I tried to use gtest installed through conan, but ended up with an undefined reference linker error. This question is a more or less a follow up to this stackoverflow questi
I ended up having to add self.options['gtest'].shared = True in the project's conanfile.py to get around this. Previously it was set to false for some windows-related reasons that became non-relevant.
Try changing to shared libraries for gtest/gmock if, like me, you saw that the default settings were already libstdc++11 so changing the conan install args was not sufficient.