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From: "zeccav at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libfortran/81986] sanitizer detects negation of large number in
 string.c
Date: Sat, 27 Feb 2021 09:21:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D81986

Vittorio Zecca <zeccav at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|sanitizer                   |libfortran

--- Comment #4 from Vittorio Zecca <zeccav at gmail dot com> ---
On current trunk with sanitized libgfortran.so.5 I get

gfortran gfbug142.f
ldd ./a.out
        ........
        libgfortran.so.5 =3D>
/home/vitti/gcc-150221-undefined/x86_64-pc-linux-gnu/libgfortran/.libs/libg=
fortran.so.5
(0x000014a739133000)
        libubsan.so.1 =3D>
/home/vitti/local/gcc-150221-undefined/lib/../lib64/libubsan.so.1
(0x000014a738293000)
        libstdc++.so.6 =3D>
/home/vitti/local/gcc-150221-undefined/lib/../lib64/libstdc++.so.6
        ................

./a.out
../../../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
80000000000000000000000000000000=