https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86274
Bug ID: 86274
Summary: SEGFAULT when logging std::to_string(NAN)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: floop at floop dot cz
Target Milestone: ---
Originally reported here: https://svn.boost.org/trac10/ticket/13611, but Boost
developers claim the problem is probably in the compiler, not Boost.
Consider the following code:
#include <climits>
#include <boost/log/trivial.hpp>
int main()
{
BOOST_LOG_TRIVIAL(info)
<< std::to_string(std::numeric_limits<double>::quiet_NaN());
}
When compiled with the following command:
g++ -std=c++17 -DBOOST_ALL_DYN_LINK -pthread -lboost_log -O3 test.cpp
It crashes with SEGFAULT in std::string constructor:
#0 0x0000555555556221 in std::char_traits<char>::copy (__n=3,
__s2=0x7fffffffd4e0 "nan", __s1=<optimized out>) at
/usr/include/c++/7/bits/char_traits.h:350
Note that the SEGFAULT does not happen with -O2, but only -O3. Clang does not
seem to be affected.
System info:
[floop@pine /tmp ]$ g++ -v
...
gcc version 8.1.1 20180531 (GCC)
[floop@pine /tmp ]$ uname -a
Linux pine 4.16.13-2-ARCH #1 SMP PREEMPT Fri Jun 1 18:46:11 UTC 2018 x86_64
GNU/Linux
Others have been able to reproduce this with gcc 7.3 (see the bug report on
https://svn.boost.org/trac10/ticket/13611).
Thank you for your help and have a great day!
