[Bug 1832132] Re: incorrect results for g++ -std=c++11 -O3 -DNDEBUG

[Bradley Bell]

It turns out it was an error in my test; see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98151

** Bug watch added: GCC Bugzilla #98151
   https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98151

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https://bugs.launchpad.net/bugs/1832132

Title:
  incorrect results for g++ -std=c++11 -O3 -DNDEBUG

Status in gcc-defaults package in Ubuntu:
  New

Bug description:
  This bug report is a simplification of the following issue reported against CppAD:
  https://github.com/coin-or/CppAD/issues/44

  The attached file (to_string.sh) is a bash script that demonstrates
  the problem.

  In summary (of running to_string.sh) the following source code has a different result for ok
  depending on if PRINT_BEFOR_CHECK is 0 or 1.

      int max        = std::numeric_limits<int>::max();
      os             << max;
      std::string s  = os.str();
      int check      = string2int(s);
  # if PRINT_BEFORE_CHECK
      std::cout << "max = " << max << ", check = " << check << "\n";
  # endif
      ok            &= max == check;

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: g++ 4:7.4.0-1ubuntu2.2
  ProcVersionSignature: Ubuntu 4.15.0-51.55-generic 4.15.18
  Uname: Linux 4.15.0-51-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.6
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Jun  9 07:58:29 2019
  InstallationDate: Installed on 2018-10-24 (227 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  SourcePackage: gcc-defaults
  UpgradeStatus: No upgrade log present (probably fresh install)

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