Simplify usage of CPM_SOURCE_CACHE #13344
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Simplify the usage of CPM's CPM_SOURCE_CACHE variable
Description
QGroundControl provides its own cache
QGC_CPM_SOURCE_CACHEvariable, which shadowsCPM_SOURCE_CACHE. However, this causes the environment variable ofCPM_SOURCE_CACHEto be ignored, which is some of us' preferred way to store settings for CMake etc. It'd be nice if the project did away with this extra layer and let its consumers interact with CPM's variables directly.Test Steps
CPM_SOURCE_CACHE="$HOME/.cache/CPM" cmake -B build.build/cpm_modulesdirectory.Checklist:
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