Undefined reference to "sq"

[tvnaidu]

I am doing small c prog using math, I wanted to square a value, when I do "sq((float)val1)", I am getting undefined reference. also I am using 'sqrt', I am able to pass compile for that by passing "-lm" and include "math.h", how to fix 'sq' issue?. thanks.

[mac11]

The undefined reference error probably means the linker doesn't have the function to link. I think more details are needed about your project.

I'm not aware of any standard 'sq()' function, where is it defined? Is it some code you wrote, in a library you have somewhere, something else?

[tvnaidu]

Thanks first. I got sample prog from net to calculate RMS value, but I got sqrt and sq as undefined errors, I fixed sqrt by including math.h and pass '-lm', but sq still undefiend.

[Banfa]

sq is not a standard function. Nor is there a standard function to squaring a value that I am aware of since it is a relatively simple operation; for any basic integer or floating point type T

T square;
T value = <someValue>;

square = value * value;

The maths library only contains implementations for non-trivial functions, for example square root, cos, log.