[Bug c++/111516] New: parameter passing note is not actionable

[Bug c++/111516] New: parameter passing note is not actionable

[gonzalo.gadeschi at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111516

            Bug ID: 111516
           Summary: parameter passing note is not actionable
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gonzalo.gadeschi at gmail dot com
  Target Milestone: ---

I'm getting the following note (no reproducer yet), which as far as I can tell,
does not really tell me anything actionable and does not mention how to silence
it: 

```
/usr/include/c++/12/bits/stl_pair.h:741:5: note: parameter passing for argument
of type 'std::pair<double, double>' when C++17 is enabled changed to match
C++14 in GCC 10.1
  741 |     make_pair(_T1&& __x, _T2&& __y)
      |     ^~~~~~~~~
```


This note should at least be silenceable. 

It would be nice if the note message were to say something actionable, e.g.,
explain why this is a problem and what to do about it.

My interpretation of the note is that it is suggesting the developer to stop
using C++17 and to use C++14 instead. If this is not the intent, then it would
be great if the note could be clarified.

[Bug c++/111516] parameter passing note is not actionable

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111516

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |diagnostic

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
That's definitely not what it's suggesting. It's telling you that the ABI for
c++17 code in gcc 10 does not match the ABI for c++17 code in gcc 9. It's a
statement of fact, it's not suggesting that you do anything. I agree that it
isn't necessarily useful, because you might not care about the ABI of c++17
code in gcc 9.

Have you tried -Wno-psabi ?