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* Add Separate CMake Target for C++20 Modules In the same vein as there is the `fmt::fmt-header-only`, `fmt::fmt` and `fmt::fmt_c` targets, I propose the addition of a new target `fmt::fmt-module` which will be for the compilation of the FMT_MODULE library option. The new target will have the properties requried for Compiling, Installing and using the C++20 functionality in CMake The `add_module_library` function is marked as deprecated as its functionality is superseded. Updated the logic for setting the FMT_USE_CMAKE_MODULE flag to check the versions for Ninja and MSVC according the CMAKE Documents and setting the FMT_MODULE flag based on this * Add Separate CMake Target for C++20 Modules In the same vein as there is the `fmt::fmt-header-only`, `fmt::fmt` and `fmt::fmt_c` targets, I propose the addition of a new target `fmt::fmt-module` which will be for the compilation of the FMT_MODULE library option. The new target will have the properties requried for Compiling, Installing and using the C++20 functionality in CMake Updated the logic for setting the FMT_USE_CMAKE_MODULE flag to check the versions for Ninja and MSVC according the CMAKE Documents and setting the FMT_MODULE flag based on this Fixed the test/CMakeLists.txt file which used the FMT_MODULE flag to separate the module and non-module library testing, in particular disableing the module version. The module testing still needs to be fixed, but the expected behavior of testing the non-modular version is working. --------- Co-authored-by: Mathew Benson <mathew@benson.co.ke> Co-authored-by: ClausKlein <claus.klein@arcormail.de>
