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Take this code for example:
#ifdef THIS_IS_NOT_DEFINED
//lots of code here...
#endif
Say that the “lots of code” could potentially add a megabyte to the resulting executable. If THIS_IS_NOT_DEFINED is indeed not defined, then will the compiler still write all the contained code to the .exe, or not? Do most compilers follow a similar procedure for this?
The C preprocessor processes the #ifdef. If it is not defined, then the compiler itself doesn’t even see the code, so there’s no way for it to get into the .exe.