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CCS/MSP430F2618: math.h: __INFINITY__ could not be resolved

Part Number: MSP430F2618

Tool/software: Code Composer Studio

I am trying to compare a floating point variable to infinity.

#include <math.h>

float f;

if (f==INFINITY) ...

works in code composer 6.1.1, but does not work in 7.4.0.

It actually worked for a while in CCS7, then started showing an error at some point, maybe after I changed the debugging settings to erase main and information memory instead of just erase main memory?

I changed it back, but it didn't help.

It probably isn't relevant, but the processor I'm using is MSP430F2618.

Am I missing something here?