Use cmake cache variables to customize build settings #465
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Use cache variables in CMakeLists.txt to customize build settings.
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Hi.
I want to use IXWebSocket library with C++17 project but it seems that IXWebSocket can be built only for C++11.
Thus I modified CMakeLists.txt to use cache variables to enable customizing build settings outside of the file.
(And fixed CXX_STANDARD_REQUIRED usage. It should be CMAKE_CXX_STANDARD_REQUIRED because CXX_STANDARD_REQUIRED is a property.
https://cmake.org/cmake/help/latest/prop_tgt/CXX_STANDARD_REQUIRED.html
)
Thanks.