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* Cmake Revamp I needed to do a variety of things to ensure cxxopts worked well in my own project. I created a new cmake module to abstract a lot of the logic in the main CMakelists.txt, I think it really assists in the readability of the project. Consequently a lot of logic is now written in functions. I made a lot of the project options off by default unless the project is being built standalone. As a frequent consumer of cmake libraries this is a huge issue. Since examples, tests, installation, etc. aren't things I expect/desired by default when using libraries. Co-authored-by: Juan Ramos <juanr0911@gmail.com>
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Fixes #33. This PR uses cmake's interface library feature: An INTERFACE library target does not directly create build output, though it may have properties set on it and it may be installed, exported and imported. This makes it easier to include the header only library in a cmake project. After using add_subdirectory on the cxxopts directory, one simply needs to include cxxopts in their target_link_libraries, which will allow the user's target to inherit the properties of the cxxopts header library (see changes to example and test).
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* Add cxxopts.hpp as a source file to executable * Add msvc options for compiling * Add CXXOPTS_BUILD_EXAMPLES option to CMake build * This is helpful when using CMake's ExternalProject_add() * It is ON by default, but configurable from the command-line.
