[CMake] CheckSymbolExists / CheckCXXSymbolExists

[K. Ebrahimp.]

hi all

can anybody help me with a working example of

CheckSymbolExists / CheckCXXSymbolExists

I want to check if a some define exists in my  header file  example1.h of
clib1  and/or c++lib2

depending on the result I want to add/remove some tests

thanks in advance
Kevin
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