[Bug c++/106098] New: error message that uses ANSI codes that can cause characters to disappear

[Bug c++/106098] New: error message that uses ANSI codes that can cause characters to disappear

[jonathan.poelen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106098

            Bug ID: 106098
           Summary: error message that uses ANSI codes that can cause
                    characters to disappear
           Product: gcc
           Version: 12.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jonathan.poelen at gmail dot com
  Target Milestone: ---

Created attachment 53204
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53204&action=edit
comparison between a 106 and 127 column terminal

int main() {
  char const* b = "" + "";
}

$ g++ -fdiagnostics-color=always test.cpp
test.cpp: In function ‘int main()’:
test.cpp:2:22: error: invalid operands of types ‘const char [1]’ and ‘const
char [1]’ to binary ‘operator ’
[...]

On a terminal of 106 characters per line, the `+` sign disappeared. This is due
to the use of the ANSI code \x1b[K which normally removes the characters to the
right of the cursor. However, many terminals make the last character of the
line disappear when this code is used at the end of the line. This is the case
here with a 106 column terminal ($COLUMNS=106).

I don't know why \x1b[K is used, but as far as I can see, it is useless.

[Bug c++/106098] error message that uses ANSI codes that can cause characters to disappear

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106098

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
What terminal are you using?

[Bug c++/106098] error message that uses ANSI codes that can cause characters to disappear

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106098

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |DUPLICATE

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 90411.

*** This bug has been marked as a duplicate of bug 90411 ***

[Bug c++/106098] error message that uses ANSI codes that can cause characters to disappear

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106098

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> What terminal are you using?

Basically some terminals implement this differently and maybe even incorrectly.
See the other (still open) bug report for more details on this and even on the
some of the terminals emulations and such.