I am working my way through the "CMake Cookbook" by Radovan Bast and Roberto Di Remigio and got to an example that required the Eigen C++ libraries. (chapter-02/recipe-06)
I downloaded the ".zip" for the Eigen libraries and unzipped it to an arbitrary location. Then I ran CMake on it (but I did not build or install it). After doing this, magically the example code was able to find it and the example built successfully even though I never told it where to look for the Eigen libraries. A detailed description of my experience is in this stack overflow post: https://stackoverflow.com/questions/54541261/cmake-find-package-command-on-a-package-that-was-not-installed-is-unexpectedly?noredirect=1#comment95884208_54541261 Can anyone explain to me how "find_package" is able to find the Eigen libraries even though they are just pasted into some arbitrary location that I never told the example project about? As far as I can tell from the documentation on "find_package" it should not work. Thanks, Tim
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