I found the reason of such undefined symbol error. In CMakeFiles/tvm_runtime.dir/link.txt, it use `/usr/bin/gcc` rather than `/usr/bin/c++`. So the libtvm_runtime.so cannot find libstdc++.so to link. I manually modify link.txt, and make again. It worked. But I wonder why link.txt use gcc instead of c++, and how the link.txt generated. What do I need to modify to generate the correct link.txt? Thanks
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