Why is the wrong GCC libstdc++ ABI being selected on CentOS?

I'm trying to compile a simple program with GCC 7.2.1 on CentOS 7. I installed g++ with the following command on a fresh Docker CentOS image:

$ yum install centos-release-scl-rh
$ yum install devtoolset-7-gcc-c++
$ ln -s /opt/rh/devtoolset-7/root/usr/bin/g++ /usr/local/bin/g++

Confirming the install:

$ g++ --version
$ g++ (GCC) 7.2.1 20170829 (Red Hat 7.2.1-1)

Attempting to compile the program:

// main.cpp
#include <string>
#include <iterator>
#include <algorithm>
#include <iostream>

int main()
{
    std::string foo {"hello world10m"};
    foo.erase(std::find(std::cbegin(foo), std::cend(foo), '1'), std::cend(foo));
    std::cout << foo << std::endl;
}

using the command:

$ g++ -std=gnu++14 -o test main.cpp

gives the following compiler error:

main.cpp: In function 'int main()':
main.cpp:9:79: error: no matching function for call to 'std::basic_string<char>::erase(__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>::const_iterator)'
     foo.erase(std::find(std::cbegin(foo), std::cend(foo), '1'), std::cend(foo));
                                                                               ^
In file included from /opt/rh/devtoolset-7/root/usr/include/c++/7/string:52:0,
                 from main.cpp:1:
/opt/rh/devtoolset-7/root/usr/include/c++/7/bits/basic_string.h:4476:7: note: candidate: std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::erase(std::basic_string<_CharT, _Traits, _Alloc>::size_type, std::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]
       erase(size_type __pos = 0, size_type __n = npos)
       ^~~~~
/opt/rh/devtoolset-7/root/usr/include/c++/7/bits/basic_string.h:4476:7: note:   no known conversion for argument 1 from '__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >' to 'std::basic_string<char>::size_type {aka long unsigned int}'
/opt/rh/devtoolset-7/root/usr/include/c++/7/bits/basic_string.h:4492:7: note: candidate: std::basic_string<_CharT, _Traits, _Alloc>::iterator std::basic_string<_CharT, _Traits, _Alloc>::erase(std::basic_string<_CharT, _Traits, _Alloc>::iterator) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::basic_string<_CharT, _Traits, _Alloc>::iterator = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >; typename _Alloc::rebind<_CharT>::other::pointer = char*]
       erase(iterator __position)
       ^~~~~
/opt/rh/devtoolset-7/root/usr/include/c++/7/bits/basic_string.h:4492:7: note:   candidate expects 1 argument, 2 provided
/opt/rh/devtoolset-7/root/usr/include/c++/7/bits/basic_string.h:4512:7: note: candidate: std::basic_string<_CharT, _Traits, _Alloc>::iterator std::basic_string<_CharT, _Traits, _Alloc>::erase(std::basic_string<_CharT, _Traits, _Alloc>::iterator, std::basic_string<_CharT, _Traits, _Alloc>::iterator) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::basic_string<_CharT, _Traits, _Alloc>::iterator = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >; typename _Alloc::rebind<_CharT>::other::pointer = char*]
       erase(iterator __first, iterator __last);
       ^~~~~
/opt/rh/devtoolset-7/root/usr/include/c++/7/bits/basic_string.h:4512:7: note:   no known conversion for argument 1 from '__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >' to 'std::basic_string<char>::iterator {aka __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >}'

As far as I can tell, the wrong libstdc++ ABI is being selected. This example compiles fine on Ubuntu 16. What's going on?