getting the value of compile-time expressions in C [duplicate]

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• GCC dump preprocessor defines 5 answers

Is there any way to have the C compiler (XC16 in my case, which is based on gcc) dump the results of compile-time expressions?

We have lots of #defines like

#define FOO 37.6
#define FOO_BASE 0.035
#define FOO_FIXEDPOINT (int16_t)(FOO/FOO_BASE)

and I would like to know the actual numbers that the compiler reduces these expressions to.

Note that this is NOT the same thing as wanting to know what the preprocessor outputs; the preprocessor does not compute math, it only substitutes in things. If I look at the preprocessor output, I get (effectively)

#define FOO_FIXEDPOINT (int16_t)(37.6/0.035)

and it's the compiler, not the preprocessor, which figures out a value.