librados2 from Ubuntu 18 is incompatible with newer libstdc++ due to containing duplicate symbols

[Yale Zhang]

Ubuntu developers,
I'm using some early stage commercial software which requires installing
libstdc++ from GCC 11 on Ubuntu 18 while still using the headers from GCC
7.5. My understanding is newer libstdc++6.so is compatible with older
headers.

This setup works pretty well, but once you link to librados2.so, even a
simple cout statement fails. The reason is because librados2 exports many
functions that should only be in libstdc++6. Those will take
precedence over the ones from libstdc++6 and cause incompatibilities.
Appreciate if you can fix that.

Thanks,
-Yale
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