Public bug reported:
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)
** Affects: gcc-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug bionic
** Attachment added: "to_string.sh"
https://bugs.launchpad.net/bugs/1832132/+attachment/5269747/+files/to_string.sh
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https://bugs.launchpad.net/bugs/1832132
Title:
incorrect results for g++ -std=c++11 -O3 -DNDEBUG
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