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From: "kargl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/113412] New: ATAN(Y,X) does not check arguments and
 generates wrong error message.
Date: Tue, 16 Jan 2024 02:13:13 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 13.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113412

            Bug ID: 113412
           Summary: ATAN(Y,X) does not check arguments and generates wrong
                    error message.
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kargl at gcc dot gnu.org
  Target Milestone: ---

Fortran 2008 added the misguided form ATAN(Y,X) where Y could be missing.
However, if Y is present, then X is required to have the same type and
kind as Y.

Consider,

% cat a.f90
program main
   real(4) x
   real(8) y
   x =3D 1.
   y =3D x
   print*, atan(y,x), atan2(y,x)
end


% gfcx -o z a.f90
a.f90:6:10:

    6 |    print*, atan(y,x), atan2(y,x)
      |          1
Error: Too many arguments in call to =E2=80=98atan=E2=80=99 at (1)
a.f90:6:30:

    6 |    print*, atan(y,x), atan2(y,x)
      |                              1
Error: =E2=80=98x=E2=80=99 argument of =E2=80=98atan2=E2=80=99 intrinsic at=
 (1) must be the same type
and kind as =E2=80=98y=E2=80=99

The error message for atan(y,x) is wrong.=