[CMake] Error if CMAKE_SYSTEM_NAME is placed wrongly

[Frank Brütting]

Hi,

when I place set(CMAKE_SYSTEM_NAME Generic) after cmake_minimum_required()
and project() and set(VERSION_MAYOR/MINOR), incremental „make“s still work,
but once the build directory is cleared and „cmake ..“ is invoked, „make“
always leads to the error „avr-gcc: error: unrecognized command line option
'-rdynamic'“.

Would be nice if there's a way to prevent this situation. I don't know if
it really is a bug or if „cmake ..“ always has to be invoked after editing
CMakeLists.txt, but this is a really nasty situation for a cmake beginner.

Best regards,
Frank
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