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chore: check CXX_STANDARD exists or not
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@ -4,7 +4,10 @@ project(toml11)
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include(CheckCXXCompilerFlag)
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if("${CMAKE_VERSION}" VERSION_GREATER 3.1)
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set(CMAKE_CXX_STANDARD 11)
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set(CMAKE_CXX_EXTENSIONS OFF)
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if(NOT DEFINED CMAKE_CXX_STANDARD)
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set(CMAKE_CXX_STANDARD 11)
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endif()
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set(CXX_STANDARD_REQUIRED ON)
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else()
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# Manually check for C++11 compiler flag.
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