The math() command

CMake also supports some simple arithmetical operations. See the online documentation for full details:

https://cmake.org/cmake/help/latest/command/math.html

To evaluate a mathematical expression and store it in the <out> variable as the string in an optional <format> (HEXADECIMAL or DECIMAL), use the following signature:

math(EXPR <out> "<expression>" [OUTPUT_FORMAT <format>])

The <expression> value is a string that supports operators present in C code (they have the same meaning here):

• Arithmetical: +, -, *, /, and % modulo division
• Bitwise: | or, & and, ^ xor, ~ not, << shift left, and >> shift right
• Parenthesis (...)

Constant values can be provided in decimal or hexadecimal format.