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From: "jonathan.poelen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/106098] New: error message that uses ANSI codes that can
 cause characters to disappear
Date: Mon, 27 Jun 2022 01:48:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106098

            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=3D53204&action=3Dedit
comparison between a 106 and 127 column terminal

int main() {
  char const* b =3D "" + "";
}

$ g++ -fdiagnostics-color=3Dalways test.cpp
test.cpp: In function =E2=80=98int main()=E2=80=99:
test.cpp:2:22: error: invalid operands of types =E2=80=98const char [1]=E2=
=80=99 and =E2=80=98const
char [1]=E2=80=99 to binary =E2=80=98operator =E2=80=99
[...]

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 c=
ase
here with a 106 column terminal ($COLUMNS=3D106).

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