Math operations in cmake

CMake has a math command to assign a variable with the evaluation of a mathematical expression. For example the following cmake code sets the variable v to the value "7"

math(EXPR v "2 * 3 + 1")

The following prints the numbers from 0 to 9

set(i "0")
while(i LESS "10")
    math(EXPR i "${i} + 1")
    message("i = ${i}")
endwhile()

Numerical comparisons

The cmake documentation on the if command provides information on the syntax for performing numerical comparisons.

Operation	Keyword
<	LESS
>	GREATER
=	EQUAL
≤	LESS_EQUAL
≥	GREATER_EQUAL

Boolean operators

The boolean operators are: AND, OR and NOT.