[Bug libstdc++/66359] Regex Fails to match

["georg at schorsch-tech dot de" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66359

--- Comment #3 from georg@schorsch-tech.de ---
I tried to apply that revision to gcc-4.9.2. Now i get the following error.

g++ -DUSE_STD -std=c++11 main.cpp 
In file included from
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2/include/g++-v4/regex:58:0,
                 from main.cpp:2:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2/include/g++-v4/bits/regex.h:65:5:
warning: inline function 'std::shared_ptr<std::__detail::_NFA<_TraitsT> >
std::__detail::__compile_nfa(const typename _TraitsT::char_type*, const
typename _TraitsT::char_type*, const _TraitsT&,
std::regex_constants::syntax_option_type) [with _TraitsT =
std::regex_traits<char>; typename _TraitsT::char_type = char]' used but never
defined
     __compile_nfa(const typename _TraitsT::char_type* __first,
     ^
/tmp/ccMywN21.o: In function `std::basic_regex<char, std::regex_traits<char>
>::basic_regex<char const*>(char const*, char const*,
std::regex_constants::syntax_option_type)':
main.cpp:(.text._ZNSt11basic_regexIcSt12regex_traitsIcEEC2IPKcEET_S6_NSt15regex_constants18syntax_option_typeE[_ZNSt11basic_regexIcSt12regex_traitsIcEEC5IPKcEET_S6_NSt15regex_constants18syntax_option_typeE]+0xd5):
undefined reference to
`std::shared_ptr<std::__detail::_NFA<std::regex_traits<char> > >
std::__detail::__compile_nfa<std::regex_traits<char>
>(std::regex_traits<char>::char_type const*, std::regex_traits<char>::char_type
const*, std::regex_traits<char> const&,
std::regex_constants::syntax_option_type)'
collect2: error: ld returned 1 exit status


I added my applied patch too. I copied the files from your revision to my tree
and used git to create that patch.