.
>
> Basically clang's -fsanitize=integer is useless for well defined C/C++ code
> and should NOT be used unless you how to filter out the ba
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #6 from Desmond Rhodes ---
(In reply to Andrew Pinski from comment #3)
> See PR 97844 also for other places where -fsanitize=integer produces bad
> results with libstdc++ and already declared as not going to be dealt with.
>
> *** T
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
--- Comment #5 from Desmond Rhodes ---
(In reply to Andrew Pinski from comment #1)
> Since this is well defined this is not a bug. The bug is clang allows
> reporting of this and saying it is undefined. Basically -fsanitize=integer
> is broken a
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119429
Bug ID: 119429
Summary: size_t __nargs = -1 in std::format
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
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