math
Mathematical expressions.
math(EXPR <output variable> <math expression>)
EXPR
evaluates mathematical expression and returns result in the output variable. Example mathematical expression is ‘5 * ( 10 + 13 )’. Supported operators are + - * / % | & ^ ~ << >> * / %. They have the same meaning as they do in C code.
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https://cmake.org/cmake/help/v3.5/command/math.html