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From: "zeccav at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libfortran/99191] New: sanitizer detects undefined behaviour in
 libgfortran
Date: Mon, 22 Feb 2021 09:21:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99191

            Bug ID: 99191
           Summary: sanitizer detects undefined behaviour in libgfortran
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libfortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zeccav at gmail dot com
  Target Milestone: ---

! from pr66311.f90
! must be compiled and run with sanitized libgfortran
!../../../gcc-150221/libgfortran/io/write.c:835:7: runtime error: negation =
of
0x80000000000000000000000000000000 cannot be represented in type '__int128';
cast to an unsigned type to negate this value to itself
!../../../gcc-150221/libgfortran/runtime/string.c:199:11: runtime error:
negation of 0x80000000000000000000000000000000 cannot be represented in type
'__int128'; cast to an unsigned type to negate this value to itself
      use iso_fortran_env, only : ikinds =3D> integer_kinds

      integer, parameter :: k =3D ikinds(size(ikinds))

      write(*,*) -huge(0_k)-1

      end=