[CMake] CMake minimum required version

[Rolf Eike Beer]

Russell Wallace wrote:
> CMake asks me to specify a minimum required version. I'm writing a
> mostly fairly vanilla C++ program, primary target platforms are Linux
> and Windows, dependencies on Boost and GMP, using the glob facility,
                                                        ^^^^^^^^^^^^^

That sounds suspicious. From the documentation (cmake --help-command file):

       We do not recommend using GLOB to
       collect a list of source files from your source tree.  If no
       CMakeLists.txt file changes when a source is added or removed then the
       generated build system cannot know when to ask CMake to regenerate.

Eike
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