/*
  Hide all symbols from the standard library.

  This is a workaround for libstdc++ problems on redhat 6, which are caused
  by our INSTALL_DEBUG_TARGET cmake macro: we *link* with one .so library,
  but *run* with a different version.

  The installed mysqld-debug will not start because of:
  bin/mysqld-debug: symbol lookup error: undefined symbol: _ZNSs4backEv
  Running c++filt on that symbol, we get
  std::basic_string<char, std::char_traits<char>, std::allocator<char> >::back()

  Parts of the std C++ library are not found in /usr/lib64/libstdc++.so.6
  but must be linked from -lstdc++_nonshared.

  Try on RedHat 6:
  readelf -Ws /usr/lib64/libstdc++.so.6 | grep _ZNSs4backEv

  That symbol has a weak implementation in libprotobuf-lite-debug.so
  but is undefined in mysqld-debug, which means mysqld-debug will not
  run with libprotobuf-lite.so (the non-debug version).

  The solution is to add this version-script which explicitly makes
  all symbols from the standard library hidden. It is really only needed
  on RedHat 6/7, but we might as well use it on all Linuxes.

  https://itanium-cxx-abi.github.io/cxx-abi/abi.html#mangling

   <substitution> ::= St # ::std::
   <substitution> ::= Sa # ::std::allocator
   <substitution> ::= Sb # ::std::basic_string
   <substitution> ::= Ss # ::std::basic_string < char,
						 ::std::char_traits<char>,
						 ::std::allocator<char> >
   <substitution> ::= Si # ::std::basic_istream<char,  std::char_traits<char> >
   <substitution> ::= So # ::std::basic_ostream<char,  std::char_traits<char> >
   <substitution> ::= Sd # ::std::basic_iostream<char, std::char_traits<char> >
 */

MYSQL_HIDE_STD {
        local:
                _ZS[tabsiod]*;
                _ZNS[tabsiod]*;
                _ZNKS[tabsiod]*;
};