Topic time stamps:
0:00 - Intro
0:38 - Why functions in CMake?
1:52 - Motivate an example: print()
3:20 - Talk through print() ver. 1
5:36 - Built-in function parameter variables
7:35 - print() ver. 2 -- variadic version
8:34 - Macros vs. functions
10:43 - Browse OSPRay for more examples
12:49 - print_env()
14:18 - Wrap up
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