There was recent(ish) work to resolve an issue with ensuring executables are built with PIE enabled for Android, but it would appear that for other platforms, CMake might not be providing the required set of linker flags, missing out on -pie. The end result is that despite having POSITION_INDEPENDENT_CODE set to ON, executables might still be getting built with PIE not enabled.
Those who are familiar enough with the various compiler/linker/platform details may want to take a look at the following issue which ties together the information from a few related bug reports: https://gitlab.kitware.com/cmake/cmake/issues/14983 -- Craig Scott Melbourne, Australia https://crascit.com
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