In reviewing the archives, I see admonitions to avoid using different versions of libstdc++ in one binary (specifically libstcd++5 and libstdc++6, which results in the confusing-to-the-unsuspecting "/usr/bin/ld: warning: libstdc++.so.5, needed by some-undersupported-IRRATIONAL-INSTRUMENTS-third-party.so, may conflict with libstdc++.so.6" message). But, really, what is the basis for the warning? Is it that the binary may in one place use an object created by one library version and then in another place hand the object off to a member function in the other library version? I'm in a conundrum because I'm dealing with various third-parties' software; I can't get access to everything I need to make them all play well together. But, I'm hoping it's not so bad--in my case, the C++ code in the third-party software requiring the older library is disjoint from every other bit of C++ code in the process; there is a strict C calling-convention/pass-only-intrinsic-data-types "firewall" between the poorly supported third-party library and the rest of the C++ code in the process. If I have such a firewall, can I safely ignore the ominous warning from ld? Thanks, Jeff -- View this message in context: http://www.nabble.com/risk-of-mixing-libstdc%2B%2B-versions-in-one-executable-tp19116549p19116549.html Sent from the gcc - Help mailing list archive at Nabble.com.