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@space88man Hmm, i just read through https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html. Since, the one you define is passed first (prepended) followed by the project options (each target_compile_options appends to the last ones), the last -O wins the race.
I think since the default option of GCC is -O0 if none is passed, I think it's safe to remove it from the compiler-specific.cmake, so if one want to alter the optimization level, it's safe to do it via the above CFLAGS="-O2" method.
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