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/*
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]*;
};
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