Comment 47 for bug 2246

There are no details here about how it crashes, backtraces etc.
One possible thing could be that some C++ symbols really ought to be always
exported.
Say if you hide using version script
_ZZN9__gnu_cxx20__common_pool_policyINS_6__poolELb1EE11_S_get_poolEvE7_S_pool
and
_ZGVZN9__gnu_cxx20__common_pool_policyINS_6__poolELb1EE11_S_get_poolEvE7_S_pool
and then allocate some object using STL allocator in one shared library and
destroy it in a different library, you lose, as here libstdc++ relies on ODR.
Similarly with other _S_pool variable objects. Also, if you use RTTI, libstdc++
uses simple pointer comparison for RTTI checks; see
/usr/include/c++/4.0*/typeinfo header.
If you hide the typeinfo symbols (I think these are _ZTI* ones) and try to use
RTTI in one shared library on an object created in another shared library, RTTI
might give wrong answers.