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From: "gnu.ojxq8 at dralias dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/114753] New: from_chars aborts with -m32 -ftrapv when
 passed -9223372036854775808
Date: Wed, 17 Apr 2024 10:30:47 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114753

            Bug ID: 114753
           Summary: from_chars aborts with -m32 -ftrapv when passed
                    -9223372036854775808
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gnu.ojxq8 at dralias dot com
  Target Milestone: ---

std::from_chars may abort when used with -m32 -ftrapv on some values.

Without -m32, or without -ftrapv, or using clang, the code works correctly.

To reproduce:

$ cat a.cpp=20
#include <charconv>
#include <cstdint>
#include <string_view>
int main() {
  int64_t result{};
  std::string_view str{"-9223372036854775808"};
  (void)std::from_chars(str.begin(), str.end(), result);
  return result !=3D -9223372036854775807 - 1;
}


$  g++ -m32 -ftrapv -std=3Dc++17 ./a.cpp && ./a.out=20
Aborted (core dumped)=