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From: "ubizjak at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/110957] New: -ffpe-trap and -ffpe-summary options
 issues
Date: Wed, 09 Aug 2023 09:28:41 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 14.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: ubizjak at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110957

            Bug ID: 110957
           Summary: -ffpe-trap and -ffpe-summary options issues
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ubizjak at gmail dot com
  Target Milestone: ---

A couple of issues with -ffpe-trap and -ffpe-summary options:

a) Invalid argument report should be switched:

$ gfortran -ffpe-summary=3Daaa ac.f90
f951: Fatal Error: Argument to =E2=80=98-ffpe-trap=E2=80=99 is not valid: a=
aa
compilation terminated.

$ gfortran -ffpe-trap=3Daaa ac.f90
f951: Fatal Error: Argument to =E2=80=98-ffpe-summary=E2=80=99 is not valid=
: aaa
compilation terminated.


b) Specifying also -fno-trapping-math should be detected and handled

$ gfortran -ffpe-trap=3Dinvalid -fno-trapping-math ac.f90
[no diagnostics]

The issue b) should either report incompatibility between options, or force
-ftrapping-math (probably with a warning). Ideally, -ffpe-* should always s=
et
flag_trapping_math, in case the compiler switches to no trapping math by
default in future.=