Fetch NLopt when not available (and fix compiler warnings) - #74
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Hi,
This PR tries to solve a major issue with the package releases: the nlopt library is not available for RHEL, so those packages are not being built (and we are reminded of it every day by the buildfarm).
When the package is not available in the system (when
find_packagefails), it is downloaded at build time and compiled via CMake'sFetchContent. The prefered option is still getting the package viafind_package, but this allows using the library when not available.Additionally, I fixed some compiler warnings about using uninitialized variables (parameters) and a couple of unused variables.