c++ conditional include or compile

i'm studying about arduino but i want to test my code by g++ compiler before adjust to arduino.

it is easy way to test if i make two same code but it makes me tiresome.

so i want to do conditional compile.

here is my code

CustomMath.cpp

#include "CustomMath.h" #if defined(_CPP_) #include <cmath> #endif #if defined(_ARDUINO_) #include "math.h" #endif float CustomMath::cSin(int degree) { float value = 2;//check for this code is work right float radian = cDegreeToRadian(degree); #if defined(_CPP_) value = sin(radian); #elif defined(_ARDUINO_) value = sin(radian); #endif return value; } 

and here is main code

#define _CPP_ #include <iostream> #include "CustomMath.h" using namespace std; using namespace CustomMath;//CustomMath.h ic braced by namespace CustomMath int main() { cout << "sin : " << cSin(30) << endl; } 

and output is

sin : 2 <<-- this means conditional compile is not work 

i think _CPP__ is defined after CustomMath compiled. how can i do conditial compile? or is there something wrong?

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i just add ComileCondition.h

#define _CPP_ 

and i just change this part when i adjust on arduino