CMake Error at CMakeLists.txt:35 (add_subdirectory) about utfcpp HOT 4 CLOSED

You should either disable the build of tests using -DUTF8_TESTS=off or run git submodule update --init at the root of the project to clone googletest's repository into extern/gtest.

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The zip does not contain the google test library. It's really intended for CI runs only.

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I would expect that googletest is included in the zip too or downloaded automatically, other libraries contain everything to build too or download on demand e.g. googlebenchmark https://github.com/google/benchmark that adds googletest on demand with cmake ExternalProject_Add .

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@blonder : including the sources of a third party in a project is, in my opinion, not a good idea for several reasons (build systems' incompatibility, forking prevent you from getting update, new features and bug fixes easily, ...).

Using a package manager to pull the dependencies is a preferable approach. C++ does not offer an official one yet. I would advise you to have a look at Conan.

git-submodule has a good reason to exist for big projects. That allows to add modularity to the project and also avoid to hit Git's performance issues when you have millions of files. This approach has an important drawback, it only works if the build systems of the projects are the same (unless you write an adapter yourself, good luck with that).

ExternalProject_Add is not a good idea too. CMake is a build system, not a package manager. People want to do everything with it, I think it's an error.

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