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The symbol M_PI is breaking the build on Windows. The _USE_MATH_DEFINES macro enables M_PI and other math constants on Windows. (I'm guessing this is more idomatic than the old trick of using PI=acos(-1.0).) https://learn.microsoft.com/en-us/cpp/c-runtime-library/math-constants?view=msvc-170 Co-authored-by: BradPepersAMD <Brad.Pepers@amd.com>