https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86274
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |6.4.0
Keywords| |wrong-code
Last reconfirmed| |2018-06-25
Component|libstdc++ |ipa
CC| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
Summary|SEGFAULT when logging |[7/8/9 Regression] SEGFAULT
|std::to_string(NAN) |when logging
| |std::to_string(NAN)
Known to fail| |6.4.0, 7.3.0, 8.1.0, 9.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Filip Matzner from comment #0)
> 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());
There's no crash if BOOST_LOG_TRIVIAL(info) is replaced with std::cout, which
suggests there's nothing wrong with the std::to_string code or the std::string
constructor.
It crashes with either the old or new std:string code. Either way, it crashes
when calling __builtin_mcmcpy
> }
>
>
> 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.
It crashes with -O2 -fipa-cp-clone
Compiled with GCC 6 it doesn't crash. Compiled with GCC 7.1+ it crashes.
Preprocessed with GCC 6 and compiled with GCC 7+ it crashes.
