Fix compilation when using CMake 3.26.1 and pybind11 2.4.3 (for example on Ubuntu 20.04 GitHub Actions image) #643
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GiulioRomualdi
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Apr 2, 2023
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Fix #636 .
This PR fixes an issue when using CMake 3.26.1 (so a quite recent CMake) with pybind11 2.4.3 (quite an old version).
Basically, the problem is that the old version of pybind11 explicitly sets
-std=c++14as compilation option, and this overrides the-std=c++17option that should be used instead (see https://github.com/pybind/pybind11/blob/v2.4.3/tools/pybind11Tools.cmake#L21 and https://github.com/pybind/pybind11/blob/v2.4.3/tools/pybind11Tools.cmake#L21). By explicitingly setting theCMAKE_CXX_STANDARDoption, we make sure that pybind11 does not set any additional option.