[Bug web/114496] New: Documentation: "Non-Bugs" page should update/mention something about -Wsign-conversion

[Bug web/114496] New: Documentation: "Non-Bugs" page should update/mention something about -Wsign-conversion

[Explorer09 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114496

            Bug ID: 114496
           Summary: Documentation: "Non-Bugs" page should update/mention
                    something about -Wsign-conversion
           Product: gcc
           Version: 13.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: web
          Assignee: unassigned at gcc dot gnu.org
          Reporter: Explorer09 at gmail dot com
  Target Milestone: ---

Section 14.8 of GCC manual
"Certain Changes We Don’t Want to Make"
(https://gcc.gnu.org/onlinedocs/gcc-13.2.0/gcc/Non-bugs.html)

This item:

> Warning about assigning a signed value to an unsigned variable.
> Such assignments must be very common; warning about them would cause more annoyance than good.

Perhaps GCC should clarify this a bit. GCC now has the "-Wsign-conversion"
option that warns about similar signed-to-unsigned conversions. So what feature
in particular did GCC choose not to implement? The difference between this
"non-bug" item and the existing "-Wsign-conversion" is what I wish to see.

[Bug other/114496] Documentation: "Non-Bugs" page should update/mention something about -Wsign-conversion

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114496

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

[Bug other/114496] Documentation: "Non-Bugs" page should update/mention something about -Wsign-conversion

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114496

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2024-03-27
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
.

[Bug other/114496] Documentation: "Non-Bugs" page should update/mention something about -Wsign-conversion

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114496

--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Maybe the update could be just to clarify the "EnabledBy" rules for the
warning? i.e., something like "-Wsign-conversion is only and will only ever be
enabled by -Wconversion in C, and we will never have it enabled by -Wall or
-Wextra (unlike -Wsign-compare, which is enabled by -Wall in C++, and -Wextra
in C)."
(and maybe also include something about the new -Warith-conversion flag too?)