CMakeLists: Force C++20 on MSVC due to conflicts with C++23 modules
The latest version of MSVC STL brings C++23 standard library modules, which conflict with precompiled headers. Disabling with /experimental:module- has no effect, so force C++20 in the meantime while we wait for module support in other compilers.
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@ -255,7 +255,7 @@ endif()
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# boost asio's concept usage doesn't play nicely with some compilers yet.
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add_definitions(-DBOOST_ASIO_DISABLE_CONCEPTS)
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if (MSVC)
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add_compile_options($<$<COMPILE_LANGUAGE:CXX>:/std:c++latest>)
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add_compile_options($<$<COMPILE_LANGUAGE:CXX>:/std:c++20>)
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# boost still makes use of deprecated result_of.
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add_definitions(-D_HAS_DEPRECATED_RESULT_OF)
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@ -43,7 +43,7 @@ if (MSVC)
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/Zo
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/permissive-
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/EHsc
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/std:c++latest
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/std:c++20
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/utf-8
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/volatile:iso
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/Zc:externConstexpr
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@ -51,8 +51,10 @@ if (MSVC)
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/Zc:throwingNew
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/GT
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# Modules
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/experimental:module- # Disable module support explicitly due to conflicts with precompiled headers
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# External headers diagnostics
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/experimental:external # Enables the external headers options. This option isn't required in Visual Studio 2019 version 16.10 and later
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/external:anglebrackets # Treats all headers included by #include <header>, where the header file is enclosed in angle brackets (< >), as external headers
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/external:W0 # Sets the default warning level to 0 for external headers, effectively turning off warnings for external headers
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