Public bug reported:
Calling regex_replace with -O3 will crash no matter the input. This
seems to have started occurring after an apt-get upgrade, but I cannot
say for sure exactly what package update might have caused it. We were
able to run similar code in previous builds of 16.04.
If you compile without -O3, it runs.
clang++ --std=c++14 -O3 test.cpp
test.cpp:
#include <regex>
#include <string>
#include <iostream>
int main() {
const std::string& output = regex_replace("", std::regex(""), "");
std::cout << output << "\n";
return 0;
}
Description: Ubuntu 16.04.3 LTS
Release: 16.04
clang:
Installed: 1:3.8-33ubuntu3.1
Candidate: 1:3.8-33ubuntu3.1
Version table:
*** 1:3.8-33ubuntu3.1 500
500 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64
Packages
100 /var/lib/dpkg/status
1:3.8-33ubuntu3 500
500 http://us.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: clang 1:3.8-33ubuntu3.1
ProcVersionSignature: Ubuntu 4.13.0-32.35~16.04.1-generic 4.13.13
Uname: Linux 4.13.0-32-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Feb 8 20:23:48 2018
InstallationDate: Installed on 2017-08-17 (175 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcEnviron:
LANGUAGE=en_US
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: llvm-defaults
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: llvm-defaults (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug xenial
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https://bugs.launchpad.net/bugs/1748344
Title:
clang++ regex_replace always segfaults with -O3
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