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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114753] from_chars aborts with -m32 -ftrapv when passed
 -9223372036854775808
Date: Wed, 17 Apr 2024 10:49:29 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114753

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> With __val =3D 9223372036854775808LL __sign =3D -1LL

Oops, that should be __val =3D 9223372036854775808ULL and __sign =3D -1

i.e.

int main()
{
  unsigned long long val =3D 9223372036854775808ULL;
  int sign =3D -1;
  long long res;
  return __builtin_mul_overflow(val, sign, &res);
}

This shouldn't trap.=