<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">> <span class="Apple-style-span" style="font-family: monospace; white-space: pre; ">run() is in generated code that we compile and link to the system as a shared library.</span><div><br></div><div><br></div><div>Is the generated code in the shared library compiled and linked to the system and against libc++ by any chance?</div><div><br></div><div><br></div><div>If it is, then your gcc7 code is not linked against libc++, but against /opt/local/bin/libstdc++</div><div><br></div><div>and your c++ standard libs and c++ abis would be different.</div><div><br></div><div>Would be surprising if it worked at all, I would think.</div><div><br></div><div>If I'm following your issue correctly.</div><div><br></div><div>K</div><div><br></div><div><br></div></body></html>